摘要：The purpose of this study was to examine the reproducibility of cycling time to exhaustion (Tmax) at maximum oxygen uptake (VO2 max) in competitive cyclists. Seventeen subjects (age, 36.9 ± 7.8 yrs; body mass, 71.1 ± 10.1 kg; height, 1.73 ± 0.8 cm; body fat, 13.1 ± 5.7 %; VO2 max, 54.7 ± 9.0 mlkg-1 min-1 ) performed an incremental exercise test and two Tmax tests. While cycling time to exhaustion was correlated for both Tmax tests (r = 0.80, p = 0.01), the Tmax2 test (238.6 ± 33.5 sec) was significantly higher than the Tmax1 test (223.2 ± 31.3 sec, p < 0.02). Similarly, heart rate to exhaustion was correlated for both Tmax tests (r = 0.89, p = 0.01) but the difference failed to have any practical value (Tmax1 = 182 ± 8 vs. Tmax2 = 183 ± 7 bpm). The blood lactate peak from the first test (10.8 ± 2.0 mmoll -1 ) was also correlated (r = 0.63, p = 0.07) without a significant difference between the two tests (9.8 ± 1.5 mmoll -1 ). VO2 peak for the first test (56.5 ± 9.1 mlkg-1 min-1 ) was strongly correlated (r = 0.94, p = 0.06) and did not differ from the second test (54.6 ± 7.8 mlkg-1 min-1 ). These data demonstrate that the time to exhaustion (Tmax) at VO2 max in a series of two cycling tests is significantly greater than the first.
关键词：Reproducibility;Cycling Time to Exhaustion;VO2 Max.
