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首页> 外文期刊>Scandinavian journal of medicine & science in sports. >Effects of acute isometric resistance exercise on cervicomedullary motor evoked potentials
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Effects of acute isometric resistance exercise on cervicomedullary motor evoked potentials

机译：急性等距耐药运动对颈椎测井电机诱发电位的影响

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摘要

Cervicomedullary motor evoked potentials ( CMEP s) in relaxed biceps brachii have been reported to facilitate after acute isometric exercise of the elbow flexors. This facilitation, which reflects either enhanced corticospinal transmission or increased motoneurone excitability, has only been documented in the limb posture used during exercise. In Experiment 1, we tested if these spinal changes “transfer” to a second posture. Fourteen individuals completed 12 sets of high‐force isometric contractions of the elbow flexors with the forearm pronated. Before and after exercise, biceps CMEP s were acquired with the forearm either pronated or supinated. CMEP s in pronation and supination were facilitated after exercise, indicating transfer (57.5?±?55.5% and 53.9?±?54.9%, respectively; mean?±? SD ). In Experiment 2, we examined if exercise posture influences the effect that exercise has on CMEP s. A different sample of 14 individuals performed isometric exercise in 2 sessions. In one, exercise was performed in supination. In the other, exercise was performed in pronation. Exercise intensity and volume were the same as in Experiment 1, as were participant characteristics. CMEP s were unchanged after exercise in supination (13.6?±?31.2%) and pronation (7.7?±?41.5%). The absence of an effect differs from the finding of Experiment 1. Thus, effects of acute isometric resistance exercise on corticospinal transmission and/or motoneurone excitability are not as consistent as previously thought. When exercise induces this spinal change, the effect is not specific to the posture used for exercise. However, the change does not always occur, and the reasons for this remain unknown.
机译：据报道，颈椎测井电机诱发电位（CMEP S）在肘部屈肌的急性等距运动后促进。这种促进，其反映了增强的皮质脊髓传播或增加的运动神经酮兴奋性，仅在运动期间使用的肢体姿势中记录。在实验1中，我们测试如果这些脊柱改变为第二个姿势。十四个个人用前臂合成完成肘部屈肌的12套高力等距收缩。在运动之前和之后，使用前臂垂直或纯于前臂进行二头肌CMEPs。在运动后促进CMEP S，表明转移（57.5？±55.5％和53.9？±54.9％;平均值？±αSD）。在实验2中，我们检查了运动姿势是否影响了在CMEP中的效果。 24个个体的不同样本在2个会议中进行了等距运动。在一个中，运动以索取进行。另一方面，在校展时进行锻炼。运动强度和体积与实验1中的相同，与参与者特征一样。在脱索后，CMEP S保持不变（13.6？±31.2％）和校牙（7.7？±41.5％）。缺乏效果与实验1的发现不同。因此，急性等距抗性运动对皮质脊髓透射和/或运动神经酮兴奋性的影响不如以前认为的那样一致。运动诱导这种脊柱变化时，该效果并不特异于用于运动的姿势。但是，并不总是发生变化，并且仍然未知的原因。

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