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首页> 外文期刊>Experimental Gerontology >Torque steadiness and neuromuscular responses following fatiguing concentric exercise of the knee extensor and flexor muscles in young and older individuals
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Torque steadiness and neuromuscular responses following fatiguing concentric exercise of the knee extensor and flexor muscles in young and older individuals

机译：在年轻人和老年人的膝盖伸肌锻炼和屈曲肌肉锻炼后的扭矩稳定性和神经肌肉反应

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The purpose of this study was to investigate the age-related alterations in the ability to exert maximal and to sustain submaximal isometric muscle torques after a fatiguing concentric exercise conducted with knee extensor (KE) and flexor (KF) muscles. Sixteen young (aged 19-30 years; 8 women) and 17 older (aged 65-75 years; 9 women) volunteers participated. The following tasks were performed before and immediately after 22 maximal concentric efforts of the right KE and KF at 1.05 rad/s: (1) a maximal voluntary isometric contraction (MVIC) task involving both KE and KF; and (2) a KE torque-steadiness task at a submaximal target contraction intensity (20% MVIC). During the dynamometric tests, surface EMG was recorded simultaneously from the KE and KF muscles. Fatigue-induced reductions in knee extension MVIC were similar (similar to 15%) between groups, but young participants showed more pronounced declines in agonist (i.e. quadriceps) EMG responses in both time (RMS amplitude; similar to 15% vs. similar to 10%, p < 0.001) and frequency (median frequency; similar to 14% vs. similar to 8%, p < 0.01) domains. Torque steadiness exhibited a similar post-fatigue decrease in the two age groups (p < 0.01), but interestingly agonist activation (similar to 17%; p < 0.001) and antagonist (i.e. hamstrings) co-activation (similar to 16%; p < 0.001) declined only in the older participants. These findings suggest that the fatiguing concentric KE and KF exercise results in similar relative reductions (%) in maximal torque and steadiness of the KE in young and older individuals, but they are sustained by different age-related neuromuscular strategies.
机译：本研究的目的是探讨与膝关节（KE）和屈肌（KF）肌肉进行疲劳同心运动后发挥最大和维持潜水等距肌肉扭矩的年龄相关的改变。十六名年轻（19-30岁; 8名女性）和17名年龄较大（65-75岁; 9名女性）志愿者参加。在1.05 rad / s的右键和kf的22次最大同心努力之后进行以下任务：（1）涉及Ke和Kf的最大自愿等距收缩（MVIC）任务; （2）ke扭矩 - 在潜水靶收缩强度（20％MVIC）下的稳定性任务。在动力测量测试期间，表面EMG从KE和KF肌肉同时记录。膝关节延伸MVIC的疲劳诱导的减少在组之间类似（类似于15％），但年轻参与者在两次（RMS幅度类似于15％与15％与15％相似的激动剂（即Quadriceps）EMG响应中呈现更明显的下降。 ％，P <0.001）和频率（中值;类似于14％与8％，P <0.01）结构域。扭矩稳定性表现出类似的两龄龄群（P <0.01）的疲劳后疲劳性降低（P <0.01），但同样的激动激活（类似于17％; p <0.001）和拮抗剂（即腿刺）共激活（类似于16％; p <0.001）仅在旧的参与者中拒绝。这些研究结果表明，疲劳同心KE和KF运动导致在年轻人和老年人的ke最大扭矩和ke的稳定性相似的相似相对还原（％），但它们是由不同年龄相关的神经肌肉策略持续的。

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