Bosquet L, Duchene A, Dupont G, Leger L, Carter H
Faculty of Sport Sciences, University of Lille 2, Ronchin, France.
Int J Sports Med. 2007 Jun;28(6):518-24. doi: 10.1055/s-2006-955896. Epub 2007 Mar 15.
The aim of this study was to compare .VO2 kinetics of highly- versus recreationally-trained subjects during a constant velocity test of supramaximal intensity. Eighteen trained male subjects were recruited to one of two groups: highly trained (HT, n = 8, .VO(2max) = 70.1 +/- 6.5 ml . min (-1) . kg (-1)) and recreationally trained (RT, n = 10, .VO(2max) = 63.2 +/- 6.4 ml . min (-1) . kg (-1)). All subjects performed an incremental test to exhaustion for the determination of .VO(2max) and peak treadmill velocity (PTV), two constant velocity tests at 110 % of PTV to determine .VO2 kinetics and oxygen deficit (O(2)def), and a 800-m time trial to determine running performance (mean velocity over the distance, V (800 m)). We found significant differences between HT and RT for the on-transient of the .VO2 response (tau, 24.7 +/- 3.3 and 30.9 +/- 7.0 s, respectively), the amplitude of the .VO2 response (60.0 +/- 5.0 and 53.5 +/- 5.7 ml . min (-1) . kg (-1), respectively) and V (800 m) (6.27 +/- 2.1 and 5.45 +/- 0.38 m . s (-1), respectively). O(2)def (24.6 +/- 2.7 and 27.7 +/- 7.8 ml . kg (-1), respectively) and the gain of the .VO2 response (193 +/- 14 and 194 +/- 13 ml . kg (-1) . m (-1), respectively) were similar between groups. tau was associated with O(2)def (r = 0.90, p < 0.05), but not with V (800 m) (r = 0.30, p > 0.05). It was concluded that HT subjects exhibited faster on-kinetics and higher amplitude than their RT counterparts. The higher amplitude was not thought to reflect any difference in underlying physiological mechanisms. The faster tau, whose exact mechanisms remain to be elucidated, may have practical implications for coaches.
本研究的目的是在超最大强度的恒速测试中比较高度训练与业余训练受试者的摄氧量动力学。18名训练有素的男性受试者被招募到两组中的一组：高度训练组（HT，n = 8，摄氧量峰值 = 70.1±6.5毫升·分钟⁻¹·千克⁻¹）和业余训练组（RT，n = 10，摄氧量峰值 = 63.2±6.4毫升·分钟⁻¹·千克⁻¹）。所有受试者进行递增运动至力竭测试以确定摄氧量峰值和跑步机峰值速度（PTV），在PTV的110%进行两次恒速测试以确定摄氧量动力学和氧亏（O₂亏），以及进行800米计时赛以确定跑步成绩（全程平均速度，V（800米））。我们发现，在摄氧量反应的起始瞬态方面（时间常数τ，分别为24.7±3.3秒和30.9±7.0秒）、摄氧量反应的幅度方面（分别为60.0±5.0和53.5±5.7毫升·分钟⁻¹·千克⁻¹）以及V（800米）方面（分别为6.27±2.1和5.45±0.38米·秒⁻¹），HT组和RT组之间存在显著差异。两组之间的O₂亏（分别为24.6±2.7和27.7±7.8毫升·千克⁻¹）以及摄氧量反应的增益（分别为193±14和194±13毫升·千克⁻¹·米⁻¹）相似。时间常数τ与O₂亏相关（r = 0.90，p < 0.05），但与V（800米）无关（r = 0.30，p > 0.05）。得出的结论是，HT组受试者比RT组受试者表现出更快的起始动力学和更高的幅度。更高的幅度被认为并未反映潜在生理机制上的任何差异。时间常数τ更快，其确切机制仍有待阐明，这可能对教练具有实际意义。
