For more than 50 years, lactate profile testing has been a central tool in endurance training.
Graded exercise tests with incremental increases in speed or power, blood lactate measurements at each stage, and the resulting lactate curve are deeply embedded in the way endurance performance is assessed.
The age of this concept alone does not make it wrong. But…
Newton’s theory of gravity is several centuries old and still correct. Age is not the issue. The issue is how a concept is used — and whether its interpretation has kept pace with advances in science.
For decades, lactate curves have offered something highly attractive to coaches and practitioners: a methodology that appears to provide an objective assessment of endurance performance.
A lactate profile curve provides a speed or power at anaerobic threshold — commonly used as a proxy for maximal lactate steady state — which is then used to create intensity zones for training [1,2].
Curves from the same or different athletes can be compared over time, and a shift of the curve is interpreted as a shift in endurance performance. Lactate profile curves seem to summarise endurance capacity in a straightforward and widely accepted test methodology.
Over time, an implicit belief has emerged from this practice: that the position and shape of the lactate curve reflect aerobic performance itself.
This belief is rarely stated explicitly, but it quietly underpins how lactate data are interpreted. As long as lactate remains low and stable, metabolism is assumed to be aerobic. When lactate begins to rise sharply, an “anaerobic” contribution is assumed to dominate. The power or speed at this transition — often labelled an anaerobic threshold — is therefore interpreted as a marker of aerobic endurance performance, or more precisely “the highest intensity which can be covered aerobically without the accumulation of lactate” [1].
In this logic, the curve becomes the performance. A right-shifted lactate curve is taken to indicate improved endurance and aerobic capacity, as higher speed or power can be sustained without (anaerobic) lactate accumulation. The threshold becomes a proxy for how “endurance-trained” an athlete is.
This reasoning did not emerge by accident. It is rooted in an outdated view of metabolism in which lactate was considered a by-product of anaerobic metabolism occurring when oxygen supply was insufficient [3]. If lactate appeared only under oxygen-limited conditions, its rise would naturally signal the limit of aerobic performance.
That view shaped the interpretation of lactate curves for decades — and it still strongly influences how lactate testing is used today.
If you’re more interested in watching these concepts explained step by step, Sebastian Weber goes deeper into the same ideas in this webinar. He shows why conventional lactate curve interpretation falls short — and how the very same tests can be used to extract VLamax, VO₂max, substrate utilization, and comprehensive metabolic insights, without additional testing, equipment, or time.
Continue reading below for the full explanation.
If lactate profile curves truly reflect aerobic endurance performance, they should behave accordingly.
However, several observations challenge this assumption.
A fundamental one is the relationship between aerobic capacity and the position of the lactate curve. Aerobic performance is commonly associated with maximal oxygen uptake (VO₂max) and the capacity of the oxidative system. If lactate curves were a direct representation of aerobic endurance, athletes with comparable aerobic capacity should show comparable lactate curve positions.
In practice, they do not.
Athletes with similar VO₂max values can exhibit markedly different lactate profile curves. In some cases, these differences are substantial and are often interpreted as large differences in “aerobic endurance performance.” Yet the underlying aerobic capacity, as quantified by VO₂max, remains essentially the same.
Conversely, significant right-shifts of the lactate curve can be observed without meaningful changes in VO₂max. If aerobic capacity has not changed, improved aerobic performance cannot be the explanation.
This inconsistency becomes even more apparent when comparing athletes from different event specialisations. Historical data from elite runners show that lactate curves of 100 m, 400 m, 800 m, 1500 m, and marathon athletes differ profoundly. While it is tempting to explain this purely by differences in aerobic endurance, this explanation quickly breaks down.
The aerobic capacity of 800 m and 1500 m runners is not dramatically lower than that of marathon runners. In some cases, VO₂max values are comparable. Yet their lactate curves can be shifted far to the left. If lactate curve position were primarily a measure of aerobic performance, such discrepancies would be difficult to justify.
These differences point toward an alternative explanation: lactate curve position is not determined by aerobic capacity alone.
Another important performance determinant that is entirely absent from lactate profile testing, yet strongly influences the results, is economy and efficiency. In running, for example, a better running economy means lower energy demand and therefore lower oxygen uptake at a given speed.
Even if one accepts the idea that an inflection point in lactate concentration marks aerobic capacity, a closer look reveals a problem: the inflection point refers to a speed or power output on the x-axis of the lactate curve. Differences in economy mean that the oxygen uptake at this intensity can vary substantially between athletes, rendering a direct link between the inflection point and aerobic capacity questionable.
Body composition adds another frequently overlooked factor. Lactate concentration is measured in mmol·L⁻¹ — a ratio. The dilution space depends on total body water, which is influenced by muscle mass and fat mass. Changes in body composition — through diet, strength training, or seasonal adaptations — can alter measured lactate concentrations without any change in metabolic performance, thereby shifting the apparent position of the lactate curve.
And then there is the protocol.
Lactate profile curves are highly sensitive to testing protocols. Step duration, workload increments, and sport-specific testing conditions substantially influence measured lactate concentrations. Different protocols — particularly differences in stage duration — can produce different curves in the same athlete, even when physiological capacity has not changed.
This has two important consequences.
First, lactate curves obtained with different protocols are not directly comparable.
