Neural adaptations to long-term resistance training: evidence for the confounding effect of muscle size on the interpretation of surface electromyography
Neural adaptations to long-term resistance training: evidence for the confounding effect of muscle size on the interpretation of surface electromyography
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DOI：
10.1152/japplphysiol.00094.2021
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发表时间：
2021-08-01
影响因子：
3.3
通讯作者：
Folland, Jonathan P.
中科院分区：
文献类型：
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作者：
Skarabot, Jakob;Balshaw, Thomas G.;Folland, Jonathan P.
本研究比较了长期阻力训练（LTRT, n = 15和n = 14, 6 +/- 3和4 +/- 1年训练）和未训练（UT, n = 14和n = 49）男性的肘关节屈肌（EF，实验1）和膝关节伸肌（KE，实验2）最大复合动作电位（M-max）振幅，并检查了最大自主扭矩（MVT）产生过程中肌电（EMG）正常化对LTRT和UT差异的影响。记录EF和KE的多个部位和肌肉肌电图，经皮神经刺激诱发M-max，并通过超声（厚度，EF）和磁共振（横截面积，KE）评估肌肉大小。测量肌肉电极距离（MED）来解释脂肪组织对肌电图和M-max的影响。LTRT表现出更大的MVT （- 66%-71%, P < 0.001）、肌肉大小（= 54%-56%,P < 0.001）和M-max幅度（- 29%-60%,P < 0.001）
This study compared elbow flexor (EF; experiment 1) and knee extensor (KE; experiment 2) maximal compound action potential (M-max) amplitude between long-term resistance trained (LTRT; n = 15 and n = 14, 6 +/- 3 and 4 +/- 1yr of training) and untrained (UT; n = 14 and n = 49) men, and examined the effect of normalizing electromyography (EMG) during maximal voluntary torque (MVT) production to M-max amplitude on differences between LTRT and UT. EMG was recorded from multiple sites and muscles of EF and KE, M-max was evoked with percutaneous nerve stimulation, and muscle size was assessed with ultrasonography (thickness, EF) and magnetic resonance imaging (cross-sectional area, KE). Muscle-electrode distance (MED) was measured to account for the effect of adipose tissue on EMG and M-max. LTRT displayed greater MVT ( - 66%-71%, P < 0.001), muscle size (= 54%-56%, P < 0.001), and M-max amplitudes (- 29%-60%, P