Relationship between range of motion of the spinal column and mechanics characteristic at the compensatory stepping reaction in the elderly

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The purpose of this study was to investigate relations with the deflection characteristic of the body center of mass at landing of the backward stepping and the joint moment, and range of motion of the spinal column in the elderly.The results of this study showed a significant negative correlation between the amount of thebody center of mass and ankle plantar flexion moments in the elderly group. Furthermore, significant negative correlation was observed between the extension range of motion from the 11th thoracic vertebra to the 12th thoracic vertebra and deflection of the body center of mass at the landing phase of the backward stepping reaction.This study suggests that, for controlling deflection of the body center of mass at the landing phase, extension range of motion in the transition region between the thoracic vertebra and lumbar vertebrae take an important role.