Second, any threshold concept or method used to estimate MLSS must be matched to the specific protocol employed.
For example, the well-known 4 mmol·L⁻¹ threshold was validated only in treadmill running tests using five-minute stages with short recovery intervals. Deviations from these conditions alter the lactate curve and render a fixed threshold concept invalid.
Taken together, these observations reveal a core problem. Lactate curves are expected to answer a question they are not designed to answer. Even if the protocol is standardised and the threshold concept is properly matched, fundamental interpretational issues remain unresolved.
If curve position can change without changes in aerobic capacity; if large differences appear between athletes with similar aerobic performance; and if economy and body composition substantially alter the curve, then lactate profile curves may not be the robust tool they are often assumed to be for assessing endurance performance and guiding training decisions.
Something does not add up.
To understand why lactate profile curves behave the way they do, it is necessary to step back from traditional sport-science interpretations and look at lactate from the perspective of modern biomedical sciences.
Much of the conceptual framework still used in lactate testing originated in the 1970s and 1980s, when lactate was widely considered a waste product of anaerobic metabolism [3].
Since then, the understanding of lactate metabolism has fundamentally changed.
Decades of research in biochemistry, physiology, and cellular metabolism have established that lactate is not a waste product.
Lactate is continuously produced — even at rest and at low exercise intensities — and, crucially, even under optimal oxygen availability [4–6]. At the same time, lactate is continuously oxidised as a fuel, primarily within working muscle.
This concept is often referred to as the lactate shuttle [4,5]. Glycolysis produces lactate, which is transported and oxidised within mitochondria, thereby linking glycolytic and oxidative metabolism. Lactate is therefore not a sign that aerobic metabolism has failed; it is one of the substrates aerobic metabolism actively uses.
From this perspective, a crucial implication follows.
Lactate concentration does not indicate whether metabolism is aerobic or anaerobic. Instead, lactate concentration reflects the balance between two concurrent processes:
Lactate concentration = lactate production − lactate clearance [6,7]
This is not a conceptual model or theoretical assumption. It is a quantitative, physiologically established relationship.
Lactate production is driven by glycolytic flux. Lactate clearance is closely linked to oxidative metabolism and oxygen uptake. Both processes occur simultaneously across all exercise intensities. Changes in lactate concentration therefore reflect changes in the balance between production and oxidation, not the presence or absence of oxygen.
At low intensities, lactate clearance can exceed production, resulting in stable or decreasing concentrations. As intensity increases, lactate production rises disproportionately and eventually exceeds clearance, leading to increasing lactate levels.
The key point is not that lactate rises.
The key point is why it rises.
Once lactate concentration is understood as an outcome, it can no longer be treated as a primary causal variable. It does not explain what limits performance or which physiological systems are adapting. It simply reflects where the system has arrived.
Using lactate concentration as a primary control variable in training is a subtle but fundamental mistake — one that is difficult to detect precisely because “everyone does it this way.”
Consider medicine. A physician does not treat fever by targeting body temperature itself. Fever is an outcome — a signal that something else is occurring. Treatment targets the underlying cause, such as infection or inflammation. Temperature is monitored for assessment, not manipulated as the cure.
The same logic applies to engineering.
An engineer tasked with improving fuel efficiency does not optimise fuel consumption directly. Fuel consumption is an outcome of engine design, drivetrain efficiency, aerodynamics, rolling resistance, and many other factors. Engineers intervene at the level of these mechanisms and then observe fuel consumption to assess the result.
Yet in endurance training, lactate concentration is often treated as both assessment and control.
If lactate concentration is the outcome of multiple physiological processes — including oxidative capacity, glycolytic flux, substrate utilisation, economy, and body composition — then targeting lactate values alone provides no information about which of these processes should be changed.
Outcomes are informative.
But outcomes do not tell us what to change.
At this point, one thing is clear:
Lactate concentration is not useless.
But it is not what it has often been used for.
Instead of asking what a certain lactate value means, we can ask what creates it.
Lactate concentration results from two processes with fundamentally different physiological origins and kinetics: lactate production in glycolysis and lactate clearance via oxidative metabolism.
Across multiple workloads, the differing behaviours of these processes constrain the possible solutions, making it possible to infer how much lactate must be produced and oxidised to generate the observed concentrations.
In other words, lactate concentration can be decomposed into its components.
Glycolytic lactate production is a function of workload and maximal glycolytic flux (VLamax). Because workload is known during an incremental test, VLamax can be calculated.
The same logic applies to oxidative metabolism. Lactate clearance depends on oxygen uptake, which itself reflects workload and maximal aerobic capacity (VO₂max). As a result, lactate profile curves can be used to calculate both VLamax and VO₂max without additional testing and with gold-standard accuracy [8].
Because lactate is produced exclusively from carbohydrate metabolism, glycolytic flux is directly linked to carbohydrate utilisation. Knowing lactate production therefore provides information about carbohydrate oxidation. The remaining energy demand, not covered by carbohydrates, must be supplied by fat oxidation — allowing fat oxidation rates, FatMax, and maximal fat oxidation to be derived.
Together, this forms a coherent physiological chain described in the literature:
External performance determines energy demand.
Energy demand is met through oxidative and glycolytic metabolism.
Glycolytic flux determines lactate production.
