Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Japan.
Hum Mov Sci. 2011 Dec;30(6):1260-71. doi: 10.1016/j.humov.2010.08.006. Epub 2011 Jul 28.
This study investigated whole-body sensorimotor synchronization (SMS) in street dancers and non-dancers. Two kinds of knee bending movement in a standing position to a metronome beat were explored in terms of stability under different movement frequencies: down-movement condition (knee flexion on the beat) and up-movement condition (knee extension on the beat). Analyses of phase relation between movement and beat revealed several distinct differences between the down- and up-movement conditions, and between dancers and non-dancers. In both groups under the up-movement condition, deviation from intended phase relation at higher beat rates, and enhanced fluctuations were observed. The deviation from intended phase relation under up-movement condition, and movement fluctuations were greater in non-dancers than in dancers. Moreover, subjective difficulty rating revealed that both groups felt that the up-movement condition was more difficult at higher beat rates. These findings suggest that down and up movements are two distinguishable coordination modes in whole-body coordination, and that street dancers have superior whole-body SMS ability.
本研究调查了街头舞者和非舞者的全身感觉运动同步（SMS）。在不同的运动频率下，研究人员探索了两种站立姿势下的膝盖弯曲运动，即向下运动条件（膝盖在节拍上弯曲）和向上运动条件（膝盖在节拍上伸展），以研究其稳定性。对运动与节拍之间相位关系的分析揭示了在向下和向上运动条件之间，以及在舞者和非舞者之间存在几个明显的差异。在两组的向上运动条件下，观察到在更高的节拍率下偏离预期相位关系和增强的波动。非舞者的偏离预期相位关系以及运动波动大于舞者。此外，主观难度评分显示，两组人都认为在更高的节拍率下，向上运动条件更具难度。这些发现表明，向下和向上运动是全身协调中两种可区分的协调模式，并且街头舞者具有卓越的全身 SMS 能力。
