The aim of this study was to compare the physiological, mechanical and perceptual responses to two sprint interval training (SIT) sessions with very short vs. long sprints, and to verify if those differences could be reflected in measures of acute fatigue. Eleven physically active men performed, after the maximum oxygen consumption (VO(2)max) determination, SIT5s (16x5s with 24s of recovery) and SIT20s (4x20s with 120s of recovery) in random order on a cycle ergometer. Physiological, mechanical, and perceptual responses were evaluated during and after the sessions. The countermovement jump (CMJ) height and autonomic control of heart rate (HR) were evaluated before and after the sessions. Diet was also controlled through recall questionnaires. During the training, SIT5s exhibited greater HR, VO2, power output, and total work (TW) (p .05). A faster HR recovery (HRR) and a higher CMJ height were observed after the SIT5s (p .05). Some correlations between the mechanical and physiological responses were revealed only in the SIT5s. SIT5s was demonstrated to be more efficient as exhibited by greater mechanical responses associated with a higher aerobic activity, when compared to the volume-matched SIT protocol of longer sprints. Simple monitoring tools such as HRR and CMJ could help practitioners to detect differences in acute fatigue after different SIT sessions.

中文翻译：

---

在短时冲刺间隔训练（SIT）期间，较短的短跑会引起更大的心肺和机械反应，并减少疲劳

这项研究的目的是比较两次短跑和长跑短跑间隔训练（SIT）的生理，机械和知觉反应，并验证这些差异是否可以反映在急性疲劳的测量中。确定最大耗氧量（VO（2）max）后，有11名身体活动的男性在循环测功机上以随机顺序执行SIT5s（16x5s，恢复24s）和SIT20s（4x20s，恢复120s）。在会议期间和之后评估生理，机械和知觉反应。在运动前和运动后分别评估反运动跳跃（CMJ）高度和自主控制心率（HR）。饮食也通过召回问卷进行控制。在训练期间，SIT5表现出更高的心率，VO2，功率输出和总功（TW）（p.05）。SIT5s后观察到更快的HR恢复（HRR）和更高的CMJ高度（p .05）。机械和生理反应之间的一些相关性仅在SIT5s中揭示。与更长冲刺的体积匹配SIT方案相比，SIT5s具有更高的机械响应和更高的有氧运动能力，显示出更高的效率。简单的监控工具（例如HRR和CMJ）可以帮助从业者在不同的SIT会话后检测急性疲劳的差异。与更长冲刺的体积匹配SIT协议相比。简单的监控工具（例如HRR和CMJ）可以帮助从业者在不同的SIT会话后检测急性疲劳的差异。与更长冲刺的体积匹配SIT协议相比。简单的监控工具（例如HRR和CMJ）可以帮助从业者在不同的SIT会话后检测急性疲劳的差异。