Oxidative capacity determines lactate clearance.
The balance between both determines lactate concentration and substrate utilisation.
This structure is not speculative. It is grounded in established physiology and supported by decades of research. Interpreted this way, lactate profile testing moves from description toward understanding.
Lactate testing does not need to be abandoned.
But it does need to be used differently.
When lactate concentration is embedded in a causal framework, the curve stops being the answer and becomes the starting point for asking better questions.
This shift does not change what is measured.
It changes what becomes possible.
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(Tägerwilen, Switzerland, 8 March 2019) – INSCYD, the world’s most advanced software for performance analysis, and SEG Racing Academy partnered up for the next three years. Talent Support & Identification SEG Racing Academy is an U23 development team that competes at continental level with the aim of educating and developing riders to the next step.…
Zone 4 training, also known as threshold training, is used by the world’s best triathletes and marathon runners. But the true training effect of zone 4 training is not as straightforward as many coaches and athletes think. This article covers the science and practical applications of zone 4 training. Spread the knowledge! Share this article…
In our previous article, we showed how to find out whether your runner should increase or decrease VLamax. Now it’s time to answers the final question: how to increase or decrease VLamax and How to increase VO2max in the meantime. By Benjamin Tilus Download full article in PDF Ben Tilus, National and State Champion coach…
This case study is about a National Cross-Country (XC) Skier who is not able to keep up with his teammate during training and racing. Field observations and lactate measurements seem to indicate he needs to improve his aerobic energy system, but this turns out to be a false assumption. COMPARING 2 CROSS COUNTRY SKI ATHLETES:…
Dan Lorang talks about how he uses metabolic data of his athletes to create more efficient training programs: Performance Management at Team BORA-hansgrohe Assessing athletic performance in the field and in the lab Apply results to daily training programs Apply results to daily training programs The Presenter Dan Lorang is one of the most successful…
When you want to go fast, you need carbohydrates as a fuel. Once you start running out of carbs, you’ll automatically slow down …
Mountain biking is significantly different from road cycling – you can’t just use the same training prescription. Elite coach Janis Musins reveals how he transformed Martin Blums from a rank around 50 to an impressive 11th place on the World XC ranking, using INSCYD performance software. Spread the knowledge! Share this article with your fellow…
Whether you’re considering becoming a coach or are already an experienced coach, we honestly can’t imagine a better way to test our physiological software than by using it on yourself (as a coach) before using it on your athletes. That’s what coach Florian Heck, 28 years old from Tri2gether (Trier, Germany), did with INSCYD. INSCYD…
If you’re working with swimmers, you’re likely doing some kind of swimming performance testing on a regular basis?! (and if not you should consider starting it). Maybe you’re tracking swim times at set distances, using lactate strips poolside, or monitoring heart rate and RPE. Whatever your exact protocol, the goals are almost always the same:…
In this blog, Certified Sports Nutritionist Coach Sofi Marin (INSCYD user since 2017) explains how she translates INSCYD data into specific nutrition advice. After all, who knows better how to use INSCYD than an INSCYD user? Translating INSCYD insights into specific nutrition advice With INSCYD, I have clear and specific data to support and justify…
Here’s how lactate concentrations in training can help to control fat metabolism. We reveal the link between lactate and fat, talk about the lactate concentration at FatMax and explain why knowing an athlete’s lactate levels in training is crucial to control fat metabolism. BONUS: know your athlete’s lactate concentration without measuring it. The popularity of training at…
Werden ChatGPT und andere KI-Tools den menschliche Coach ersetzen? Hier sind 3 Möglichkeiten, wie man neue, innovative Technologien nutzen kann und sich gleichzeitig unersetzlich macht. Facebook Twitter LinkedIn Reddit Email Trainerwissen vs. ChatGPT Bevor wir uns mit den spezifischen Coaching-Qualitäten von ChatGPT befassen können, ist es wichtig zu verstehen, woher es sein Wissen bezieht. Laut…
Although running, cycling, triathlon – and the majority of other sports – are still performed outdoors, indoor training and (remote) indoor testing are both very popular. Even in the professional world, the digitalization of training software and performance analysis tools are common practice. But take two digital platforms (let’s say INSCYD and Zwift), blend them…
For years, Functional Threshold Power (FTP) has served as the default method for setting training intensities in endurance sports. Appealing for its simplicity, FTP is derived from a relatively easy field test—bypassing complex lab procedures. Over time, widely adopted training frameworks tied specific “zones” to percentages of this single metric. One such framework defines Zone…
In this webinar we are going to take a close look at using anaerobic threshold / FTP for prescribing training intensities. What might be the possible limitations and most common errors in using anaerobic threshold / FTP as the sole performance benchmark? Watch the webinar: Agenda: The physiological definition of anaerobic threshold Intensity in competition…
This article talks about the differences between a training platform like TrainingPeaks and INSCYD performance software. We also show how teams like Alpecin-Deceuninck combine both tools to prepare their pro athletes for key races. *Although we compare INSCYD with TrainingPeaks, the same is true for other training platforms like Today’s Plan, AZUM, etc. Prefer watching…
