School of Physical Therapy, Chung Shan Medical University, Taichung, Taiwan.
Med Sci Sports Exerc. 2011 Sep;43(9):1707-15. doi: 10.1249/MSS.0b013e318213f262.
The study was undertaken to investigate the contralateral overflow effect on physiological tremors in pianists and nonmusicians. Group differences in cross modulation on underlying finger fractionated movement were characterized.
Physiological tremors of the right index, middle, ring, and little fingers were recorded in 12 right-handed pianists and 12 matched nonmusician controls; meanwhile, two contralateral resistance protocols (unilateral handgrip using the left hand at slight and maximal efforts) were randomly conducted.
Digit tremors of the control and pianist groups were differentially modulated with the resistance protocols. An increase in gripping force led to cross excitations over 8-12 Hz digit tremors and interdigit tremor coupling for the nonmusicians. An opposite cross effect was noted for the pianists, who exhibited significant tremor suppression and the release of interdigit tremor coupling. Further analysis of tremor dynamics revealed that contralateral gripping reduced the complexity of digit tremors of the pianists but added to the tremor complexity of the nonmusicians.
Cross modulation on digit tremors suggests that pianists could centrally suppress unintended motor excitation across the midline. When the opposite hand is active, pianists have superior finger independence that allows them to achieve artistic aspects of musical performance.
本研究旨在调查钢琴家和非音乐家的生理震颤的对侧溢出效应。对底层手指分运动的交叉调制的组间差异进行了特征描述。
记录了 12 名右利手钢琴家和 12 名匹配的非音乐家对照者右手食指、中指、环指和小指的生理震颤；同时，随机进行了两种对侧阻力方案（左手轻微和最大力度的单侧握力）。
对照组和钢琴家组的手指震颤随阻力方案而不同地调制。紧握力的增加导致非音乐家的 8-12 Hz 手指震颤和指间震颤耦合的交叉兴奋。而钢琴家则表现出相反的交叉效应，表现出显著的震颤抑制和指间震颤耦合的释放。对震颤动力学的进一步分析表明，对侧握持降低了钢琴家手指震颤的复杂性，但增加了非音乐家的震颤复杂性。
手指震颤的交叉调制表明，钢琴家可以在中枢抑制中线对侧的不随意运动兴奋。当对侧手活跃时，钢琴家具有更高的手指独立性，使他们能够实现音乐表演的艺术方面。
