Figure 1. Joint angle conventions - right hand side of body only (H = hip, K = knee).
In addition, various hip and knee joint angular measures were determined for each step (Figure 1). Values for hip and knee extension were calculated at the instance of toe-off for the first and third steps (right foot toe-off). Joint range of motion (ROM) for the hip and knee were calculated using the difference between highest and lowest extension values during a step (steps 1 and 3). Average hip and knee angular velocities were calcula ted by dividing the ROM by the time taken to achieve that ROM (steps 1 and 3).
Murphy, A. J., Lockie, R. G., & Coutts, A. J. (2003). Kinematic determinants of early acceleration in field sport athletes. Journal of Sports Science and Medicine, 2(4), 144-150. ##00038
Full paper (PDF).Notes:
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