Inspiratory muscles experience fatigue faster than the calf muscles during treadmill marching
Inspiratory muscles experience fatigue faster than the calf muscles during treadmill marching
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DOI：
10.1016/j.resp.2006.08.005
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发表时间：
2007-04-16
影响因子：
2.3
通讯作者：
Halpern, Pinchas
中科院分区：
文献类型：
--
作者：
Perlovitch, Renana;Gefen, Amit;Halpern, Pinchas
呼吸肌在极端体力活动期间可能疲劳，从而成为导致疲劳的限制因素的可能性在文献中有争议。本研究的目的是确定跑步机行军运动是否会引起呼吸肌疲劳，并比较呼吸肌疲劳的程度和速度的小腿肌肉组织。为了识别肌肉疲劳，在以8 km/h的恒定速度进行2 km的跑步机行进期间测量吸气肌（胸锁乳突肌、外肋间肌）、呼气肌（腹直肌和外斜肌）和小腿（腓肠肌外侧肌）的表面肌电图（EMG）信号。通过确定EMG的均方根（RMS）随时间的增加来评估疲劳程度，并根据EMG RMS与时间曲线的斜率来评估疲劳率。结果表明：（i）吸气肌和小腿肌肉是跑步机行进过程中最主要的疲劳肌群;（ii）在运动的初始阶段和终末阶段，各肌群的疲劳率是单调的;（iii）在运动的终末阶段，吸气肌的疲劳明显快于小腿肌肉，并且在初始运动期间也可能更快地疲劳。因此，本研究支持这一假设，即吸气肌的疲劳可能是一个限制因素，在行使。(c)2006 Elsevier B. V.保留所有权利。
The possibility that respiratory Muscles may fatigue during extreme physical activity and thereby become a limiting factor leading to exhaustion is debated in the literature. The aim of this study was to determine whether treadmill marching exercise induces respiratory muscle fatigue, and to compare the extent and rate of respiratory muscle fatigue to those of the calf musculature. To identify muscle fatigue, surface electromyographic (EMG) signals of the inspiratory (sternomastoid, external intercostals), expiratory (rectus abdominis and external oblique) and calf (gastrocnemius lateralis) muscles were measured during a treadmill march of 2 kin at a constant velocity of 8 km/h. The extent of fatigue was assessed by determining the increase in root-mean-square (RMS) of EMG over time, and the rate of fatigue was assessed from the slope of the EMG RMS versus time curve. Results indicated that (i) the inspiratory and calf muscles are the ones experiencing the most dominant fatigue during treadmill marching, (ii) the rate of fatigue of each muscle group was monotonic between the initial and terminal phases of exercise, and (iii) the inspiratory muscles fatigue significantly faster than the calf at the terminal phase of exercise, and are likely to fatigue faster during the initial exercise as well. Accordingly, this study supports the hypothesis that fatigue of the inspiratory muscles may be a limiting factor during exercise. (c) 2006 Elsevier B.V. All rights reserved.