Millet G P, Libicz S, Borrani F, Fattori P, Bignet F, Candau R
Faculté des Sciences du Sport, 700 Avenue du pic Saint Loup, Montpellier, France.
Eur J Appl Physiol. 2003 Sep;90(1-2):50-7. doi: 10.1007/s00421-003-0844-0. Epub 2003 Jun 13.
The purpose of this study was to test the hypothesis that athletes having a slower oxygen uptake ( VO(2)) kinetics would benefit more, in terms of time spent near VO(2max), from an increase in the intensity of an intermittent running training (IT). After determination of VO(2max), vVO(2max) (i.e. the minimal velocity associated with VO(2max) in an incremental test) and the time to exhaustion sustained at vVO(2max) ( T(lim)), seven well-trained triathletes performed in random order two IT sessions. The two IT comprised 30-s work intervals at either 100% (IT(100%)) or 105% (IT(105%)) of vVO(2max) with 30-s recovery intervals at 50% of vVO(2max) between each repeat. The parameters of the VO(2) kinetics (td(1), tau(1), A(1), td(2), tau(2), A(2), i.e. time delay, time constant and amplitude of the primary phase and slow component, respectively) during the T(lim) test were modelled with two exponential functions. The highest VO(2) reached was significantly lower ( P<0.01) in IT(100%) run at 19.8 (0.9) km(.)h(-1) [66.2 (4.6) ml(.)min(-1.)kg(-1)] than in IT(105%) run at 20.8 (1.0) km(.)h(-1) [71.1 (4.9) ml(.)min(-1.)kg(-1)] or in the incremental test [71.2 (4.2) ml(.)min(-1.)kg(-1)]. The time sustained above 90% of VO(2max) in IT(105%) [338 (149) s] was significantly higher ( P<0.05) than in IT(100%) [168 (131) s]. The average T(lim) was 244 (39) s, tau(1) was 15.8 (5.9) s and td(2) was 96 (13) s. tau(1) was correlated with the difference in time spent above 90% of VO(2max) ( r=0.91; P<0.01) between IT(105%) and IT(100%). In conclusion, athletes with a slower VO(2) kinetics in a vVO(2max) constant-velocity test benefited more from the 5% rise of IT work intensity, exercising for longer above 90% of VO(2max) when the IT intensity was increased from 100 to 105% of vVO(2max).
在间歇跑训练（IT）强度增加时，摄氧量（VO₂）动力学较慢的运动员，就接近VO₂max的时间而言，将受益更多。在测定VO₂max、vVO₂max（即递增测试中与VO₂max相关的最小速度）以及在vVO₂max下的力竭时间（T(lim)）后，七名训练有素的铁人三项运动员以随机顺序进行了两次IT训练。两次IT训练包括以vVO₂max的100%（IT(100%)）或105%（IT(105%)）进行30秒的工作间歇，每次重复之间以vVO₂max的50%进行30秒的恢复间歇。在T(lim)测试期间，VO₂动力学参数（td(1)、tau(1)、A(1)、td(2)、tau(2)、A(2)，即分别为初级阶段和慢成分的时间延迟、时间常数和幅度）用两个指数函数进行建模。在以19.8（0.9）km·h⁻¹ [66.2（4.6）ml·min⁻¹·kg⁻¹]进行的IT(100%)训练中达到的最高VO₂显著低于在以20.8（1.0）km·h⁻¹ [71.1（4.9）ml·min⁻¹·kg⁻¹]进行的IT(105%)训练中或在递增测试中 [71.2（4.2）ml·min⁻¹·kg⁻¹]（P<0.01）。在IT(105%)训练中维持在VO₂max的90%以上的时间 [338（149）秒] 显著高于IT(100%)训练中的时间 [168（131）秒]（P<0.05）。平均T(lim)为244（39）秒，tau(1)为15.8（5.9）秒，td(2)为96（13）秒。tau(1)与IT(105%)和IT(100%)之间在VO₂max的90%以上花费时间的差异相关（r = 0.91；P<0.01）。总之，在vVO₂max等速测试中VO₂动力学较慢的运动员从IT工作强度5%的提高中受益更多，当IT强度从vVO₂max的100%增加到105%时，在VO₂max的90%以上锻炼的时间更长。