Olympic gold medal winners are physiological outliers per definition. But what truly sets these elite athletes apart from others? In this article we dive into the metabolic profile of Grace Brown, who won the female individual time trial in Paris. The 32.4km course of the individual time trial (ITT) was virtually flat. As Italian’s national…
This article shows how to reverse-engineer a swim season with a simple, field-proven lactate protocol (easy submax sets plus one all-out) already used by elite programs such as the Swedish and German Swimming Federations and USA Triathlon. We explain, at a coach-friendly level, how INSCYD models lactate production vs. clearance, accounts for distribution/kinetics, and derives…
The highest VO2max ever recorded is by Junior World Champion Oskar Svendsen. He scored a whopping 96.7 ml/min/kg. Could he beat a multiple Tour de France winner? A recent scientific study by Dr Reinout Van Schuylenbergh answers this question, using the INSCYD software. The results will surprise you. If you are coaching or testing athletes,…
The German Swimming Federation (Deutscher Schwimm-Verband, DSV) and INSCYD have announced the extension of their successful partnership, a collaboration that has already led to groundbreaking results for German swimming on the world stage. By combining physiology-driven insights with tailored training protocols, INSCYD’s software has been instrumental in shaping the Federation’s athletes for top-tier performance—and the…
Lactate accumulation & recovery Accumulation of lactate is associated with fatigue and time to exhaustion during hard exercise. The time an athlete needs to recover from such an accumulation and the intensity he or she can handle during this are crucial for success in some sports like cycling and football. Furthermore knowledge about accumulation and…
Together with former professional cyclist and INSCYD user Peter Pouly, we talk about the future of cycling training and how that affects endurance coaches and their business. Peter is a former professional cyclist (5x National Champion Cross-Country Mountain Bike, 5x winner Haute Route Alps, 1x winner La Marmotte) and now works as a Directeur Sportif for…
Sebastian Weber reently gave 2-day workshop in Munich about Energy metabolism diagnostics – and how to apply it in training. In attendance were national ski coaches looking to expanding their knowledge. The event was organized by INSCYD partner, the German Ski Association. Do you want to have an inside look at what the national coaches…
In this partner webinar with Azum, Sebastian Weber talks about creating efficient and effective training plans. Theoretical basics are linked with application examples from practice. Agenda Differentiating primary and secondary goals Timing, timing, timing: how long, how often, how many repetitions? Periodization & Structure: introduction use of macro-nutrients to make informed decisions about training &…
Leistungsdiagnostik 4.0 Wir wollen in allen Bereichen des Trainings auf dem neuesten Stand der Technik sein. Wenn es aber um die Ausdauerleistung geht arbeiten die meisten Trainer mit herkömmlichen Laktatstufentests. Einer mehr als 30 Jahre alten Methodik. Wie passt das zusammen? Dabei ist der Fortschritt längst in der Ausdauerdiagnostik angekommen. Leistungsdiagnostik findet heute da statt…
You can have a VO2max well above 70ml/min/kg, but still perform below expectations. You could even find yourself having a low anaerobic threshold (or FTP) and a low FatMax. That is because a high VO2max alone is not good enough. Here’s an example of a professional cyclist. By Sebastian Weber Swedish cyclist Hannes Bergström Frisk…
Ask Me Anything with Sebastian Weber: Live Q&A for Coaches & Labs arrow-icon-down Book Free demo arrow-icon-down download E-book About the Webinar: Eexclusive ‘Ask Me Anything’ session with Sebastian Weber, the founder of INSCYD and a world-renowned sports scientist. In this interactive session, Sebastian will answer any questions you have and provide valuable insights on…
(Tägerwilen, Switzerland, 2nd September 2019) –Double Olympian Brendan Reilly joins INSCYD to develop partnerships with coaches and athletes worldwide INSCYD — the world’s most advanced software for performance analysis — has announced the appointment of double Olympian Brendan Reilly as its new Partnerships Manager. Reilly, who competed at Olympic level in high jumping for over…
VLamax: Elite Coaches Secret Weapon Are you a cyclist looking to sprint faster than Wout van Aert? Or a triathlete dreaming of racing with Jan Frodeno at the next Ironman World Championships? These may be hard goals, but a good way to start working towards them is to understand a very important metric of human…
VO2max intervals are a type of HIIT training that specifically aim to improve aerobic power (VO2max). Although many workouts increase VO2max aerobic power, VO2max intervals are often considered to last about 5 minutes. But why? Here’s how to create individually tailored VO2max intervals that work best for you. Spread the knowledge! Share this article with…
Improving running economy is probably the most efficient way to shave off minutes from your 10k or (half) marathon time. At the same time, it’s an overlooked metric that is often wrongly measured. That’s why it’s time for a change! This comprehensive guide covers everything you need to know about running economy (RE): from theory…
In this webinar, we share which performance metrics make the difference in swimming, how you can measure those and how you put them into practice. Watch the webinar: Agenda timestamps: [01:29] Physiological testing in swimming: which metrics are of interest? [02:40] VO2max – Maximum aerobic performance. How to test VO2max without measuring it during the…
Are you still using training zones based on a percentage of FTP, Anaerobic threshold or fixed lactate concentrations? Do you get the feeling that two athletes training in the same zone don’t show the same adaptation to the same training? If this sounds familiar then it is time for a change! https://youtu.be/hZELSARsJtA With INSCYD’s new…
This case study is about an 800 meter National Swimmer who is not able to keep up with her teammate during training and racing. Observations and lactate measurements seem to indicate she needs to improve her aerobic energy system, but this turns out to be a false assumption. Read the article and register for the…
