| Popis: |
Measuring center of foot pressure (COP) in motion might be more useful than only doing static COP to evaluate postural control. Active knees movements were applied to study COP with aging. Shifts and oscillation of COP were discussed in relation to age, body weight and height for 95 volunteers. Informed consent was obtained from them after fully explanation about this study. They had no past history of vestibular diseases. The subjects on a force plate were asked to stand upright for 5 sec, flex knees at an angle about 90 degrees as they could and keep knees flexed for 9.5 sec and extend knees to stand upright for 5 sec. Vertical, medial-lateral, anterior-posterior COP were tested. Medial-lateral shifts significantly correlated to age, and medial-lateral oscillation increased with aging. Anterior-posterior shifts in flexing knees correlated negatively to age, but anterior-posterior shifts at knees flexed correlated positively to age. Vertical shifts did not correlate to age, but they correlated to weight both in flexing and flexed knees, and anterior-posterior shifts correlated to weight in flexing knees. Both vertical and anterior-posterior shifts correlated to height in flexing knees. COP shifted anterior in knee-flexion. Oscillation about 2 Hz increased during flexed knees in the vertical direction. |
