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During this silent period, what structures are likely to be producing trunk extension torque? Is this...

During this silent period, what structures are likely to be producing trunk extension torque? Is this torque being generated actively or passively?

Science   Anatomy-And-Physiology   
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It is suggested that during the silent period, passive structures are bearing all the load which is why there is no muscle EMG signals, ligaments, facia and facet joint capsule bear the entire load of slight hip flexion.

At full flexion, the Quadratus and lumborum and deeper muscles became more active

This look at the force length relationship where at greater stretch muscles can't create as much force. However passive structures generate greater force and greater length/ stretch

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