High-Intensity Interval Training Increases Cardiac Output and (V) over dotO2max
High-Intensity Interval Training Increases Cardiac Output and (V) over dotO2max
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DOI：
10.1249/mss.0000000000001099
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发表时间：
2017-02-01
期刊：
影响因子：
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通讯作者：
Wood, Kimi M.
中科院分区：
文献类型：
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作者：
Astorino, Todd A.;Edmunds, Ross M.;Wood, Kimi M.
最大摄氧量的增加（（V）超过dotO（2 max））经常发生在高强度间歇训练（HIIT）中，但解释这一结果的特定适应仍然难以捉摸。目的：本研究检查了响应于周期性HIIT的dotO（2 max）（V）和心输出量（CO）的变化。方法：39名活跃男性和女性（平均年龄和（V）超过dotO（2 max）= 22.9 +/- 5.4 yr和39.6 +/- 5.6 mL.kg（-1）.min（-1））进行HIIT，32名男性和女性（年龄和（V）超过dotO（2 max）= 25.7 +/- 4.5 yr和40.7 +/- 5.2 mL.kg（-1）.min（-1））为非运动对照（CON）。HIIT的前10个阶段需要8到10次60秒的循环，90%-110%的峰值功率输出，穿插75秒的恢复，随后随机分为三种方案之一（短跑间歇训练（SIT），高容量间歇训练（HIITHI），或周期性间歇训练（PER），用于随后的10个阶段。在训练前、训练中和训练结束时，完成渐进式循环至力竭，在此期间估计（V）超过dotO（2 max）和最大CO。结果：与CON相比，HIIT + SIT组（39.8 +/- 7.3 www.example.com（-1）.minmL.kg）至43.6 +/- 6.1 mL.kg（-1）.min（-1）），HIIT + HIITHI组（39.8 +/- 7.3 www.example.com（-1）. min（-1）至43.6 +/- 6.1 mL.kg（-1）.min（-1）），（41.1 +/- 4.9 mL.kg（-1）.min（-1）至44.6 +/- 7.0 mL.kg（-1）.min（-1）），HIIT + PER（39.5 +/- 5.6 mL.kg（-1）.min（-1）至44.1 +/- 5.4 mL.kg（-1）.min（-1）），由最大CO显著增加介导（20.0 +/- 3.1 L.min（-1）至21.7 +/- 3.2 L.min（-1），P = 0.04）。HIIT组的最大每搏输出量增加（P = 0.04），但最大HR（P = 0.88）或动静脉氧分压差（P = 0.36）无变化。这些CO数据是准确的，代表了所有三个训练组从HIIT前到HIIT后的平均变化。结论：响应于不同HIIT方案而表现出的（V）超过dotO（2 max）的增加是由于氧输送的改善。
Increases in maximal oxygen uptake ((V) over dotO(2max)) frequently occur with high-intensity interval training (HIIT), yet the specific adaptation explaining this result remains elusive. Purpose: This study examined changes in (V) over dotO(2max) and cardiac output (CO) in response to periodized HIIT. Methods: Thirty-nine active men and women (mean age and (V) over dotO(2max) = 22.9 +/- 5.4 yr and 39.6 +/- 5.6 mL.kg(-1).min(-1)) performed HIIT and 32 men and women (age and (V) over dotO(2max) = 25.7 +/- 4.5 yr and 40.7 +/- 5.2 mL.kg(-1).min(-1)) were nonexercising controls (CON). The first 10 sessions of HIIT required eight to ten 60 s bouts of cycling at 90%-110% percent peak power output interspersed with 75 s recovery, followed by randomization to one of three regimes (sprint interval training (SIT), high-volume interval training (HIITHI), or periodized interval training (PER) for the subsequent 10 sessions. Before, midway, and at the end of training, progressive cycling to exhaustion was completed during which (V) over dotO(2max) and maximal CO were estimated. Results: Compared with CON, significant (P < 0.001) increases in (V) over dotO(2max) in HIIT + SIT (39.8 +/- 7.3 mL.kg(-1).min(-1) to 43.6 +/- 6.1 mL.kg(-1).min(-1)), HIIT + HIITHI (41.1 +/- 4.9 mL.kg(-1).min(-1) to 44.6 +/- 7.0 mL.kg(-1).min(-1)), and HIIT + PER (39.5 +/- 5.6 mL.kg(-1).min(-1) to 44.1 +/- 5.4 mL.kg(-1).min(-1)) occurred which were mediated by significant increases in maximal CO (20.0 +/- 3.1 L.min(-1) to 21.7 +/- 3.2 L.min(-1), P = 0.04). Maximal stroke volume was increased with HIIT (P = 0.04), although there was no change in maximal HR (P = 0.88) or arteriovenous O-2 difference (P = 0.36). These CO data are accurate and represent the mean changes from pre-to post-HIIT across all three training groups. Conclusions: Increases in (V) over dotO(2max) exhibited in response to different HIIT regimes are due to improvements in oxygen delivery.