Human Performance Research Group, Santa Catarina State University, Florianópolis, Brazil.
Int J Sports Med. 2012 Nov;33(11):892-7. doi: 10.1055/s-0032-1311595. Epub 2012 Jun 15.
The aim of this study was to examine whether intermittent critical speed (ICS) is the threshold velocity above which intermittent exercise leads to the attainment of VO(2max). After an incremental test, 7 active male subjects (49.7 ± 3.74 mL.min (- 1).kg (- 1)) performed 3 intermittent exercises until exhaustion at 100%, 110%, 120% of the velocity associated with VO(2max) to determine ICS. On 4 occasions, the subjects performed intermittent exercise tests until exhaustion at the velocity corresponding to 105% (IE(105)) and 110% (IE(110)) of ICS, and at a speed that was initially set at 125%ICS but which then decreased to 105%ICS (IE(125-105)) in one instance and to 110%ICS (IE(125-110)) in another. The intermittent exercises consisted of repeated 30-s runs alternated with 15-s passive rest intervals. At IE(125)-105, peak VO(2) was not different from VO(2max) but decreased significantly after the change of speed to 105%ICS. During IE(110), peak VO(2) value reached VO(2max) and also during the higher speed at IE(125-110), but did not change when the speed was lowered. These results demonstrated that during intermittent exercise just above ICS (105%) VO(2max) was not elicited, suggesting that ICS might not be the threshold speed above which VO(2max) can be reached.
本研究旨在探讨间歇临界速度（ICS）是否为间歇运动达到最大摄氧量（VO₂max）的速度阈值。在递增测试后，7 名活跃男性受试者（49.7±3.74mL.min⁻¹.kg⁻¹）以 100%、110%和 120%的 VO₂max 相关速度进行 3 次间歇运动直至力竭，以确定 ICS。在 4 次情况下，受试者以 105%（IE（105））和 110%（IE（110））的 ICS 速度进行间歇运动直至力竭，然后速度降低至 105%ICS（IE（125-105）），另一次降低至 110%ICS（IE（125-110））。间歇运动由重复 30 秒的跑步和 15 秒的被动休息间隔交替组成。在 IE（125-105）时，峰值 VO₂并不异于 VO₂max，但速度降低至 105%ICS 后显著降低。在 IE（110）时，峰值 VO₂值达到 VO₂max，在 IE（125-110）的较高速度下也达到 VO₂max，但速度降低时没有变化。这些结果表明，在稍高于 ICS（105%）的间歇运动中未引起 VO₂max，表明 ICS 可能不是达到 VO₂max 的速度阈值。
