DIFFERENCES IN TRUNK KINEMATICS AND GROUND REACTION FORCESBETWEEN OLDER AND YOUNGER ADULTS DURING LIFTING

摘要

Trunk kinematics, ground reaction forces, and the mo motion of the center of pressure (COP) of olderand younger subjects were compared in lifting to study age-related differences between the twoage groups. Ten older (55 ～ 63 years old) and ten younger (19 ～ 29 years old) adults performedlifting tasks under six different conditions; three destination heights and two asymmetry angles oforigin. Subjects' trunk kinematics, ground reaction forces and COP motions were measured bythe Lumbar Motion Monitor (LMM) and a force plate. Older subjects showed significantly lesstrunk kinematics, peak ground reaction forces, and COP motions than younger subjects,ns indicating older subjects chose more stable lifting strategy and it might compensate for thedecreased ability of postural control over age. Less ground reaction forces and motion of COPsuggested that risks of falls and slips of older subjects were less than younger subjects.