Marles A, Mucci P, Legrand R, Betbeder D, Prieur F
Laboratoire d'Analyse Multidisciplinaire des Pratiques Sportives, Université d'Artois, UFR STPAS, Liévin, France.
Int J Sports Med. 2006 May;27(5):345-50. doi: 10.1055/s-2005-865665.
The disproportionate increase in VO2 ("extra VO2) reported at elevated intensity during incremental exercise (IE) might result from the same physiological mechanisms as the VO2 slow component observed during heavy constant work rate exercise (CWRE). Moreover, it has been demonstrated that prior heavy exercise can diminish the VO2 slow component. The aim of this study was to evaluate whether prior heavy exercise also alters the "extra VO2" during IE. Ten trained sprinters performed three tests on a cycle ergometer: Test 1 was an IE; Test 2 consisted of six minutes of a CWRE (90% of VO2max) followed by six minutes at 35 W and by an IE and Test 3 was composed of two CWRE of six minutes separated by six minutes of exercise at 35 W. For each IE, the slope and the intercept of the VO2/work rate relationship were calculated by linear regression using data before the first Ventilatory Threshold (pre-VT1 slope). The difference between VO2max measured and VO2max expected using the pre-LT slope was calculated (deltaVO2). We also calculated the difference between VO2 at min five and VO2 at min three during CWRE of Test 3 (deltaVO2(5' - 3')). VO2max was significantly higher than VO2exp during IE of Test 1 and Test 2. deltaVO2 during IE did not differ between Test 1 and Test 2 (+ 259 +/- 229 ml x min(-1) vs. + 222 +/- 221 ml x min(-1)). During Test 3, six subjects achieved five minutes of exercise during the second CWRE and deltaVO2(5' - 3') was significantly decreased during the second CWRE (338 +/- 65 ml x min(-1) vs. 68 +/- 98 ml x min(-1), n = 6). These results demonstrate that the amplitude of the "extra VO2"during IE was not affected by prior exercise, whereas the slow component of VO2 evaluated by deltaVO2(5' - 3') during CWRE was lowered. This implies that prior exercise does not have the same effect on the slow component of VO2 and on the "extra VO2". Therefore we were unable to demonstrate a relationship between the VO2 slow component and the extra-VO2 phenomenon during IE.
在递增运动（IE）过程中，高强度时报告的摄氧量不成比例增加（“额外摄氧量”）可能与在重度恒定功率运动（CWRE）期间观察到的摄氧量慢成分具有相同的生理机制。此外，已经证明先前的重度运动可以减少摄氧量慢成分。本研究的目的是评估先前的重度运动是否也会改变递增运动期间的“额外摄氧量”。十名训练有素的短跑运动员在自行车测力计上进行了三项测试：测试1是递增运动；测试2包括六分钟的恒定功率运动（最大摄氧量的90%），然后是六分钟35瓦的运动，接着是递增运动，测试3由两次六分钟的恒定功率运动组成，中间间隔六分钟35瓦的运动。对于每次递增运动，使用第一次通气阈值之前的数据（通气阈值1前斜率）通过线性回归计算摄氧量/功率关系的斜率和截距。计算实测最大摄氧量与使用通气阈值前斜率预期的最大摄氧量之间的差异（摄氧量差值）。我们还计算了测试3的恒定功率运动期间第5分钟和第3分钟摄氧量之间的差异（摄氧量差值（5'-3'））。在测试1和测试2的递增运动期间，最大摄氧量显著高于预期摄氧量。测试1和测试2的递增运动期间摄氧量差值无差异（+259±229毫升·分钟-1对+222±221毫升·分钟-1）。在测试3期间，六名受试者在第二次恒定功率运动中完成了五分钟的运动，第二次恒定功率运动期间摄氧量差值（5'-3'）显著降低（338±65毫升·分钟-1对68±98毫升·分钟-1，n = 6）。这些结果表明，递增运动期间“额外摄氧量”的幅度不受先前运动的影响，而通过恒定功率运动期间摄氧量差值（5'-3'）评估的摄氧量慢成分降低。这意味着先前运动对摄氧量慢成分和“额外摄氧量”的影响不同。因此，我们无法证明递增运动期间摄氧量慢成分与额外摄氧量现象之间的关系。
