Joint Moment and Mechanical Power Flow of the Lower Limb During Vertical Jump

Int. J. Sports Med. 8 (1987) 15-21 Supplement

The figure of Appendix 1 and three equations should read as follows:

1. Fax = max - Fx

2. Fay = may - Fy + mg

3. ΣM = Iα
   Ma+(Fx·R)+(Fy·Q)-(Fay·L)-(Fax·N) = Iα
   ∴Ma = -(Fx·R)-(Fy·Q)+(Fay·L)+(Fax·N)+Iα

Fax, Fay = joint reaction force

Ma = moment of the joint

Fx, Fy = ground reaction force

ax, ay = acceleration of the center of segment

m = segment mass

g = gravity due to acceleration

I = inertia moment of the segment

α = angular acceleration of the segment

L,N,Q,R = distance