How can the two-joint hip muscles affect this rhythm?
What will be an ideal response?
ANS:
Two-joint muscles can affect lumbopelvic rhythm by restricting the participation of one or more segments. For instance, if attempting to touch one's toes, the hamstrings (which are being passively stretched) may not lengthen sufficiently and will restrict anterior pelvic tilt and hip flexion. Similarly, the multijoint back extensors, which are also lengthening (passively or eccentrically), may restrict the amount of lumbar flexion that can be attained. In either instance, the total range of motion available to the forward bend would be reduced and the stress to the mobile segments increased.
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