Field-Based Anaerobic Capacity Test Options: Choosing by Accuracy, Equipment, and Sport Fit

A physical therapist at a semi-pro rugby club emailed us last month with a familiar problem. Her director wanted anaerobic capacity numbers on 34 players before pre-season, and the club's only cycle ergometer had a six-month calibration lapse nobody caught until testing week. She had four weeks, a stopwatch, some cones, and a set of stadium stairs behind the training ground. What she needed wasn't one field test, but a way to figure out which option would actually answer her director's question without pretending a stair sprint and a 30-second jump test measure the same thing.

That's the trap most programs fall into once they start searching for field alternatives. Search for anaerobic field test and four or five protocols show up with roughly the same pitch: cheap, fast, no lab needed. What rarely gets explained is that these tests don't all measure the same physiological quality, so picking the wrong one, or mixing results from two different tests as if interchangeable, produces numbers that look precise but mean something different from what the coach thinks. This guide breaks down four validated field options by what each one actually captures, what equipment and time they require, and which sport contexts each fits best.

Anaerobic capacity is not one thing on a stopwatch. A 30-second all-out effort is built specifically to exhaust phosphocreatine stores within the first 5-10 seconds and force glycolysis to carry the remaining bout, which is why that kind of test reports both a peak power figure and a fatigue index. A field test that only lasts three to five seconds, a single stair sprint for instance, never gets past the phosphocreatine-dominant phase. It measures peak alactic power, a genuinely useful number, but a different one from a 30-second capacity-and-fatigue profile.

This distinction decides which test answers which question. If a coach wants to know how explosive an athlete is over a single maximal effort, a first step, a single jump, a tackle, a short peak-power test like the Margaria-Kalamen stair sprint is the right tool. If the question is how well an athlete holds output across repeated efforts inside a possession, a shift, or a set, the fatigue-resistance question team sports actually care about, the test needs to run long enough or repeat often enough to force that decay, the way RAST, a jump test, and repeated-sprint shuttle protocols all do.

Four field protocols carry enough published validation to be worth a program's time. The table below lays out what each one targets, what it costs to set up, and how long it takes to administer per athlete.

The 30-second jump test gets a full protocol breakdown, sport norms, and fatigue-index math in our 30-second anaerobic power jump test guide, and RAST's setup is covered step by step in our RAST testing protocol guide. The two protocols below, Margaria-Kalamen and the RSA shuttle, get less coverage elsewhere on the site, so this is where we go deep on both.

The Margaria-Kalamen stair test is the oldest field measure of anaerobic power still in regular use, built around a stairwell rather than a track or a mat. Margaria, Aghemo, and Rovelli published the original protocol in the Journal of Applied Physiology in 1966: a subject sprints up a staircase two steps at a time, and photocells at two points along the flight, typically the third and ninth step, record the time to cover the vertical distance between them. Kalamen's later modification added a running start of roughly 2 meters before the base of the stairs, removing reaction-time variance from the push-off and isolating the measurement to the climbing phase itself.

Power output is calculated as P (W) = (body mass in kg x 9.81 x vertical height in m) / time in seconds, using the height between the two timing points rather than the total staircase height. With a typical six-step vertical gain of around 1.05m (steps at roughly 17.5cm each) and trained athletes clearing that section in 0.40-0.50 seconds, peak power outputs commonly land in the following ranges.

Stair riser height and leg length shift the raw number enough that within-program comparisons matter more than outside reference tables. The limitation worth flagging before a program leans on this test: because the climbing effort lasts only three to five seconds, the protocol has no fatigue-index equivalent. It's a single-point measurement of alactic power, full stop, telling you nothing about how output holds up across a 30-second bout or repeated efforts. Programs that need both numbers typically pair a stair sprint (peak power) with RAST or the jump test (capacity and fatigue) rather than treating the stair result as a stand-alone capacity score.

