Abstract
We hypothesized that based on previous reports, several COP parameters would differ based on balance ability in healthy adults. The aim of this study was to examine the feasibility of balance assessment in healthy adults based on quantitative COP measurements.
Fifty three healthy adults were classified into superior, average and inferior groups based on their performances in the one-legged stance (OLS) test with closed eyes. COP was measured three times during OLS for 120 s. Participants were instructed to stand on one foot for 90 s after maintaining an upright stance on both feet for 30 s. There was a significant difference in the standard deviations of medial-lateral directions COP trajectory during the static phase (the last 10 s). Plantar flexor muscle strength was significantly related to COP parameters in the dynamic phase of OLS.
The amplitude of medial-lateral COP sway differs between young adults of different balance abilities. Dorsal and plantar flexor muscle strength contributes to postural steadiness just after shifting stance from two-legged to one-legged. However, they play a small role in the maintenance of previously stabilized posture. Balance ability may be assessed by measurement of the amplitude of medial-lateral COP sway in the static phase.
