Budini Francesco, Mocnik Richard, Tilp Markus, Crognale Domenico
Institute of Human Movement Science, Sport and Health, University of Graz, Austria.
Institute for Sport & Health, University College of Dublin, Dublin, Ireland.
Heliyon. 2024 Jun 22;10(13):e33459. doi: 10.1016/j.heliyon.2024.e33459. eCollection 2024 Jul 15.
Hand postural physiological tremor increases during arithmetic computation. The present work aims at investigating whether this could be attributed to a raise in stress for having to provide a correct answer within a constrained period of time, or to voice vibration for having to speak to report the answer.
In 16 participants tremor was recorded by using a 3-axial accelerometer during 5 min of a hand postural task performed simultaneously while: 1) subtracting 13 from a 3-digit number within 4 s and with mistakes correction (intervention: math stress task), 2) same as for the "intervention task" but without time limit and mistakes correction (intervention: math nonstress task), 3) adding 1 to a 3-digit number (intervention: voice vibration task), and 4) only postural task while keeping quiet (control task). Electromyographic (EMG) activity from the extensor carpi radialis was measured during the hand postural task.
Compared to control, tremor increased during both math interventions (+30.9 % p = 0.002, math stress; +15.0 % p = 0.01, math nonstress), but not during the voice vibration task (+12.2 % p = 0.239). During the math stress trial tremor was greater compared to both the voice vibration trial (+21.0 % p = 0.021), and the math nonstress trial (+13.5 % p = 0.01). EMG activity was not affected.
The results suggest that during arithmetic computation the "stress component" contributes only partially to the observed increase in hand postural tremor, and that this increase cannot be attributed to voice vibrations.
在算术运算过程中，手部姿势性生理震颤会增强。本研究旨在探究这是否可归因于在限定时间内必须给出正确答案所带来的压力增加，或者是由于必须出声汇报答案而产生的语音振动。
对16名参与者，在同时进行5分钟手部姿势任务期间，使用三轴加速度计记录震颤，任务如下：1）在4秒内从一个三位数中减去13并改正错误（干预：数学应激任务），2）与“干预任务”相同，但无时间限制且不改正错误（干预：数学无应激任务），3）给一个三位数加1（干预：语音振动任务），4）仅保持安静进行姿势任务（对照任务）。在手部姿势任务期间测量桡侧腕伸肌的肌电图（EMG）活动。
与对照相比，在两种数学干预期间震颤均增加（数学应激时增加30.9%，p = 0.002；数学无应激时增加15.0%，p = 0.01），但在语音振动任务期间未增加（增加12.2%，p = 0.239）。在数学应激试验中，震颤比语音振动试验（增加21.0%，p = 0.021）和数学无应激试验（增加13.5%，p = 0.01）时更大。EMG活动未受影响。
结果表明，在算术运算过程中，“应激成分”仅部分促成了所观察到的手部姿势性震颤增加，且这种增加不能归因于语音振动。
