Effect of hydration state on strength, power, and resistance exercise performance
Effect of hydration state on strength, power, and resistance exercise performance
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DOI：
10.1249/mss.0b013e3180de5f22
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发表时间：
2007-10-01
期刊：
影响因子：
--
通讯作者：
Anderson, Jeffrey M.
中科院分区：
文献类型：
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作者：
Judelson, Daniel A.;Maresh, Carl M.;Anderson, Jeffrey M.
目的：虽然许多研究试图检查水分不足对力量，功率和高强度耐力的影响，但很少有人成功地将全身水分的变化与改变性能的其他变量（例如，增加的核心温度），并且没有人记录过水合不足对等张、多组、多重复运动的典型抗阻运动训练的影响。此外，没有研究记录水分不足对中枢神经系统刺激肌肉组织能力的影响，尽管许多科学家提出了这种可能性。本研究的目的是检查水合状态对1）力量，功率和急性抗阻运动的性能，以及2）中枢激活率（CAR）的单独影响。研究方法：七名健康的阻力训练男性（年龄= 23 +/- 4岁，体重= 87.8 +/- 6.8 kg，体脂= 11.5 +/- 5.2%）在不同的水合状态下完成了三次阻力运动：脱水（EU），脱水约2.5%体重（HY 25），脱水约5.0%体重（HY 50）。研究人员通过运动热应激和控制液体摄入量1天前测试操纵水合状态。结果：在HY 25和HY 50期间，体重分别下降2.4 +/- 0.4和4.8 +/- 0.4%。在垂直跳跃高度、峰值下肢力量（通过跳跃深蹲评估）或峰值下肢力量（通过等长后蹲评估）方面，试验之间不存在显著差异。CAR随着水化不足增加而趋于降低（EU = 95.6 +/-4.9%，HY 25 = 94.0 +/-3.1%，HY 50 = 92.5 +/- 5.1%; P = 0.075，eta（2）（p）= 0.41）。当作为一个功能的百分比完成的总工作在六组回蹲协议，水分不足显着降低阻力运动性能在2-3和2-5集HY 25和HY 50，分别。结论：这些数据表明，水分不足衰减抗阻运动的表现，中枢驱动的作用作为驱动这些反应的致病机制值得进一步研究。
Purpose: Although many studies have attempted to examine the effect of hypohydration on strength, power, and high-intensity endurance, few have successfully isolated changes in total body water from other variables that alter performance (e.g., increased core temperature), and none have documented the influence of hypohydration on an isotonic, multiset, multirepetition exercise bout typical of resistance exercise training. Further, no investigations document the effect of hypohydration on the ability of the central nervous system to stimulate the musculature, despite numerous scientists suggesting this possibility. The purposes of this study were to examine the isolated effect of hydration state on 1) strength, power, and the performance of acute resistance exercise, and 2) central activation ratio (CAR). Methods: Seven healthy resistance-trained males (age = 23 +/- 4 yr, body mass = 87.8 +/- 6.8 kg, body fat = 11.5 +/- 5.2%) completed three resistance exercise bouts in different hydration states: eulrydrated (EU), hypohydrated by approximately 2.5% body mass (HY25), and hypohydrated by approximately 5.0% body mass (HY50). Investigators manipulated hydration status via exercise-heat stress and controlled fluid intake 1 d preceding testing. Results: Body mass decreased 2.4 +/- 0.4 and 4.8 +/- 0.4% during HY25 and HY50, respectively. No significant differences existed among trials in vertical jump height, peak lower-body power (assessed via jump squat), or peak lower-body force (assessed via isometric back squat). CAR tended to decrease as hypohydration increased (EU = 95.6 +/- 4.9%, HY25 = 94.0 +/- 3.1%, HY50 = 92.5 +/- 5.1%; P = 0.075, eta(2)(p) = 0.41). When evaluated as a function of the percentage of total work completed during a six-set back squat protocol, hypohydration significantly decreased resistance exercise performance during sets 2-3 and 2-5 for HY25 and HY50, respectively. Conclusion: These data indicate that hypohydration attenuates resistance exercise performance; the role of central drive as the causative mechanism driving these responses merits further research.