Cappozzo A
J Biomech. 1982;15(8):599-609. doi: 10.1016/0021-9290(82)90071-9.
An assessment was made of the upper body low frequency steady-state vibration in five normal male subjects during level walking in a straight line. Speed of progression ranged from 0.99 to 2.35 m/s. Through a stereophotogrammetric technique, a three-dimensional measurement of the linear displacement of the longitudinal axis of the trunk and head was done. The relevant accelerations were obtained by double differentiation and described both in the time and frequency domains. The data were compared with those available on the biodynamic properties of body tissues and on the subjective response of humans to externally generated whole-body vibration. The comparison yielded a consistent indication of the characteristics of the vibration stimulus to which the human body may be adapted. As walking speed approached its maximum, the vertical acceleration spectrum increased in magnitude and shifted critically close to frequencies at which body organs are known to undergo resonance. A coordinated movement of the trunk with respect to the pelvis helped to reduce to a minimum the value of the acceleration to which the head was submitted in the antero-posterior direction and to shift the relevant spectrum towards the lower frequencies.
对五名正常男性受试者在直线水平行走过程中的上身低频稳态振动进行了评估。行进速度范围为0.99至2.35米/秒。通过立体摄影测量技术，对躯干和头部纵轴的线性位移进行了三维测量。相关加速度通过二次微分获得，并在时域和频域中进行描述。将这些数据与人体组织生物动力学特性以及人体对外部产生的全身振动的主观反应的现有数据进行了比较。比较结果一致表明了人体可能适应的振动刺激的特征。当行走速度接近最大值时，垂直加速度谱的幅度增加，并急剧移向已知身体器官会发生共振的频率。躯干相对于骨盆的协调运动有助于将头部在前后方向上所承受的加速度值降至最低，并将相关频谱移向较低频率。
