Sottas.info – Sports Science and Performance Data

Sports Science and Performance Data: What We Track, Test, and Question

We remember when the word “sports science” meant a stopwatch, a notebook, and a coach’s gut feeling. These days, the same data streams that once lived only in elite labs at the Australian Institute of Sport are turning up in suburban footy clubs, school rowing sheds, and the local parkrun. A teenager’s smartwatch logs heart rate variability before a state carnival. An NRL rookie wears a GPS unit at training and gets a wellness survey on his phone before breakfast. We built Sottas.info because this flood of athlete data is genuinely useful — and genuinely easy to misuse. Our aim is to explain what the numbers mean, where they come from, and when we should be sceptical of them. This page is our working overview of the sports science landscape in Australia: the athlete biological passport, altitude training, athlete monitoring, the tools we rate, and the ethical lines we think matter.

The Athlete Biological Passport: Reading Blood Markers Over Time

The athlete biological passport is one of the most interesting ideas in modern anti-doping, because it does not try to catch a drug in a sample. Instead, it watches the athlete’s own biology over months and years, looking for patterns that do not fit. In Australia, the passport is administered by Sport Integrity Australia, the national anti-doping organisation that took over the functions of the Australian Sports Anti-Doping Authority (ASADA) in 2020. Sport Integrity Australia works within the World Anti-Doping Agency (WADA) framework, and the passport itself is a WADA-operated model that national bodies feed into. If you have ever wondered why athletes are asked to give blood at seemingly random moments, sometimes far from competition, the passport is usually the reason.

How the Athlete Biological Passport Works

The core logic is simple: every athlete has a baseline, and that baseline is remarkably stable when nothing unusual is happening. The passport records selected biological variables over time and uses statistical models to define an individual’s expected range. When a new sample falls outside that range — or when a sequence of samples drifts in a suspicious direction — the software raises a flag. That flag is not automatically a doping violation. It triggers review by a panel of experts who consider the athlete’s history, illness, travel, altitude exposure, and other legitimate explanations. Only then might an anti-doping rule violation be pursued.

The passport has two modules. The haematological module tracks blood variables related to oxygen transport. The steroidal module tracks urinary steroid profiles. For endurance sport, the haematological module does most of the heavy lifting, because the classic forms of blood doping — transfusions and erythropoietin — leave fingerprints in red blood cell populations. The genius of the longitudinal approach is that it does not need to know which drug was used. It only needs to show that the athlete’s biology changed in a way that normal physiology does not explain.

We think it is worth being precise here, because the passport gets misrepresented in both directions. It is not a magic bullet, and it is not a sham. It is a probabilistic tool that shifts the burden of explanation onto the athlete in a carefully defined way, and it has survived legal challenge at the Court of Arbitration for Sport. For Australian athletes in Olympic and professional programs, it is simply part of the landscape.

Blood Markers We Watch: Haemoglobin, Haematocrit, Reticulocytes

Three markers dominate conversation about the haematological passport, and each tells a slightly different part of the story.

  • Haemoglobin (Hb): the oxygen-carrying protein inside red blood cells. Measured in grams per litre, it is the headline number for endurance capacity. A rise can mean altitude adaptation, illness recovery, or blood doping.
  • Haematocrit (Hct): the percentage of blood volume occupied by red cells. It moves with haemoglobin but is also sensitive to hydration status and plasma volume, which is why a single high reading means very little on its own.
  • Reticulocytes: immature red blood cells, expressed as a percentage of total red cells. A spike in reticulocytes suggests the bone marrow has been stimulated to produce new cells — exactly what erythropoietin does.

The real signal comes from the relationship between these markers. If haemoglobin and haematocrit rise while reticulocytes fall, that pattern is more consistent with a transfusion or with suppressed natural production than with altitude training, which typically produces a coordinated response. If reticulocytes spike and haemoglobin then climbs over the following weeks, that looks more like legitimate marrow stimulation. The passport model, known as the abnormal blood profile score, weighs these combinations rather than treating any single value as decisive.

