Billat V, Binsse V, Petit B, Koralsztein J P
Laboratoire des Sciences du Sport, Université Paris V, France.
Arch Physiol Biochem. 1998 Feb;106(1):38-45. doi: 10.1076/apab.106.1.38.4396.
During prolonged and intense running exercises beyond the critical power level, a VO2 slow component elevates VO2 above predicted VO2-work rates calculated from exercise performed at intensities below the lactate threshold. In such cases, the actual VO2 value will increase over time until it reaches VO2max. The aims of the present study were to examine whether the VO2 slow component is a major determinant of VO2 over time when running at a speed beyond critical velocity, and whether the exhaustion latency period at such intensity correlates with the magnitude of the VO2 slow component. Fourteen highly trained long-distance runners performed four exhaustive runs, each separated by one week of light training. VO2 and the velocity at VO2max (vVO2max) were determined for each by a graded treadmill exercise. The critical velocity (86.1 +/- 1.5% vVO2max) of each runner was calculated from exhaustive treadmill runs at 90, 100 and 105% of vVO2max. During supra-critical velocity runs at 90% of vVO2max, there was no significant rise in VO2max (20.9 +/- 2.1 ml min-1 kg-1 between the third and last min of tlim 90), such that the runners reached a VO2 steady-state, but did not reach their vVO2max level over time (69.5 +/- 5.0 vs 74.9 +/- 3.0 ml min-1 kg-1). Thus, subjects' time to exhaustion at 90% of vVO2max was not correlated with the VO2max slow component (r = 0.11, P = 0.69), but significantly correlated with the lactate threshold (r = 0.54, P = 0.04) and the critical velocity (% vVO2max; r = 0.65, P = 0.01). In conclusion, the present study demonstrates that for highly trained long-distance runners performing exhaustive, supra-critical velocity runs at 90% of vVO2max, there was not a VO2 slow component tardily completing the rise of VO2. Instead, runners will maintain a VO2 steady-state below VO2max, such that the time to exhaustion at 90% of vVO2max for these runners is positively correlated with the critical velocity expressed as % of vVO2max.
在超过临界功率水平的长时间高强度跑步运动中，VO₂慢成分会使VO₂升高至高于根据低于乳酸阈值强度下运动计算出的预测VO₂-功率值。在这种情况下，实际VO₂值会随时间增加，直至达到VO₂max。本研究的目的是检验当以超过临界速度的速度跑步时，VO₂慢成分是否是VO₂随时间变化的主要决定因素，以及在此强度下的疲劳潜伏期是否与VO₂慢成分的大小相关。14名训练有素的长跑运动员进行了4次力竭性跑步，每次跑步间隔一周的轻松训练。通过分级跑步机运动分别测定每位运动员的VO₂和VO₂max时的速度（vVO₂max）。根据在vVO₂max的90%、100%和105%进行的力竭性跑步机跑步计算出每位运动员的临界速度（86.1±1.5% vVO₂max）。在以vVO₂max的90%进行超临界速度跑步期间，VO₂max没有显著升高（在tlim 90的第3分钟和最后一分钟之间为20.9±2.1 ml·min⁻¹·kg⁻¹），因此运动员达到了VO₂稳态，但随着时间推移未达到其vVO₂max水平（69.5±5.0 vs 74.9±3.0 ml·min⁻¹·kg⁻¹）。因此，运动员在vVO₂max的90%时的力竭时间与VO₂max慢成分无关（r = 0.11，P = 0.69），但与乳酸阈值显著相关（r = 0.54，P = 0.04）以及临界速度（% vVO₂max；r = 0.65，P =
