Takarada Yudai, Nozaki Daichi
Faculty of Sports Sciences, Waseda University, Saitama 359-1192, Japan.
Graduate School of Education, The University of Tokyo, Tokyo 113-0033, Japan.
Heliyon. 2024 Oct 30;10(21):e39762. doi: 10.1016/j.heliyon.2024.e39762. eCollection 2024 Nov 15.
Maximal voluntary force is known to be enhanced by shouting during sustained maximal voluntary contraction (MVC) via the enhancement of motor cortical excitability. However, whether excitatory input to the primary motor cortex from areas other than the motor-related cortical area induces muscular force-enhancing effects on the exertion of sustained maximal force remains unclear. Therefore, by examining motor evoked potentials to transcranial magnetic stimulation during sustained MVC and assessing handgrip force, the present study aimed to investigate the effects of subliminal goal-priming with motivational rewards on the state of the motor system. The findings revealed that when combined with rewards in the form of a consciously visible positive stimulus, barely visible priming of an action concept increased the maximal voluntary force and reduced the silent period (i.e., reduced motor cortical inhibition). To our knowledge, this is the first study to report a link between the muscular force of subliminal reward-goal priming during MVC and the enhancement of motor system activity through subliminal reward-goal priming operating on the motor system, possibly through the potentiation of activity of the reward-linked dopaminergic system.
众所周知，在持续最大自主收缩（MVC）过程中，通过增强运动皮层兴奋性，呼喊可增强最大自主力量。然而，除运动相关皮层区域外，其他区域对初级运动皮层的兴奋性输入是否会在持续最大力量的发挥中诱导肌肉力量增强效应仍不清楚。因此，本研究通过在持续MVC期间检查经颅磁刺激的运动诱发电位并评估握力，旨在探究带有动机奖励的阈下目标启动对运动系统状态的影响。研究结果显示，当与有意识可见的积极刺激形式的奖励相结合时，几乎不可见的动作概念启动增加了最大自主力量并缩短了静息期（即减少了运动皮层抑制）。据我们所知，这是第一项报告MVC期间阈下奖励目标启动的肌肉力量与通过作用于运动系统的阈下奖励目标启动增强运动系统活动之间联系的研究，这种联系可能是通过增强与奖励相关的多巴胺能系统的活动实现的。