We also keep an eye on the “off-score”, a composite that combines haemoglobin and reticulocyte percentage. It was designed to detect the signature of erythropoietin use and remains one of the most discussed derived variables in the field. Understanding it helps explain why athletes are asked for blood at particular times of year — the model needs samples in different training phases to build a credible baseline.

What Abnormal Passport Readings Actually Mean

An abnormal reading is a question, not an answer. In practice, the most common explanations we see discussed in the literature and in anti-doping casework are mundane: dehydration, recent illness, a hard block of altitude training, a change in training load, or simply the natural variability of blood. Elite athletes also present unusual physiology by definition. A world-class cross-country skier or rower may sit at haemoglobin values that would look alarming in a sedentary adult, and that is not evidence of wrongdoing.

When a flag is raised, the Athlete Passport Management Unit reviews the case and may request a targeted follow-up sample, additional information from the athlete, or an expert evaluation. If the pattern cannot be explained, the case can proceed as an anti-doping rule violation based on the passport itself, without a positive test for any specific substance. That is a significant legal development, and it is why athletes and their support teams take passport management seriously. It is also why we encourage readers to think of the passport as a monitoring system with a threshold, not a verdict machine.

Limits and Criticisms of the Biological Passport Model

We would be doing readers a disservice if we presented the passport as flawless. Several criticisms recur in the sports science literature and in athlete advocacy.

  1. Micro-dosing and short-acting substances can be timed to fall between samples, especially where testing frequency is low.
  2. Analytical and biological variability means the model must trade sensitivity against false positives, and both errors have costs.
  3. Sample collection logistics vary between countries and sports, so some athletes are monitored far more densely than others.
  4. Privacy and burden are real concerns for athletes who must disclose whereabouts and medical information to maintain their passport.
  5. Interpretation depends on expert judgement, which introduces human variability into what looks like a purely statistical process.

None of these points makes the passport useless. They make it a tool that works best alongside traditional testing, intelligence gathering, and athlete education. For our part, we find the passport conceptually elegant: it respects the fact that biology is individual, and it asks better questions than a single snapshot ever could.

Altitude Training and Hypoxic Exposure: What the Data Says

Altitude training is one of the oldest tricks in endurance sport, and also one of the most misunderstood. The appeal is obvious: if low oxygen makes the body produce more red blood cells, then spending time high up should improve oxygen delivery and therefore performance. The reality is more complicated, and the Australian Institute of Sport has run altitude training camps and hypoxic research programs for national teams precisely because the details matter enormously. Get the protocol wrong and you can spend three weeks uncomfortable, sleep-deprived, and slower than when you left.

Live High, Train Low: The Physiology Behind the Hype

The dominant model in modern practice is “live high, train low”. Athletes live at moderate altitude, typically 2000 to 2500 metres, to stimulate erythropoietin release and red blood cell production. They descend to lower altitude for quality training sessions, so that training intensity and muscle power are not compromised by hypoxia. The logic is to separate the adaptive stimulus from the performance-limiting effect. It sounds simple, and it took decades of trial and error to refine.

The physiological cascade runs roughly like this. Reduced oxygen availability is sensed by the kidneys, which release erythropoietin. Erythropoietin stimulates the bone marrow to produce reticulocytes, which mature into red blood cells over days to weeks. Total haemoglobin mass — the absolute amount of oxygen-carrying protein in the body — gradually increases. Meanwhile, plasma volume often decreases in the first days at altitude, which temporarily raises haemoglobin concentration without any increase in red cell mass. That distinction between concentration and mass is one of the most important things we try to communicate, because it explains why early blood tests at altitude can look impressive while actual oxygen-carrying capacity has barely changed.

