Jenbrassik Maneuver Case Study

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1. The Jendrassik maneuver is when a patient pulls their hands in opposite directions and clenches their teeth while someone hits the patellar tendon with a reflex hammer. This then causes the quadriceps muscle to contract, causing the leg to jerk up. The Jendrassik maneuver elicits a greater magnitude and longer quadriceps stretch reflex than if the maneuver was not in use. This phenomenon is caused because the body is focused on the upper body extremities at work, so it distracts the body from consciously tensing your leg in anticipation of the reflex hammer. This would be visible on an EMG because the magnitude and length of the reflex would greater than when the maneuver is not in use. Therefore, you will see the reflex lasting longer

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