Reproducibility of maximum aerobic power (VO2max) among soccer players using a modified Heck protocol

OBJECTIVE: To determine the degree of reproducibility of maximum oxygen consumption (VO2max) among soccer players, using a modified Heck protocol. METHODS: 2 evaluations with an interval of 15 days between them were performed on I I male soccer players. All the players were at a high performance level; they were training for an average of 10 hours per week, totaling 5 times a week. When they were evaluated, they were in the middle of the competitive season, playing I match per week. The soccer players were evaluated on an ergometric treadmill with velocity increments of 1.2 km h(-1) every 2 minutes and a fixed inclination of 3% during the test. VO2max was measured directly using a breath-by-breath metabolic gas analyzer. RESULTS: The maximum running speed and VO2max attained in the 2 tests were, respectively: (15.6 +/- 1.1 vs. 15.7 +/- 1.2 km h(-1); [P =.781]) and (54.5 +/- 3.9 vs. 55.2 +/- 4.4 ml kg(-1)min(-1); [P =.88]). There was high and significant correlation of VO2max between the 2 tests with a 15-day interval between them [r = 0.97; P <.001]. CONCLUSION: The modified Heck protocol was reproducible, and the 15-day interval between the ergospirometrie testing was insufficient to significantly modify the soccer players' VO2max values.