Over three to four weeks of live high, train low, well-responders can gain roughly two to four percent in haemoglobin mass, which translates into meaningful endurance performance gains. The catch is that this response is highly individual, and the protocol demands discipline around sleep, hydration, iron status, and training intensity. Iron deficiency quietly sabotages many altitude camps, because the marrow cannot build red cells without adequate iron stores.

Altitude Tents and Hypoxic Chambers in Australian Sport

Australia is a flat continent with limited natural altitude, so athletes here rely heavily on simulated altitude. Altitude tents and hypoxic chambers let athletes sleep in a low-oxygen environment at home or at a training base. The Australian Institute of Sport has used these tools for national teams across endurance sports, and state institutes of sport and university labs operate their own systems. A typical setup uses nitrogen dilution or a hypoxic generator to hold a tent at a simulated 2500 to 3000 metres, with athletes sleeping there for six to ten hours a night over several weeks.

We have watched this technology mature from a niche curiosity into a standard part of the endurance calendar. The practical questions are always the same: how many hours per night, how many nights per week, what simulated altitude, and how do we verify that the athlete is actually being exposed to the intended dose? Carbon dioxide accumulation inside sealed tents is a real issue, and so is the temptation to crank the simulated altitude so high that sleep quality collapses. A well-run program monitors both the environment and the athlete’s response, and adjusts rather than simply pushing through.

Tracking EPO, Plasma Volume, and Haemoglobin Mass

If you want to know whether altitude work is doing anything, you need better measures than a single haemoglobin concentration. The modern approach combines several variables.

  • Erythropoietin: measured in serum or plasma, it rises within hours of hypoxic exposure and falls back as red cell mass expands. It is useful for confirming that the stimulus was real.
  • Plasma volume: often estimated using carbon monoxide rebreathing or dye dilution. It falls early at altitude, which inflates haemoglobin concentration and can mislead the unwary.
  • Haemoglobin mass: the gold-standard outcome measure, usually assessed by carbon monoxide rebreathing. It captures the actual increase in oxygen-carrying capacity, independent of plasma shifts.
  • Reticulocytes: a short-term marker of marrow activity that helps time when the adaptive response is peaking.

The carbon monoxide rebreathing method deserves a mention because it has become far more accessible. It involves breathing a small, controlled dose of carbon monoxide, which binds to haemoglobin, and then measuring the dilution to calculate total haemoglobin mass. Done properly, it is safe and highly reproducible. Done casually, it is neither. We think it is one of the most valuable measurements in endurance sport, and also one of the easiest to get wrong without proper training and equipment.

Who Responds to Altitude and Who Does Not

One of the most consistent findings in altitude research is that responders and non-responders are real, and you cannot reliably tell them apart in advance. Some athletes gain three or four percent in haemoglobin mass from a standard camp; others gain almost nothing. The reasons are not fully understood, but iron status, baseline haemoglobin mass, sleep quality, training load, and genetic factors all seem to play a role. Age and training history matter less than people assume.

This is where athlete monitoring earns its keep. If we are running a camp, we want pre-camp haemoglobin mass, iron studies, and a sleep baseline. During the camp, we want daily wellness, sleep duration, and training quality. After the camp, we want a repeat haemoglobin mass measurement at a consistent time point, plus performance data from a standard test. Without that structure, a camp becomes an expensive holiday with a story attached. With it, we can say something honest about whether the intervention worked for this athlete, at this time, in this program.

Athlete Monitoring: Load, Recovery, and Readiness Metrics

Athlete monitoring has exploded in Australian professional sport. Catapult GPS units are widely used for athlete monitoring in the AFL and NRL, and Cricket Australia and state institutes of sport collect heart rate variability and wellness data for workload management. The goal is not to surveil athletes for its own sake. It is to make better decisions about who trains hard, who backs off, and who needs a conversation. The challenge is that monitoring data is noisy, and noise invites overreaction.