Bernat Xamena after his sub-3h Marathon success Do you want to run a marathon in under three hours? Easy: you only need to run those 42.195 km (26.2 miles) at an average pace of 4:15 per km and smash it in 2 hours and 59 minutes. Of course, it’s not quite that simple: your body…
Can you compare indoor lab tests with outdoor field test? The comprehensive results of a complete physiological assessment can help you to plan your training sessions and nutrition more effectively. It’s a necessity for elite runners and it’s even a good idea for recreational runners that are training for a specific time in an upcoming…
Henrik Kraglund on his way to break the 7-hour mark at La Marmotte 2019 There are several badges of honour in the world of endurance sports. For some, it is running a marathon in less than three hours, or qualifying for the Ironman World Championships. For pure cyclists, on the other hand, it can be…
This webinar is about Training Zones and the new INSCYD Training Zone Builder (part 1). Watch the webinar: Agenda timestamps: [02:55] What are training zones and what are they used for: benefits and downsides [11:10] Examples of training zones in different sports and countries [19:40] Translating training zones to real life training: the challenges with…
Free Demo The 7 key takeaways you will get from 4-Day Hands-on Physiological Testing & Coach Education Camp If you are not sure if these camps are for you or if you just want some key takeaways summarized – we have you covered. Join our free webinar and learn 7 key takeaways from the upcoming…
INSCYD is known for its partnerships with national federations and professional teams. However, small-scale (one-man) coaching businesses and their amateur athletes can also significantly benefit from INSCYD. This article covers common reasons why (part-time) coaches are hesitant, but extremely successful once they start using INSCYD. Consider a typical athlete who trains slightly more than 5…
Over the past two decades, Functional Threshold Power (FTP) has become the cornerstone for determining training intensities and tracking performance progression in cycling, triathlon and endurance sports. At its core, FTP is an attempt to approximate the physiological phenomena of the maximal lactate steady state, which is usually derived from a lactate profile test. The…
Body composition in performance testing: stop ignoring it Body composition is highly important in athletic performance and performance testing. Although often ignored, body composition goes beyond weight and body fat. In lactate testing for instance, concentrations are expressed in mmol lactate per liter (mmol/L). But do you know which “liter” it is about? Let’s dive…
If you’re looking to run your best 5K race, National and State Champion coach Benjamin Tilus has a secret recipe for both beginners and professional runners. Follow these 3 steps to improve your performance and win your next race. Whether you’re a runner or a coach, this comprehensive guide to 5k race training is packed with valuable…
You know the protocol by heart. The cyclist clips in, settles in position and starts pedaling through an incremental test. You draw blood at each stage, track lactate levels, and chart the curve. Soon enough, you’ve got the classic profile: power vs. lactate concentration. From there, you estimate thresholds, prescribe training zones, and maybe even…
Triathlons are not won while swimming, but can easily be lost in the swim. By understanding your athlete’s physiological response, you learn how to tackle the swim and what to do in training. This boosts confidence and performance, which unlocks race benefits you and your athletes never knew existed. BONUS: Olympic Triathlon Paris use case.…
Team Sportforum has one mission: to become the best amateur cycling team in Germany. Head of Performance, Luke Derksen, shares how they use INSCYD for talent identification, progress monitoring, predicting future performances and deciding on race strategies. Image: INSCYD Partner Team Sportforum About Team Sportforum Our mission is to become the best amateur cycling team in…
From 7-Eleven to Motorola to Saturn to INSCYD. Norman Alvis – retired Pro, multi-national champion and world record holder – has turned INSCYD to go beyond… Norman Alvis at Motorola (1994) vs Norman Alvis now Norman lives in Colorado Springs where he set a US Hour Record late in his pro career, 1997. The distance…
DATE: 29 January | 7:00 PM CESt Journey to Paralympic Gold: USA Triathlon Coach Parker Spencer’s Strategy arrow-icon-down SEE INSCYD IN ACTION arrow-icon-down Download Free Guide About the Webinar: Success at the highest level requires more than just hard work—it demands precision, data, and a strategic approach. In this exclusive webinar, Coach Parker Spencer and…
Understanding VO2Max: What Is It and How It Affects Athlete Performance In the realm of endurance sports, understanding performance data and metrics is vital. A common question that emerges among athletes is “what’s your FTP?” or even more specific: “what is your power-to-weight ratio?”. However, both FTP and power-to-weight ratio are heavily dependent on a…
How many times have you looked at your power meter or heart rate monitor and wondered if you were going too far above your threshold? Although it is reasonable not to kill yourself ‘just because’ when you’re out training and racing, you might be surprised by how little you actually know about one of the…
Many INSCYD athletes and coaches qualified and prepared for IRONMAN Kona, Hawaii. In this article we bundle their tips and tricks. Spread the knowledge! Share this article with your fellow coaches and athletes. Click the share buttons below and inspire others on their journey to athletic excellence. Facebook Twitter LinkedIn Reddit Email Table of Contents…
In endurance training and competition— efforts can oscillate between high-intensity surges and low-intensity steady paces—an athlete’s ability to recover is a defining factor of repeated, high-quality performance. Whether you coach elite cyclists seeking to outlast the peloton in repeated breakaways or you lead a running club preparing for intervals, an informed approach to recovery during…
