The Yo-Yo Intermittent Recovery Test: Physiological Response, Reliability, and Validity

Abstract

The test had a high reproducibility and sensitivity, allowing for detailed analysis of the physical capacity of athletes in intermittent sports. Specifically, the Yo-Yo intermittent recovery test was a valid measure of fitness performance in soccer. During the test, the aerobic loading approached maximal values, and the anaerobic energy system was highly taxed. Additionally, the study suggests that fatigue during intense intermittent short-term exercise was unrelated to muscle CP, lactate, pH, and glycogen.

Dietary nitrate supplementation improves sprint and high-intensity intermittent running performance

“…On the day of each experimental visit, subjects consumed 1 x 70 mL of their allocated daily supplement 2.5 hours prior to arriving at the laboratory and commencing the exercise tests. The Yo-Yo IR1 test consisted of running repeated 2 x 20 m intervals, back and forth between the start, turn and finish markers at progressively increasing speeds indicated by audio bleeps from a portable audio device (see Krustrup et al 2003). Each 2 x 20 m interval was separated by a 10 s active recovery period in which subjects would jog 2 x 5 m indicated by a marker placed behind the finishing line.…”

Physical Qualities of International Female Rugby League Players by Playing Position

“…The within-session reproducibility of the RSI was ICC = 0.93 and CV = 3.5%. Endurance: Subjects endurance capacity was assessed via the Yo-Yo IRT-1 (25), which has recently been used in rugby league (36, 37). Subjects completed 2 x 20 m shuttle runs, interspersed with 10 seconds of active recovery.…”

Influence of oxygen uptake kinetics on physical performance in youth soccer

“…Starting at 60 s, the fitting window was therefore widened by 1 s until the end of exercise 252 with the time constant and reduced chi-square value of the curve of best fit for each time window plotted against 253 time. The onset of the slow component could then be identified as the coincident point at which a plateau or 254 minima in the value of  and a minima in chi-square, followed by a progressive increase in these values, could be 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 6411 Krustrup et al, 2003). All players were familiar with the Yo-Yo IR1, as it is a fitness test regular employed (4 271 times a season) by the respective Academy.…”