Postural responses to yaw rotation of support surface.
The purposes of this study were to investigate EMG and kinematic responses to yaw rotation of a support surface. Twenty people participated in four conditions, i.e., two velocities (240°/s, 120°/s) and two amplitudes (30°, 15°). Longer latency and smaller muscle responses were induced for yaw rotation, and distal ankle and knee muscles were activated earlier than trunk and neck muscles. Joint kinematics demonstrated larger angular displacements in axial rotation. Velocity and amplitude did not affect onset latency or magnitude of muscle activation but had significant effects on joint movements and COM displacements. Preliminary information about normative data of healthy subjects was obtained, and questions were generated about optimal velocity and amplitude test protocols that require further investigation.
Institute of Biomedical Engineering, National Cheng Kung University, Tainan, Taiwan.
Chiung-Ling
CL
Chen
Shu-Zon
SZ
Lou
Hong-Wen
HW
Wu
Shyi-Kuen
SK
Wu
Kwok-Tak
KT
Yeung
Fong-Chin
FC
Su
D000704:Analysis of Variance; D001696:Biomechanical Phenomena; D004576:Electromyography; D005260:Female; D006185:Habituation, Psychophysiologic / Q000502:physiology; D006801:Humans; D008297:Male; D018482:Muscle, Skeletal / Q000502:physiology*; D004856:Postural Balance / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology; D012399:Rotation; D013499:Surface Properties; D055815:Young Adult