Here’s how to increase your fat combustion, be less dependent on precious carbohydrates and sustain a higher exercise intensity for a longer amount of time. These 3 tips talk about what to avoid in training, what (not) to eat and your overall long term training goal. PS you can also download the tips in PDF.…
In this post you learn 5 actionable steps to create a nutrition plan for training and racing. In fact, this is the exact process that partners like Alpecin-Deceuninck Cycling Team and the Belgium Triathlon Federation use to create a fueling plan. So if you want to know what and how much you should eat during training and…
“While everyone is obsessed with power data, INSCYD enables me to go beyond the superficial and understand my body better.” Cyclocross professional Eli Iserbyt shares what he learned from INSCYD and how he puts this into practice. Cyclocross professional Eli Iserbyt shares his INSCYD experience (photo: PhotopressBE) What triggers a 6x Belgian champion, 3x European…
With an INSCYD performance projection, you can show your athletes exactly how much their FTP (or any other parameter) changes when they increase their VO2max (or any other parameter) by say 5%. In our experience, that is exactly what motivates athletes to stick to a training program and retest more frequently. The performance projection (dashed…
Salenstein, Switzerland. June 3rd 2020 . INSCYD and Belgian Cycling have just signed four-year cooperation agreement. This partnership includes all divisions of the national cycling association, i.e., INSCYD will support the disciplines road cycling, mountain biking, cyclocross, BMX and track cycling in their pursuit of maximum performance. Expert education for coaches After a several months long…
Florian Wellbrock has continued to make waves in the swimming world with his recent achievements. He pulled away for an 18.7-second win in the Open Water 10K at the World Championships, showcasing his dominance in the sport. This win was Germany’s second in two 10K races in Fukuoka, marking a significant milestone for the country…
Many performance labs and coaches determine the anaerobic threshold based on a lactate concentration of 4 mmol/l during an incremental test. This article answers whether that is a valid method of assessing the anaerobic- or lactate threshold. Share this insightful article with athletes, coaches, and sports enthusiasts who can benefit from a deeper understanding of lactate…
Webinar X Creating individual physiology based Winter Training: From Data to Tailored Programs Prepare your athletes for success with winter training programs built from real physiological insights. Learn how to create tailored strategies that enhance off-season performance and drive results. Book A Free Demo Download Free E-Book About the Webinar: Winter is the perfect time…
The way training zones are determined and used hasn’t changed for decades, as if nothing happened in sport science lately. It’s time to throw them out of the window and start creating training zones that actually matter. Let’s start right away. TRAINING ZONES MOST COACHES USE – AND WHY IT’S TIME FOR A CHANGE Currently,…
James (39) is self-employed, working long hours and having to fit training in around his demanding physical job. His results had plateaued and he was finding it difficult to structure his training and balance his work/life commitments. As a result, he was struggling to improve his performance enough to warrant the time and energy necessary…
Aya Sinay has raced as a triathlete in IRONMAN Kona (Hawaii) twice and has been a successful triathlete coach for over 10 years. In this article, she shares 3 important tips that all triathlete coaches should read. Get ready to boost your athletes’ performance and your coaching business. Spread the knowledge! Share this article with…
Scientists and coaches are openly questioning the importance of the most well-known performance metric in endurance sports – VO2max. This article answers whether VO2max actually matters for your sport performance. Let’s dive right into it! Spread the knowledge! Share this article with your fellow coaches and athletes. Click the share buttons below and inspire others…
Velocity is a new performance-driven indoor cycling app that is designed to make cyclists faster by customizing their training to their physiology. To accomplish this, Velocity will leverage INSCYD’s proprietary software and comprehensive experience with elite athletes to provide riders with their unique metabolic profile. Readers may think of Zwift when hearing “indoor cycling app”,…
Some refer to zone 3 training as sweet spot training while others call it the grey zone. This article reveals what zone 3 training is and when you should or shouldn’t implement it into your endurance training program. Spread the knowledge! Share this article with your fellow coaches and athletes. Click the share buttons below…
Before we move into 2026, we want to look back at 2025 and summarize the year in one place. Here’s our 2025 wrap-up. In 2025, we focused on three things: access, scale, and confidence. That meant lowering the barrier to start testing, enabling assessments that can run at scale to grow your business 24/7, and…
Profile-Based Training: Tailoring Strategy to Athlete Profiles for Peak Results Case Study with National Champions Discover how to use data-driven, profile-based training to achieve peak performance. In this exclusive webinar, Ben Tilus, National and State Champion coach, will share real case studies of three national champions, revealing how to tailor training strategies based on individual…
Salim Mohammned getting an INSCYD test done by Jo Spindler Hard work will always beat talent (if talent is not trained). But if you’ve got a good set of genes and a strong work ethic, then you’re on the road to success.And that is true at any given phase in life. Just take Salim Mohammed,…
Salenstein, Switzerland./ Colorado Sprints, USA January 12th, 2021. Two of the most innovative and best performing companies have joined forces. The coaching company Carmichael Training Systems (CTS) brings on board the analysis software and the unique training science tool INSCYD to support their performance diagnostic work. Carmichael Training Systems is the premier destination for world-class…
