Effect of Ageing on Quadriceps Muscle Strength and on the Forward Shift of Center of Pressure during Sit-to-stand Movement from a Chair - KEI MIYOSHI; TEIJI KIMURA; YOSHIHARU YOKOKAWA; GOH AH CHENG; TAKAYUKI FUJIWARA; IWAO YAMAMOTO; YOSHIYUKI KONDO (Journal of Physical Therapy Science, 2005)