External Load vs Internal Load: GPS and Session RPE

We find it useful to split load into two categories. External load is the work the athlete actually does: distance covered, high-speed running metres, accelerations, decelerations, jumps, and collisions. GPS and local positioning systems capture much of this, and in team sports they have become close to universal. Internal load is the physiological and perceptual response to that work: heart rate, oxygen consumption, and how hard the session felt. The two do not always move together, and that gap is informative.

Session rating of perceived exertion, usually called session RPE, is the simplest and most robust internal load measure we know. The athlete rates the session from one to ten, and you multiply by duration in minutes to get an arbitrary unit of load. It costs nothing, it works across almost every sport, and it captures things GPS cannot, like psychological stress and cumulative fatigue. When session RPE and GPS disagree, we get curious. A player who covered modest distance but rated the session as brutal may be carrying fatigue, illness, or personal stress that the tracking data missed.

Heart Rate Variability and Sleep as Recovery Markers

Heart rate variability, or HRV, measures the variation in time between heartbeats. Higher variability generally indicates a well-recovered, parasympathetic-dominant state; lower variability can indicate stress, fatigue, or incomplete recovery. It is appealing because it is non-invasive and can be measured in a minute each morning. It is also easy to over-interpret, because HRV is influenced by sleep, alcohol, illness, travel, caffeine, and measurement posture.

Sleep is the other pillar. Duration, efficiency, and timing all matter, and athletes in heavy training often sleep less than they should. Wearables and phone apps can estimate sleep stages, but the accuracy varies, and we treat stage data as indicative rather than diagnostic. What we trust most is a simple, consistent sleep duration log combined with how the athlete feels on waking. Cricket Australia and state institutes of sport have built HRV and wellness collection into their workload management systems precisely because these measures are cheap, repeatable, and useful when tracked over time rather than in isolation.

Wellness Questionnaires and Athlete Self-Reporting

Wellness questionnaires ask athletes to rate things like sleep quality, fatigue, soreness, mood, and stress, usually on a one-to-five or one-to-seven scale. They take under a minute, and they capture the athlete’s own experience of their body. We are strong advocates for them, with one caveat: athletes learn quickly what answers lead to easier sessions, so the data is only as honest as the culture around it. Anonymity is impossible in a small squad, but psychological safety is not. If athletes believe the data will be used to help them rather than punish them, self-reporting improves.

We also like to pair wellness data with objective measures. A player reporting poor sleep and high soreness alongside a drop in HRV and a spike in session RPE is telling a coherent story. A player reporting poor wellness with normal HRV and normal GPS output might just be having a bad week. The combination is what guides action.

Turning Monitoring Data into Coaching Decisions

Data does not make decisions. People do. The best monitoring programs we have seen share a few habits.

  1. They collect a small number of measures consistently, rather than a large number sporadically.
  2. They establish individual baselines and look at trends, not single points.
  3. They set thresholds in advance, so decisions are not made in the heat of a bad morning.
  4. They combine objective and subjective data before acting.
  5. They review whether the actions actually helped, and adjust the system accordingly.

We are also realistic about the limits. Monitoring can flag that something is wrong, but it rarely tells you what to do. A raised session RPE might mean the athlete needs a lighter day, a conversation, a blood test, or nothing at all. The value of the system is that it prompts the right question at the right time, and gives coaches a shared language for discussing load and recovery with athletes and medical staff.

Sports Science Tools, Labs, and Data Platforms We Rate

The Australian market for sports science tools is crowded and getting more so. We have tested, watched, and read about a lot of it. Below is our honest take on the categories that matter, with the caveat that the best tool is the one your staff will actually use consistently.

Wearables and Wearable Data Quality

Wearables have democratised athlete monitoring, and they have also produced a lot of bad data. The key question is not what a device measures but how well it measures it, and under what conditions. Optical heart rate sensors are convenient but degrade during high-intensity intervals and contact sport. Chest straps remain more accurate for training zones. Sleep staging from wrist accelerometry is approximate. Step counts and energy expenditure estimates are rough.