In the 2023 Tour de France, Jasper Philipsen, riding for the INSCYD partner Alpecin-Deceuninck team, has demonstrated his sprinting prowess by securing four stage wins and six podium finishes. Philipsen’s victories don’t stop there. He has been utterly dominant in the 2023 Tour de France, especially in the bunch sprints. Here’s what it takes to…
In our previous article about Why the best track and field running coaches look beyond VO2max, we talked about the importance of knowing your athlete’s anaerobic power (VLamax). We showed that having a too low VLamax can easily cost you more than 5 seconds in an 800m race, while a too high VLamax can cost…
Iceland is often associated with geysers, volcanoes, cold water and a generally hostile landscape. Although it’s an island, you hardly think of Iceland as a swimming country or destination. But even this remote country, home to more than 300,000 inhabitants, has its own swimming federation – the Sundsamband Íslands, SSÍ. And its swimmers have already…
Improving your VO2max or increasing your threshold is a time consuming process that we talk about all the time. Not this time. In this article we share 3 training tips that will increase your triathlon performance in a time efficient manner. Are you looking to increase your triathlon performance? Or maybe even preparing yourself for…
Sometimes you need that extra advantage to win against your competitors. Sometimes you want to teach your team the intricacy of human physiology. And sometimes you just want to develop your squad and bring the youngsters to an elite level. It doesn’t matter what your goal is: INSCYD will help you to achieve it. The…
Many labs and coaches use lactate threshold graphs to measure progress in their athletes. However, when analyzing a lactate threshold chart, it’s important to know exactly which factors cause a shift in the lactate curve. After reading this article, you will understand why a right shift in the lactate curve can be a bad thing.…
Yes, power has advantages over speed and heart rate. But if you want to fully exploit its potential, you need to know how your running or cycling power is composed. How much power is coming from the aerobic vs the anaerobic energy system? And which fuel source contributes most to your power output? In this…
1) The metabolic origin of the anaerobic threshold. It is one of sports most used terms when it comes to endurance performance and the most important benchmark value. However, most people do not understand what it is and why it even exists. 2) Athlete performance profiling – beyond critical power testing. Critical power testing has…
Are you still using Jack Daniels’ running formula to determine athlete VO2? Are VO2max and anaerobic threshold the only metrics that you test for? Is your high VO2 athlete not winning all races? Then this article gives you the missing piece of the puzzle! Ben Tilus, National and State Champion coach in track and field…
So you received your metabolic test report and now wonder what you should work on to improve performance? Here’s how to discover potential room for improvement. We also show how you can calculate your ideal metabolic profile, depending on your goal. Afterwards you know exactly which metrics you should improve by how much. Spread the…
Want to reduce your VLamax so you burn less carbohydrates and increase your anaerobic threshold? Here are 5 training tips on how to decrease VLamax, talking about: training intensity, frequency and nutrition! PS you can also download the tips in PDF. Having a high VLamax will make you go faster in any sprint or attack*.…
You’ve been told you need to train 15, 18 or even 20 hours a week to qualify for the Ironman World Championships. You’ve been told that you had to want it so badly that you had to devote your entire life to it – let alone your family and professional commitments. And although yes, the task is…
This webinar will teach you how to use a holistic approach, utilising biomechanics, aerodynamics, training and nutrition to tremendously increase the performance of a triathlete in no time. Learn how to use real world biomechanical analysis, nutrition strategies and efficient training programs to maximize value of your coaching and bike fitting service. High Performance Expert…
How often should you do an exercise test? And maybe even more important: when should you do such a sports performance physiology test? Read it in this blog or click here to start listening to the podcast! In the Faster Podcast by FLO, Sebastian Weber talks about how often athletes should perform a metabolic test…
For more than 50 years, lactate profile testing has been a central tool in endurance training. Graded exercise tests with incremental increases in speed or power, blood lactate measurements at each stage, and the resulting lactate curve are deeply embedded in the way endurance performance is assessed. The age of this concept alone does not…
Diagnostics national coach Alexander Törpel (m.) works with fellow coaches Norbert Warnatzsch (l.) and Bernd Berkhahn (r.) at the Magdeburg federal base in Magdeburg. Digitization is also inevitable in the sport of swimming. In the field of sports science, it is now advancing particularly quickly in Germany since Dr. Alexander Törpel was appointed national coach…
INSCYD is the most advanced software tool to analyze physiological performance in athletes. INSCYD enables coaches to create highly individual and laser focused training programs. INSCYD gives you access to metrics otherwise only available to elite trainers and high-end institutes – such as the only tool to provide maximum glycolytic power (VLamax) for any kind…
You’ve done these lactate tests countless times. Your triathlete steps onto the treadmill or bike ergometer, and you guide them through a standardized incremental test. Blood lactate is taken at regular intervals, plotted meticulously, and out comes the familiar curve. Based on this, you make individual training recommendations—or compare results to previous tests to evaluate…
You’re already doing great work. By measuring VO2 max, you’re capturing the single most important metric in exercise physiology — the one that defines how much oxygen your client can process and how fit they truly are. That alone already sets your service apart from most gyms, coaches, labs and wellness programs. But as you…
