Recovery of muscular performance by rewarming exercise in the cold
Recovery of muscular performance by rewarming exercise in the cold
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DOI：
10.1016/0167-9457(96)00024-3
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发表时间：
1996-08-01
影响因子：
2.1
通讯作者：
Rissanen, S
中科院分区：
文献类型：
--
作者：
Oksa, J;Rintamaki, H;Rissanen, S
研究了运动对冷却小腿肌肉的肌肉性能和肌电图活动的影响。8名穿着短裤和慢跑鞋的自愿男性受试者（年龄26 +/-4岁（平均值+/-SD），体重72 +/-6 kg，身高175 +/-8 cm，体脂15 +/-3%）参加了研究。他们暴露于27摄氏度和10摄氏度60分钟。60分钟后，暴露于27摄氏度的受试者进行两个最大的下降跳跃（拉伸缩短周期）从一个40厘米的长凳上的力板。对飞行时间进行了分析，选择飞行时间较长的跳跃作为热中性参考。此外，接触阶段的持续时间，力的产生，起飞速度和工作的激动剂-拮抗剂肌肉对的肌电图活动（EMG）（m.小腿三头肌和肌胫骨前肌）进行测量。在暴露于10摄氏度后，受试者进行了一次跳伞。为了研究运动对表现的影响，受试者随后被允许在10摄氏度的跑步机上以1.4米的速度行走5分钟。s（-1）（5 km. h（-1）），每走一圈后，他们重复跳下。重复该循环，直到达到飞行时间中的热中性参考值。一名受试者在三次步行后达到热中性飞行时间值，四名受试者在四次步行后达到热中性飞行时间值，三名受试者在五次步行后达到热中性飞行时间值。接触阶段的热中性水平，缩短过程中的平均力产生和起飞速度最迟在第五次步行后达到。肌肉（m.腓肠肌内侧）温度在两次步行后平均恢复到热中性水平。小腿和胫骨皮肤温度上升显着沿着步行回合，但没有达到热中性水平。步行不影响平均皮肤温度或直肠温度。与缩短阶段27 ℃时的EMG活动相比，冷却降低了激动肌的综合EMG活动（IEMG）和平均功率频率（MPF），但增加了拮抗肌的IEMG活动。这些变化沿着消失，并获得肌电活动的热中性水平。它的结论是，需要一个相对少量的低强度运动，以恢复肌肉温度，肌肉性能和肌电活动的冷却肌肉。激动剂-拮抗剂肌肉对的EMG活性的可逆变化与增加的力产生相关，从而增加飞行时间。
The effect of exercise on muscular performance and EMG-activity of the cooled lower leg muscles was studied. Eight voluntary male subjects (age 26 +/- 4 years (mean +/- SD), weight 72 +/- 6 kg, height 175 +/- 8 cm and body fat 15 +/- 3%) dressed in shorts and jogging shoes participated in the study. They were exposed to 27 degrees C and 10 degrees C for 60 min. After the 60 min exposure to 27 degrees C the subjects performed two maximal drop-jumps (stretch-shortening cycle) from a 40 cm bench onto a force plate. The flight time was analysed and the jump with longer flight time was chosen as thermoneutral reference. Also the duration of the contact phase, force production, takeoff velocity and the electromyographic activity (EMG) of the working agonist-antagonist muscle pair (m. triceps surae and m. tibialis anterior) were measured. After the exposure to 10 degrees C the subjects performed one drop-jump. To study the effect of exercise on the performance the subjects were thereafter allowed to walk on a treadmill at 10 degrees C for 5 min with a speed of 1.4 m . s(-1) (5 km . h(-1)) and after each walking bout they repeated the drop-jump. This cycle was repeated until the thermoneutral reference value in the flight time was achieved. One subject reached the thermoneutral flight time value after three walking bouts, four subjects after four bouts and three subjects after five bouts. Thermoneutral level in the duration of the contact phase, average force production during shortening and takeoff velocity were attained at the latest after the fifth walking bout. Muscle (m. gastrocnemius medialis) temperature was returned to thermoneutral level on the average after two walking bouts. Calf and shin skin temperatures rose significantly along the walking bouts but did not reach thermoneutral level. The walking bouts did not affect mean skin or rectal temperature. When compared to EMG-activity at 27 degrees C during the shortening phase, cooling decreased the integrated EMG-activity (IEMG) and mean power frequency (MPF) of the agonist muscle but increased the IEMG-activity of the antagonist muscle. These changes vanished along with repetitive walking bouts and thermoneutral level of EMG-activity was gained. It is concluded that a relatively small amount of low intensity exercise is required to recover muscle temperature, muscular performance and EMG-activity of the cooled muscles. The reversible changes in EMG-activity of the agonist-antagonist muscle pair correlated with the increased force production and thus increase in the flight time.