Biceps femoris

The biceps femoris (short head) is a knee flexor, so its extensibility should be tested during a knee extension.

Test: The subject is on his abdomen to place the hips in a neutral position, diminishing the involvement of the bi-articular portion of the hamstrings. The starting position is fully flexed at the knees and the coach induces a slow knee extension. It is important that this be a passive action, in any extensibility test the subject should never contract any muscle.

Results: An athlete with normal extensibility will have the legs fully extended at the knees without any problems. Hypo-extensibility is spotted if the extension at the knees is incomplete. Hyper-extensibility is spotted if there is hyperextension at the knees.

Biceps Femoris Action Potential
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