冷热条件对人体骨骼肌激活后恢复的影响。

Influence of cold and hot conditions on postactivation in human skeletal muscles.

作者信息

Meigal A Y, Lupandin Y V, Hänninen O

机构信息

Department of Animal and Human Physiology, Petrozavodsk State University, Lenin Strasse, 33, 185640 Petrozavodsk, Republic of Karelia, Russian Federation.

出版信息

Pflugers Arch. 1996 May;432(1):121-5. doi: 10.1007/s004240050113.

DOI:10.1007/s004240050113

PMID:8662276

Abstract

The influence of cold (+5 degrees C), room temperature (+22 degrees C) and hot (+75 degrees C) air exposures on postactivation effects (PAE) in brachial biceps (BBs) and triceps (TBs) muscles were investigated bilaterally in six male subjects. PAE were evoked by 1 min volitional isometric contraction (VIC) at submaximal level in BBs by holding an inertial weight by palms, with right-angled elbows. At room temperature, average EMG during PAE (PAEav) usually was 2-4% and the integral of EMG (PAEint) was 3-7% of that of VIC respectively. PEA duration was 1-6 min. Cold exposure evoked an approximately two-fold increase of PAEint (P < 0.01). Hot exposure decreased PAEint (P < 0.01) and shortened PAE duration by approximately 50% (P < 0.01). In two subjects, long- term modulation of EMG intensity during PAE was observed. Cold increased the frequency and amplitude of these waves, while heat decreased them. In two subjects, alternation of BBs and TBs in EMG activity during PAE was observed. The data obtained suggest that postactivation of muscles strongly depends on the environmental temperature.

摘要

在六名男性受试者双侧研究了冷（+5摄氏度）、室温（+22摄氏度）和热（+75摄氏度）空气暴露对肱二头肌（BBs）和肱三头肌（TBs）肌肉激活后效应（PAE）的影响。通过用手掌握住惯性重量，以直角肘部在BBs进行1分钟次最大水平的自主等长收缩（VIC）来诱发PAE。在室温下，PAE期间的平均肌电图（PAEav）通常分别为VIC期间的2 - 4%，肌电图积分（PAEint）为VIC的3 - 7%。PAE持续时间为1 - 6分钟。冷暴露使PAEint增加约两倍（P < 0.01）。热暴露降低了PAEint（P < 0.01），并使PAE持续时间缩短约50%（P < 0.01）。在两名受试者中，观察到PAE期间肌电图强度的长期调制。冷增加了这些波的频率和幅度，而热则降低了它们。在两名受试者中，观察到PAE期间BBs和TBs肌电图活动的交替。获得的数据表明，肌肉的激活后状态强烈依赖于环境温度。