EMG PATTERNS OF RAT ANKLE EXTENSORS AND FLEXORS DURING TREADMILL LOCOMOTION AND SWIMMING
EMG PATTERNS OF RAT ANKLE EXTENSORS AND FLEXORS DURING TREADMILL LOCOMOTION AND SWIMMING
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DOI：
10.1152/jappl.1991.70.6.2522
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发表时间：
1991-06-01
影响因子：
3.3
通讯作者：
EDGERTON, VR
中科院分区：
文献类型：
--
作者：
ROY, RR;HUTCHISON, DL;EDGERTON, VR
采用肌内肌电描记术（EMG）确定并比较大鼠比目鱼肌（Sol）、胫骨前肌（TA）以及内侧腓肠肌（MG）深层和浅层的募集模式。在不同速度和倾斜度的跑步机运动期间以及游泳期间。对10-20个步进或冲程循环的原始EMG信号进行整流、平均和处理，以确定循环周期（一个循环的EMG开始到下一个循环的EMG开始）、EMG爆发持续时间和整流爆发的积分面积（IEMG）。平均EMG/爆发计算为IEMG/爆发持续时间。IEMG/min计算为IEMG乘以每分钟爆发（循环）次数。周期和爆发持续时间的伸肌呈双曲线下降，而TA爆发持续时间不变，增加跑台速度。随着跑台速度的增加，IEMG在Sol中降低，而在MG和TA中不变，而IEMG/min在Sol中降低，而在MG和TA中增加。在跑步机倾斜的海拔导致MG的激活水平的增加，但不是在溶胶或TA。这些数据表明，在跑步机运动的速度和/或倾斜度增加时所需的额外功率来自于快速伸肌的募集，例如，MG。游泳时的平均周期与最快跑步机运动时观察到的周期相似。然而，肌电图爆发的持续时间和幅度较高的TA，相对相似的MG，和较低的溶胶在游泳比跑步机运动。因此，游泳似乎是一种非负重运动形式，显然是卸载缓慢的反重力肌肉，例如，Sol，并加载屈肌，例如，TA。
Intramuscular electromyography (EMG) was used to determine and compare the recruitment patterns of the rat soleus (Sol), tibialis anterior (TA), and a deep and a superficial portion of the medial gastrocnemius (MG) during treadmill locomotion at various speeds and inclines and during swimming. Raw EMG signals for 10-20 step or stroke cycles were rectified, averaged, and processed to determine cycle period (EMG onset of one cycle to EMG onset of the next cycle), EMG burst duration, and integrated area of the rectified burst (IEMG). Mean EMG per burst was calculated as IEMG/burst duration. IEMG/min was calculated as IEMG times the number of bursts (cycles) per minute. Cycle period and burst duration of the extensors decreased hyperbolically, while the TA burst duration was unchanged, with increased treadmill speed. With increased treadmill speed, IEMG was decreased in the Sol and unchanged in the MG and TA, whereas IEMG/min decreased in the Sol and increased in the MG and TA. An elevation in treadmill incline resulted in an increase in the activation levels of the MG but not in the Sol or TA. These data indicate that the additional power required at increased speeds and/or inclines of treadmill locomotion is derived from the recruitment of the fast extensors, e.g., the MG. The mean cycle period during swimming was similar to that observed during the fastest treadmill locomotion. EMG burst durations and amplitudes, however, were higher in the TA, relatively similar in the MG, and lower in the Sol during swimming than treadmill locomotion. Thus it appears that swimming is a non-weight-bearing form of locomotion that apparently unloads the slow antigravity muscles, e.g., the Sol, and loads the flexors, e.g., the TA.