Morris Amanda J, Christie Anita D
Department of Human Physiology, University of Oregon, Eugene, OR 97401, USA.
School of Kinesiology, Western University, London, ON N6A 3K7, Canada.
Brain Sci. 2020 Mar 25;10(4):191. doi: 10.3390/brainsci10040191.
The purpose of this study was to examine the effect of a mentally fatiguing task on neuromuscular function in young and older women. Neuromuscular measures were obtained prior to and following 20 minutes of a mentally fatiguing task. Maximal force output significantly decreased after the mental fatigue task ( = 0.02) and this was not different between age groups ( = 0.32). Increases in cortical silent period duration approached significance in both young and older groups ( = 0.06), suggesting that mental fatigue may cause increased cortical inhibition. Measures of peripheral neuromuscular function (contractile properties of the muscle, M-wave) did not change ( 0.09), suggesting that changes in force production with mental fatigue are more likely due to supraspinal than peripheral mechanisms. These findings provide further evidence of an interaction between mental fatigue and physical function.
本研究的目的是检验一项精神疲劳任务对年轻和年长女性神经肌肉功能的影响。在进行20分钟精神疲劳任务之前和之后获取神经肌肉测量数据。精神疲劳任务后最大力量输出显著下降（P = 0.02），且各年龄组之间无差异（P = 0.32）。年轻组和年长组的皮质静息期时长增加均接近显著水平（P = 0.06），表明精神疲劳可能导致皮质抑制增强。外周神经肌肉功能指标（肌肉收缩特性、M波）未发生变化（P > 0.09），这表明精神疲劳导致的力量产生变化更可能是由于脊髓上机制而非外周机制。这些发现为精神疲劳与身体功能之间的相互作用提供了进一步的证据。