RAST's basic mechanics, six 35m sprints with 10 seconds of active recovery, power calculated from body mass, distance, and sprint time, have been well established since Draper and Whyte introduced the protocol at University College Chichester in 1997, and the full setup is covered in our RAST testing protocol guide linked above. What's less discussed is how well RAST actually predicts a team-sport athlete's ability to repeat sprints in a match, usually the real question behind running the test.

Keir, Theriault, and Serresse (2013, Journal of Strength and Conditioning Research) tested that directly in collegiate soccer players, comparing RAST output against a soccer-specific repeated-sprint protocol. The relationship held up reasonably well for peak and average power, both of which tracked with sprint-based fitness markers, but the RAST fatigue index itself showed a weaker, less consistent relationship with actual repeated-sprint decrement measured on the field. Their conclusion was blunt: RAST is a reasonable proxy for anaerobic power output, but its fatigue index shouldn't be treated as an interchangeable stand-in for sport-specific repeated-sprint ability, a meaningful caveat for any program using that number specifically to flag conditioning gaps.

For team sports where the real concern isn't a single sprint but the fourth or fifth sprint of a shift, a repeated-sprint ability shuttle protocol answers a question neither the stair test nor RAST is built to answer. Fitzsimons, Dawson, Ward, and Wilkinson (1993, Australian Journal of Science and Medicine in Sport) developed the original running version: six 20m shuttle sprints, each started on a 20-second cycle, so the recovery window shrinks as sprint time increases, a deliberately unforgiving structure that mimics how little rest a game actually gives an athlete between efforts.

Total sprint time, best sprint time, and a fatigue percentage-decrement score, calculated as ((total time / (best time x 6)) - 1) x 100, all come out of a single two-minute bout. Impellizzeri and colleagues (2008, International Journal of Sports Medicine) validated a modified shuttle version against match demands in football players, finding that RSA performance related meaningfully to the amount of high-intensity running players covered during actual matches, the practical validity check that matters most for programs deciding whether the test is worth running.

The catch, documented across the broader repeated-sprint literature (see Glaister, 2005, Sports Medicine, for a full review), is that percentage-decrement scores are noisy from session to session; test-retest variability on the fatigue score alone frequently runs higher than on best-sprint time or total time. A single RSA session shouldn't be the basis for a big training decision on its own. Track best-sprint time and total time as the primary numbers, treat the fatigue percentage as a supporting data point that needs two or three sessions before trusting a trend, and retest under identical surface and footwear every time; the decrement score is sensitive enough to friction and shoe grip that a surface change alone can move it several percentage points.

Matching a test to a program comes down to three questions: what physiological quality actually matters for the sport, what equipment is already sitting in the equipment room, and how many athletes need testing in how much time.

None of these four rule out running a lab-based anaerobic test occasionally as a periodic check, our lab-based Wingate anaerobic power test guide covers that protocol, and our broader comparison of running-based and jump-based options against that criterion measure lives in our Wingate alternative field tests guide. But for the week-to-week and month-to-month monitoring most programs actually need, the field option that matches your sport's real demand beats a lab test your budget and schedule can't sustain.

The errors that undercut these tests are rarely about the protocol itself. They're about what happens around it. Warm-up length is the first one: a rugby prop who does a five-minute jog before a Margaria-Kalamen sprint produces a different peak-power number than the same athlete after fifteen minutes of dynamic prep including a few near-maximal stair efforts, and comparing those two sessions as if warm-up were controlled invites a false training-effect conclusion.

Surface and footwear come second. Running RAST on wet turf one month and a dry indoor track the next changes sprint times independent of any real fitness shift, and the same applies to shoe changes between an RSA retest in trainers versus cleats. Recovery timing is the third recurring mistake; testing repeated-sprint ability 18 hours after a heavy leg session will depress every number on the sheet regardless of how fit the athlete actually is, so build in at least 48 hours of reduced load before any of these four tests.

None of that is exotic advice. It's the same discipline lab-based anaerobic testing depends on to be trustworthy, applied to protocols cheap and fast enough that a program can actually run them often enough to matter, which is covered in more depth in our athlete testing battery guide.