We rate WHOOP for its clean presentation of HRV, sleep, and strain, and we know many Australian athletes use it. We also caution that its recovery score is a proprietary composite, not a physiological measurement, and should be treated as one input among many. Firstbeat has a strong reputation for heart rate variability analysis and physiological modelling, and its methods are well documented in the research literature. Garmin and Polar devices offer solid raw data for athletes who want to do their own analysis. Our general advice: pick devices with published validation studies, use them consistently, and do not switch brands mid-season if you care about trends.

Force Plates, Timing Gates, and Vald Systems

Vald Performance force plates and timing systems are used across Australian professional sport and university labs, and for good reason. Force plates measure ground reaction forces during jumps, landings, and isometric tasks, giving objective data on neuromuscular readiness, asymmetry, and return-to-play progress. Timing gates measure sprint and change-of-direction performance with high reliability. Together they cover the physical qualities that matter most in team sports.

What we like about the Vald ecosystem is the integration between hardware and software, and the fact that the normative data is broad enough to be useful. What we caution against is over-testing. A weekly countermovement jump is informative. A daily battery of six tests is noise, and it eats into training time. We would rather see one or two well-chosen tests performed consistently than a comprehensive assessment performed sporadically.

Lab Networks and University Partnerships in Australia

Australia has a strong network of sports science labs and university programs. The Australian Institute of Sport and state institutes of sport operate high-performance facilities with altitude chambers, environmental chambers, physiology labs, and biomechanics suites. Universities including Victoria University, Edith Cowan, Deakin, Griffith, and the University of Technology Sydney run sport science programs with research-active staff and equipment that professional teams often access through partnerships.

For teams without in-house labs, these partnerships are the practical route to carbon monoxide rebreathing, lactate testing, VO2max assessment, and detailed biomechanics. We think the university sector is underused by community and semi-professional sport, and we would like to see more shared-access arrangements. The equipment exists. The expertise exists. The missing piece is often a relationship and a modest budget.

What We Would Actually Buy for a Team

If we were equipping a professional or semi-professional team from scratch, we would prioritise ruthlessly.

  • GPS or LPS units for external load, sized to the number of athletes who train simultaneously.
  • Chest-strap heart rate systems for internal load and training zone accuracy.
  • A session RPE and wellness platform, which can be as simple as a well-designed form and a spreadsheet.
  • One force plate and one set of timing gates, shared across the squad and used consistently.
  • Access to a university or institute lab for periodic deeper testing rather than buying everything in-house.

We would skip the flashiest wearables in year one. We would spend the money on staff training instead, because a well-trained practitioner with modest tools beats an untrained one with a laboratory. That is not a popular opinion in a market that sells hardware, but it is what the evidence and our experience suggest.

Evidence, Ethics, and the Limits of Performance Data

Sports science has a marketing problem. For every well-validated method, there are a dozen products promising marginal gains with thin evidence. We think the field needs more scepticism, not less enthusiasm, and that goes double when athlete data is involved. Privacy, consent, and the risk of over-testing are not abstract concerns. They shape whether athletes trust the systems built around them.

Separating Evidence from Marketing in Sports Science

We apply a few filters when we evaluate a claim. First, is there peer-reviewed research in a credible journal, or only a white paper from the company selling the product? Second, was the study conducted in athletes performing the relevant sport, or in untrained participants doing something unrelated? Third, is the effect size meaningful, or statistically significant but trivial? Fourth, has the finding been replicated by independent groups? Fifth, does the proposed mechanism make physiological sense?

A surprising amount of what gets sold as sports science fails at least two of these filters. Compression garments, certain recovery devices, and some supplement claims are the usual suspects. That does not mean everything is worthless. It means we should ask for evidence before we ask athletes to change their behaviour, spend their money, or wear a device every day.

