Three tests for two opposing qualities: which values count as world class, how often to measure — and why only the relation between curves gives the diagnosis.
Straight talk: a combined athlete who tracks only one number is measuring past the actual problem. Because two opposing qualities have to be developed at once, the information is not the single value — it is how two curves move relative to each other. Which is exactly why this sport's diagnostics rest on at least three building blocks: general explosiveness, sport-specific translation, and endurance economy.
How powerful that is shows in the documented development of an Olympic champion: his vertical velocity in jump imitation rose by 0.31 metres per second, at around 3 metres per second in the countermovement jump — and that despite 7 kilograms more body mass [1]. The world-class reference in countermovement and squat jump is roughly 2.9 metres per second of take-off velocity [1], the speed at which the centre of mass leaves the ground.
Without measurement that development would have been filed as weight gain — with measurement it was proof that the rebuild was working.
It measures how fast your centre of mass leaves the ground. Roughly 2.9 metres per second is the world-class orientation [1]. The value is deliberately unspecific — it tells you whether your force engine is running, not whether you can call it up on the hill.
This is the single most important test of the jumping half, because vertical velocity in jump imitation together with body mass explains the majority of World Cup jumping performance [2]. This is exactly where force separates from usable force. Two to three times per season is enough [1].
In seven elite combined athletes, roller-ski economy improved significantly at every speed tested towards the competition season, carried by the anaerobic contribution, while the aerobic contribution stayed unchanged [3]. A step test that logs only the maximum value would have missed this progress entirely.
For the documented Olympic champion, the highest VO2peak was 5.36 litres per minute, or 72.0 millilitres per kilogram per minute — measured in the third of four seasons and only maintained afterwards, while results kept improving [1]. A plateau in the lab is not a standstill in the race.
The real diagnosis emerges only in relation: explosiveness, specific jump performance and economy on the same timeline. If endurance rises while jump imitation falls, you have made your interference visible — measured instead of felt.
Maximal tests are genuinely demanding. Exhaustion tests and maximal jump tests belong under sports-medical supervision, well warmed up, and not in phases with infection, sleep deprivation or unexplained symptoms. Collapsing in a test does not win you data, it costs you a week.
Explosive tests load tendons with high peak forces. Schedule test protocols into phases with sufficient recovery, not at the end of a hard block — otherwise you measure fatigue and call it a loss of performance.
And unchanged for the jumping half: this page explains and motivates, it never replaces supervised training on the hill with a club and a qualified coach. Jump imitation on the ground is diagnostics; jumping on the hill is something else and happens exclusively under supervision.
Alongside every test value, log the training load of the preceding seven days. Not as an excuse, but as an interpretation aid.
The most common false alarm in combined diagnostics is a poor jump value after a hard endurance block — that is not lost explosiveness, it is measured interference. Record that context and you separate real trends from snapshots. And that distinction is exactly what makes this two-sided sport steerable at all.
Three families: countermovement jump for general explosiveness, jump imitation for the sport-specific translation — two to three times per season at elite level [1] — and roller-ski step tests for endurance and economy, typically in spring and autumn [3]. Lab values sit on top as context [2].
Roughly 2.9 metres per second of take-off velocity, meaning the speed at which the centre of mass leaves the ground [1]. In the documented case a future Olympic champion sat at about 3 metres per second and simultaneously improved jump imitation by 0.31 metres per second — despite 7 kilograms more mass [1].
Two to three times per season, as in the elite [1]. Measuring more often does not raise accuracy, it raises the chance of reading daily form as a trend. Identical conditions matter more than frequency.
Switch to economy. For one documented Olympic champion the highest VO2peak was measured in the third of four seasons and only maintained afterwards, while results kept improving [1]. In elite combined athletes, economy and anaerobic contribution improved while the aerobic contribution stayed unchanged [3].
Because combined athletes differ measurably from both specialist groups [4] and their endurance value sits below that of pure skiers by design [5]. Without jump diagnostics you see only half the athlete — and precisely the half that creates the starting gap.
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