间歇性运动中短时间工作与长时间工作对 V̇o 动力学、肌肉去氧合和能量系统贡献的影响。
The effects of short work vs. longer work periods within intermittent exercise on V̇o kinetics, muscle deoxygenation, and energy system contribution.
机构信息
School of Kinesiology, Canadian Center for Activity and Aging, University of Western Ontario, London, Ontario, Canada.
School of Kinesiology, Canadian Center for Activity and Aging, University of Western Ontario, London, Ontario, Canada
出版信息
J Appl Physiol (1985). 2017 Jun 1;122(6):1435-1444. doi: 10.1152/japplphysiol.00514.2016. Epub 2017 Mar 23.
We examined the effects of inserting 3-s recovery periods during high-intensity cycling exercise at 25-s and 10-s intervals on pulmonary oxygen uptake (V̇o), muscle deoxygenation [deoxyhemoglobin (HHb)], their associated kinetics (τ), and energy system contributions. Eleven men (24 ± 3 yr) completed two trials of three cycling protocols: an 8-min continuous protocol (CONT) and two 8-min intermittent exercise protocols with work-to-rest periods of 25 s to 3 s (25INT) and 10 s to 3 s (10INT). Each protocol began with a step-transition from a 20-W baseline to a power output (PO) of 60% between lactate threshold and maximal V̇o (Δ60). This PO was maintained for 8 min in CONT, whereas 3-s periods of 20-W cycling were inserted every 10 s and 25 s after the transition to Δ60 in 10INT and 25INT, respectively. Breath-by-breath gas exchange measured by mass spectrometry and turbine and vastus lateralis [HHb] measured by near-infrared spectroscopy were recorded throughout. Arterialized-capillary lactate concentration ([Lac]) was obtained before and 2 min postexercise. The τV̇o was lowest ( < 0.05) for 10INT (24 ± 4 s) and 25INT (23 ± 5 s) compared with CONT (28 ± 4 s), whereas HHb kinetics did not differ ( > 0.05) between conditions. Postexercise [Lac] was lowest ( < 0.05) for 10INT (7.0 ± 1.7 mM), was higher for 25INT (10.3 ± 1.9 mM), and was greatest in CONT (14.3 ± 3.1 mM). Inserting 3-s recovery periods during heavy-intensity exercise speeded V̇o kinetics and reduced overall V̇o, suggesting an increased reliance on PCr-derived phosphorylation during the work period of INT compared with an identical PO performed continuously. We report novel observations on the effects of differing heavy-intensity work durations between 3-s recovery periods on pulmonary oxygen uptake (V̇o) kinetics, muscle deoxygenation, and energy system contributions. Relative to continuous exercise, V̇o kinetics are faster in intermittent exercise, and increased frequency of 3-s recovery periods improves microvascular O delivery and reduces V̇o and arterialized-capillary lactate concentration. The metabolic burden of identical intensity work is altered when performed intermittently vs. continuously.
我们研究了在 25 秒和 10 秒的间隔高强度自行车运动期间插入 3 秒恢复期对肺氧摄取 (V̇o)、肌肉去氧合 [脱氧血红蛋白 (HHb)]、相关动力学 (τ) 和能量系统贡献的影响。11 名男性（24 ± 3 岁）完成了三个自行车方案的两个试验：连续 8 分钟的方案 (CONT) 和两个 8 分钟的间歇性运动方案，工作-休息期为 25 秒至 3 秒 (25INT) 和 10 秒至 3 秒 (10INT)。每个方案都从 20 瓦的基线到乳酸阈和最大 V̇o (Δ60) 之间的 60%的功率输出 (PO) 进行逐步过渡。CONT 中在 8 分钟内保持此 PO，而在 10INT 和 25INT 中，分别在过渡到 Δ60 后每 10 秒和 25 秒插入 3 秒的 20 瓦自行车运动。通过质谱仪和涡轮机以及股外侧肌 [HHb]测量的呼吸到呼吸气体交换通过近红外光谱进行记录。运动前和运动后 2 分钟测量动脉化毛细血管乳酸浓度 ([Lac])。与 CONT (28 ± 4 s) 相比，10INT (24 ± 4 s) 和 25INT (23 ± 5 s) 的 V̇o 动力学的 τ 最低（<0.05），而 HHb 动力学没有差异（>0.05）。运动后 [Lac] 最低（<0.05）为 10INT（7.0 ± 1.7 mM），25INT 较高（10.3 ± 1.9 mM），CONT 最高（14.3 ± 3.1 mM）。在高强度运动期间插入 3 秒恢复期可加快 V̇o 动力学并降低整体 V̇o，这表明与连续进行的相同 PO 相比，INT 工作期间对 PCr 衍生磷酸化的依赖性增加。我们报告了关于在 3 秒恢复期之间不同的高强度工作持续时间对肺氧摄取 (V̇o) 动力学、肌肉去氧合和能量系统贡献的影响的新观察结果。与连续运动相比，间歇运动的 V̇o 动力学更快，增加 3 秒恢复期的频率可改善微血管 O 输送并降低 V̇o 和动脉化毛细血管乳酸浓度。当以间歇方式而不是连续方式进行时，相同强度工作的代谢负担会发生变化。
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