Athlete Data Privacy and Consent

Athlete data is sensitive. Heart rate, sleep, menstrual cycle information, injury history, and psychological wellness responses are personal, and in Australia they fall under the Privacy Act and the Australian Privacy Principles. Sport Integrity Australia provides guidance on anti-doping related data, and broader privacy obligations apply to how clubs and institutes collect, store, and share athlete information. Consent should be informed, specific, and revocable. Athletes should know who sees their data, what it is used for, and what happens if they decline.

We are particularly concerned about the quiet normalisation of surveillance. A wellness questionnaire is not intrusive. A GPS unit that tracks an athlete’s location outside working hours is a different matter. Wearables that sync to a club dashboard can reveal sleep patterns, travel, and even illness. We think clubs should default to data minimisation: collect what you need, keep it for as long as it is useful, and be transparent about it. Athletes are people first, and their data deserves the same care as their bodies.

When More Data Makes Decisions Worse

There is a real phenomenon where additional information reduces decision quality. It happens when data is noisy, when measures are correlated, when thresholds are arbitrary, and when decision-makers lack the statistical training to interpret what they are seeing. In sport, it can look like a coach dropping a player because of one bad HRV reading, or a practitioner chasing a wearable score instead of watching the athlete move.

We have three rules of thumb. First, if a metric does not change a decision, stop collecting it. Second, if two metrics tell the same story, keep the cheaper or more reliable one. Third, if you cannot explain a metric to an athlete in plain language, you probably should not be using it to guide their training. Simplicity is not anti-intellectual. It is a defence against noise.

Our Editorial Standards at Sottas.info

We try to hold ourselves to the same standard we ask of the industry. That means citing primary research where possible, distinguishing between established findings and emerging ones, disclosing uncertainty, and avoiding hype. We do not accept payment for favourable coverage, and we do not present sponsored content as editorial. When we review a product, we say what it does well and where it falls short. When the evidence is thin, we say so.

We also try to keep the athlete in view. Performance data is about people who have chosen to push their bodies to unusual limits, and they deserve analysis that respects their intelligence and their privacy. If our coverage ever loses that thread, we want readers to tell us.

FAQ

What is the athlete biological passport and who runs it in Australia?

The athlete biological passport is a longitudinal monitoring approach that tracks biological markers over time to detect patterns consistent with doping. In Australia, it is administered by Sport Integrity Australia, the national anti-doping organisation that replaced ASADA in 2020, working within the WADA framework.

Does altitude training actually work for Australian athletes?

For many endurance athletes, yes, but the response is highly individual. Live high, train low protocols can increase haemoglobin mass by roughly two to four percent in responders over three to four weeks. Australia relies heavily on altitude tents and hypoxic chambers because natural altitude is limited, and the Australian Institute of Sport has run camps and research programs for national teams.

What is the difference between external and internal training load?

External load is the work performed, such as distance and high-speed running metres measured by GPS. Internal load is the body’s response, captured through heart rate, session RPE, and other physiological or perceptual measures. Both matter, and the gap between them is often the most useful signal.

Is heart rate variability reliable for athlete monitoring?

HRV is useful when measured consistently and interpreted against an individual baseline, but it is influenced by sleep, alcohol, illness, travel, and stress. Cricket Australia and state institutes of sport use HRV alongside wellness data for workload management rather than as a standalone decision tool.

What privacy rules apply to athlete data in Australia?

Athlete data is personal information under the Privacy Act and the Australian Privacy Principles, and Sport Integrity Australia provides additional guidance for anti-doping related data. Consent should be informed, specific, and revocable, and clubs should collect only what they genuinely need.

Sports science and athlete performance data are only useful when they are interpreted with context, scepticism, and respect for the athlete. A blood marker, a GPS trace, or a wellness score is a question, not an answer, and the quality of the answer depends on the people asking it. We will keep tracking the research, testing the tools, and questioning the claims as Australian sport continues to evolve. If that sounds like your kind of conversation, explore our ongoing Australian-focused coverage at Sottas.info and tell us what you think we should investigate next.

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