Standing centre of pressure alters the vibration transmissibility response of the foot

Vibration-white foot as an occupational disease has underscored the need to better understand the vibration response of the foot. While vibration transmissibility data exist for a natural standing position, it is anticipated that weight distribution will affect the response. The purpose of this study was to determine the effects of changes in centre of pressure (COP) on the foot’s biomechanical response. Twenty-one participants were exposed to vertical vibration of 30 mm/s, with a sine sweep from 10–200 Hz. Z-axis (vertical) vibration was measured at 24 locations on the right foot, with the COP shifted forward or toward the heel. A mixed model analysis at each location revealed significant differences (p Practitioner Summary: Altering the centre of pressure location resulted in changes in the transmission of vibration through the foot. The forward lean position was associated with the greatest amplitude of vibration transmissibility at the toes. This information is relevant for clinicians studying vibration-induced white-foot and engineers designing protective equipment.振动性白足（Vibration-white foot）作为一种职业病，凸显了深入探究足部振动响应的必要性。尽管已有针对自然站立姿态的振动传递率研究数据，但学界普遍认为体重分布会对足部振动响应产生影响。本研究旨在明确压力中心（centre of pressure, COP）的变化对足部生物力学响应的影响。本研究招募21名受试者，使其接受30 mm/s的垂直振动刺激，振动信号为10~200 Hz的正弦扫频信号。研究人员在受试者右脚的24个点位测量Z轴（垂直）方向的振动，同时调整压力中心向前或向足跟移动。对每个点位开展混合效应模型分析后发现存在显著性差异（p）。从业者摘要：调整压力中心位置会改变足部的振动传递特性。前倾姿态下，脚趾处的振动传递率幅值达到最大。该研究结果可供研究振动性白足的临床医师以及设计防护装备的工程师参考。