ACCEPTABILITY OF INTERMITTENT HANDGRIP CONTRACTIONS BASED ON PHYSIOLOGICAL-RESPONSE
ACCEPTABILITY OF INTERMITTENT HANDGRIP CONTRACTIONS BASED ON PHYSIOLOGICAL-RESPONSE
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DOI：
10.1177/001872089403600110
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发表时间：
1994-03-01
期刊：
影响因子：
3.3
通讯作者：
FRANSSONHALL, C
中科院分区：
文献类型：
--
作者：
BYSTROM, S;FRANSSONHALL, C
目的是研究间歇性肌肉收缩的生理反应和可接受性。七名男性受试者进行了八个等距握练习，改变收缩-放松期，但相同的紧张时间产品。局部血流量（BF），心率，血压，肌电图，最大自愿握收缩（MVC），和静脉钾和乳酸浓度的两个前臂中，长达24小时后的运动。采用腕部肌力对电刺激前臂肌肉的反应来研究低频疲劳（LFF）。在运动过程中，记录了自感劳累的评分。LFF与功能能力下降有关，这可能是由净钾损失解释的。回收BF与实验的平均收缩强度呈线性相关。生理标准的接受等长运动的建议，在运动过程中没有疲劳和恢复期内4小时内恢复到基线值的基础上。基于这些生理标准，认为间歇性握力收缩（或高于）17%MVC的平均收缩强度和连续性握力收缩（或高于）10%MVC是不可接受的。
Our aim was to study physiological response and acceptability of intermittent muscle contractions. Seven male subjects performed eight isometric handgrip exercises with altered contraction-relaxation periods but identical tension-time products. Local blood flow (BF), heart rate, blood pressure, electromyography, maximal voluntary handgrip contraction (MVC), and venous concentration of potassium and lactate of both forearms were followed during and up to 24 hours after the exercises. Wrist force response to electrical stimulation of a forearm muscle was used to investigate low-frequency fatigue (LFF). Ratings of perceived exertion were recorded during exercise. LFF was associated with a decreased functional capacity, which may be explained by a net potassium loss. Recovery BF was linearly related to mean contraction intensity of the experiments. Physiological criteria for acceptability of isometric exercise are suggested, based on the absence of fatigue during exercise and the return to baseline values within four hours of the recovery period. Based on these physiological criteria, intermittent handgrip contractions at (or higher than) a mean contraction intensity of 17% MVC and continuous handgrip contractions at (or higher than) 10% MVC were considered unacceptable.