Kachouri M, Vandewalle H, Huet M, Thomaïdis M, Jousselin E, Monod H
Laboratoire de Physiologie du Travail et du Sport, Faculté de Médecine Pitié-Salpétrière, Paris.
Arch Physiol Biochem. 1996;104(3):330-6. doi: 10.1076/apab.104.3.330.12901.
The velocity of the last stage of the Montreal Track Test (MTT) has been measured in fifteen well trained runners. This velocity (vMTT) was assumed to be close to maximal aerobic running speed. In three different sessions, the subjects ran up to exhaustion at velocities corresponding to 95, 100 and 105% vMTT. The exhaustion time at 100 % vMTT (tlim100) was assumed to be an estimation of the exhaustion time corresponding to maximal aerobic speed. The relationship between exhaustion time (tlim) and distance (Dlim) in the case of running exercises at constant velocity until exhaustion can be described by a linear relationship (Dlim = D + b*tlim). The slope of the relation corresponds to a velocity (vcrit) which can be sustained for a long time. The values of vcrit were calculated from the results of running exercises performed at 95, 100 and 105% of vMTT. The present study showed that tlim at 100% vMTT (tlim100) was negatively correlated with vMTT and vcrit but that D and ratio vcrit/vMTT were independent of vMTT. A theoretical study based on models previously proposed for oxygen kinetics during supramaximal exercises (exponential model and Margaria's model) demonstrates that this negative relationship between vMTT and tlim100 can be explained by the kinetics of the accumulation of oxygen deficit (O2 def). tlim100 should also depend on VO2max, maximal oxygen deficit (Max O2 def) and the relative importance of anaerobic energy when a VO2 plateau is reached. Moreover, the value of tlim100 largely depends on the accuracy of the assessment of vMTT. Consequently, the exhaustion times corresponding to the different estimations of maximal aerobic speed on a track or a treadmill cannot be considered as valid indices of aerobic endurance.
在15名训练有素的跑步者身上测量了蒙特利尔田径测试（MTT）最后阶段的速度。该速度（vMTT）被认为接近最大有氧跑步速度。在三个不同的时段，受试者以相当于vMTT的95%、100%和105%的速度跑步直至力竭。100% vMTT时的力竭时间（tlim100）被认为是对应于最大有氧速度的力竭时间的估计值。在以恒定速度跑步直至力竭的情况下，力竭时间（tlim）与距离（Dlim）之间的关系可以用线性关系来描述（Dlim = D + b*tlim）。该关系的斜率对应于一个可以长时间维持的速度（vcrit）。vcrit的值是根据在vMTT的95%、100%和105%下进行的跑步练习结果计算得出的。本研究表明，100% vMTT时的tlim（tlim100）与vMTT和vcrit呈负相关，但D以及vcrit/vMTT的比值与vMTT无关。一项基于先前提出的超最大运动期间氧动力学模型（指数模型和马尔加里亚模型）的理论研究表明，vMTT与tlim100之间的这种负相关关系可以用氧亏积累（O2 def）的动力学来解释。tlim100还应取决于最大摄氧量（VO2max）、最大氧亏（Max O2 def）以及达到VO2平台期时无氧能量的相对重要性。此外，tlim100的值在很大程度上取决于vMTT评估的准确性。因此，在跑道或跑步机上对应于不同最大有氧速度估计值的力竭时间不能被视为有氧耐力的有效指标。