A Functional Threshold Power (FTP) test is easy to perform, you only need a power meter. However, the insights you get from knowing your FTP are also limited. In this article we share what science has to say about FTP. We also introduce a very similar test protocol that gives you a full view of …
If you’ve worked with endurance athletes or run tests in a performance lab, you’ve likely come across Lactate Threshold 1 (LT1). In this article, we’ll delve into LT1 by unpacking the most common misconceptions and pitfalls about it and how to avoid them. Plus, don’t miss the video where Sebastian Weber explains these common mistakes…
IMPLEMENT INSCYD IN YOUR COACHING OR LAB BUSINESS: BOOST PERFORMANCE & GROWTH Discover the strategic advantages of implementing INSCYD into your business. We will walk you through the step-by-step integration process, share real-life examples of successful implementations, and provide actionable insights to maximize the benefits for your business. arrow-icon-down Get Free Demo Boost Earnings &…
Lift heavy is the number one tip that all female athletes in perimenopause and beyond can take on to stay strong and play to their best. Eat more protein is another. But what about those endurance goals that we love training for? How do you balance “going long” with doing strength and intensity? How do…
This webinar covers everything you need to know about swimming performance tests. From the test (protocol) itself, to the results and application. Alexander Törpel (Head of Diagnostics – German Swimming Federation) talks about the application of test results in training. You’ll get unique insights into the (longitudinal) development of performance metrics, of 2 Professional National…
THE PHYSIOLOGY BEHIND WINNING THE TOUR DE FRANCE: FROM DATA TO ACTION Exclusive webinar revealing the physiological secrets of Tour de France champions. Learn how to interpret and apply metabolic data to elevate training, boost performance, and develop winning talent. arrow-icon-down Learn more about INSCYD No More Guessing! Get a 360° Metabolic Profile of Athletes…
Not sure which software to use for analyzing lactate tests in your human performance lab? Checkout this comparison between Mesics (LC lactate) vs INSCYD, and decide which tool fits your lactate- and spiroergometry diagnostics lab best. To prevent confusion: Mesics is the company name. Their product is called Winlactat. Soon the product name will change…
Carbohydrate and fat combustion rates are among the most important features INSCYD can offer for runners, triathletes, and cyclists. Here’s why: While fat combustion rates are a valid marker to monitor training progress and set training intensity zones, carbohydrate combustion is crucial not only in training – but even more in a race. Carbohydrate storage…
High-Intensity Interval Training, or HIIT is a popular training method among athletes, including cyclists and runners, who want to make the most of their training time. In this article, we bring you the top 5 HIIT workouts for endurance athletes and guide you on choosing the training methods that suit your needs the best. By…
In this blog, Sport Scientist Dylan Lindsey shares how he coached Sarah Gigante towards the National TT Championships. He specifically dives into the benefits of using the Lactate: Recovery & Accumulation graph. Ready to learn how to become a national TT champion? Let’s start! Sarah Gigante: National TT Champion 2021 After a long hiatus from…
Over-under training is a type of interval training that alternates between intensities above the anaerobic threshold or FTP and those below it. The primary objective is to accumulate fatigue and lactate during the “over” interval and then efficiently clear it during the “under” interval. But how can coaches ensure they’re getting the intensities just right…
Want to race or run super long races, like the Race Across America, Cape Epic, Dirty Kanza or the Transcontinental? We’ve got you covered! As Certified Sports Nutritionist Coach Sofi Marin (INSCYD user since 2017) says: “During a 4-hour ride, you can underfuel and get away with it. However, during a 48-hour event, it’s essential…
Tabata workouts, a type of high-intensity interval training (HIIT), are named after Dr. Izumi Tabata, who compared the effects of these intervals to moderate-intensity endurance training in a scientific publication (1996). The original Tabata workout only takes 4 minutes and boosts your VO2max and anaerobic capacity. Check out our in-depth guide on understanding and improving your VO2max.…
Power output recorded in training and racing isn’t separated from the physiology of the athlete. In fact, the power output one sees on his powermeter are actually created by the physiology of the athlete. INSCYD’s Power-Performance Decoder (PPD) is the first tool ever to combine field- and lab data, it enables coaches to see,…
We are happy to announce that from now on, heart rate is integrated into our training zones. That means you can now describe a FatMax training zone – or any other training zone – based on heart rate. Image: INSCYD partner Triathlon Training Academy In the past, INSCYD training zones were described based on speed…
Muscle Glycogen and Exercise: all you need to know Glycogen is the most important energy substrate during exercise, especially at higher intensities. Since most races require such high intensities, glycogen is important to every athlete who wants to be strong, fast and become a winner. Regardless of the intensity at which you exercise, at some…
INSCYD College: Bridging the Gap Between Sports Science and Real-World Training https://inscyd.com/wp-content/uploads/2024/09/Vmake-AI-Thumbnail-6.mp4 The role of a coach has evolved, requiring a much wider skill set. Today’s coaches need to master communication, understand psychological aspects, develop tactics and pacing strategies, and even handle business development to market their services effectively. With so many areas of expertise…
The 2-day workshop combines theory and practice of muscular energy metabolism, explains how metabolic pathways create and influence athletic performance, and provides hands-on training in testing protocols, data analysis, and interpretation across different athlete profiles.
