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. Author manuscript; available in PMC: 2008 Nov 6.
Published in final edited form as: J Biomech. 2007 Aug 17;40(16):3725–3731. doi: 10.1016/j.jbiomech.2007.06.024

TABLE 1.

Maximum anterior hip joint forces using different percentages of maximum muscle force. The maximum hip force occurs at the greatest hip extension angle, 20° for prone hip extension, and 10° for supine hip flexion. For both exercises, the maximum anterior force increases with decreasing force contribution from specific muscles. Condition 1 is 100%, 2 is 50%, 3 is 25%, and 4 is 5% of the maximum isometric force for the gluteal (hip extension) and iliopsoas (hip flexion) muscles.

Condition
Exercise Variable 1 2 3 4
Prone hip extension Maximum anterior hip joint force (N) 217.1 226.8 241.2 369.7
Percent increase from Condition 1 (%) N/A 4.5 11.1 70.3
Supine hip flexion Maximum anterior hip joint force (N) 90.6 136.3 178.3 203.0
Percent increase from Condition 1 (%) N/A 50.5 96.8 124.1