Billat V L, Hill D W, Pinoteau J, Petit B, Koralsztein J P
Laboratoire S.T.A.P.S., Université Paris 12, France.
Arch Physiol Biochem. 1996;104(3):313-21. doi: 10.1076/apab.104.3.313.12908.
The velocity associated with the achievement of VO2 max during an incremental treadmill test (v VO2 max) has been reported to be an indicator of performance in middle distance running events. Previous study has shown the reproducibility of the time to exhaustion (time limit: tlim) at v VO2 max performed by well-trained males in the same condition at one week of interval (Billat et al., 1994b). It is essential in studies involving tlim at v VO2 max that the v VO2 max be precisely determined, or else the measured tlim will be meaningless. The purpose of this study was to examine the influence of the stage duration and velocity incrementation on the velocity at VO2 max and, consequently, on the two times to exhaustion (tlim) associated with the two v VO2 max generated by the two protocols. v VO2 max was determined in 15 trained male endurance athletes as the lowest speed at which VO2 max was attained in speed-incremented 0%-slope treadmill tests. For one test, increments were 1.0 km.h-1 and stages were 2 min in duration; for the other test, increments were 0.5 km.h-1 and stages were 1 min in duration. Results of paired means t-tests revealed no difference in v VO2 max obtained using the two protocols. v VO2 max was 20.7 +/- 1.0 km.h-1 with the 1.0 km.h-1 x 2 min protocol and 20.8 +/- 0.9 km.h-1 with the 0.5 km.h-1 x 1 min protocol. In addition, VO2, VCO2, VE, VE/VO2 and respiratory exchange ratio at the submaximal intensities that were common to both protocols (e.g., 17.0 km.h-1, 18.0 km.h-1, 19.0 km.h-1, 20.0 km.h-1) did not differ. Times to exhaustion at the two v VO2 max demonstrated a high degree of inter-individual variability (coefficients of variation were 35% and 45%) but did not differ (345 +/- 120 s versus 373 +/- 169 s). These results demonstrated that small changes in protocol have no significant impact on the value of v VO2 max and in consequence on tlim v VO2 max.
在递增式跑步机测试中，与达到最大摄氧量（VO₂max）相关的速度（vVO₂max）据报道是中距离跑步项目成绩的一个指标。先前的研究表明，训练有素的男性在相同条件下间隔一周进行的vVO₂max下的力竭时间（时间限制：tlim）具有可重复性（比拉特等人，1994b）。在涉及vVO₂max下tlim的研究中，精确测定vVO₂max至关重要，否则测得的tlim将毫无意义。本研究的目的是检验阶段持续时间和速度增量对VO₂max时速度的影响，进而对两种方案产生的两个vVO₂max相关的两个力竭时间（tlim）的影响。在15名训练有素的男性耐力运动员中，将vVO₂max确定为在0%坡度的递增速度跑步机测试中达到VO₂max的最低速度。对于一项测试，增量为1.0 km/h，阶段持续时间为2分钟；对于另一项测试，增量为0.5 km/h，阶段持续时间为1分钟。配对均值t检验结果显示，使用两种方案获得的vVO₂max没有差异。采用1.0 km/h×2分钟方案时，vVO₂max为20.7±1.0 km/h；采用0.5 km/h×1分钟方案时，vVO₂max为20.8±0.9 km/h。此外，两种方案共有的次最大强度下的VO₂、VCO₂、VE、VE/VO₂和呼吸交换率（例如，17.0 km/h、18.0 km/h、19.0 km/h、20.0 km/h）没有差异。两个vVO₂max下的力竭时间表现出高度的个体间变异性（变异系数分别为35%和45%），但没有差异（345±120秒对373±169秒）。这些结果表明，方案的微小变化对vVO₂max的值以及因此对vVO₂max下的tlim没有显著影响。
