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The patellar reflex, also called the knee reflex or knee-jerk, is a stretch reflex which tests the L2, L3, and L4 segments of the spinal cord. Many animals, most significantly humans, have been seen to have the patellar reflex, including dogs, cats, horses, and other mammalian species.
The stretch reflex (myotatic reflex), or more accurately "muscle stretch reflex", is a muscle contraction in response to stretching a muscle. The function of the reflex is generally thought to be maintaining the muscle at a constant length but the response is often coordinated across multiple muscles and even joints. [ 1 ]
The body varies the stiffness of its limbs by three primary mechanisms: muscle cocontraction, [1] [8] [9] posture selection, [6] and through stretch reflexes. [ 1 ] [ 10 ] [ 11 ] [ 12 ] Muscle cocontraction (similar to muscle tone ) is able to vary the stiffness of a joint by the action of antagonistic muscles acting on the joint.
Sitting for excessive periods of time can be harmful to your health, so experts recommend being intentional about incorporating some movement every 30 minutes to every hour or so without stressing ...
Taking breaks from sitting every 30 to 60 minutes and moving throughout the day is recommended for everyone, including those who exercise regularly. Sitting still for more than an hour to 90 ...
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For example, after a fracture when immobilization is done by casting the limb in plaster of paris, the muscle length shortens because the muscle is not used for a large span of time. A common cause for having the ankle lose its flexibility in this manner is from having sheets tucked in at the foot of the bed when sleeping.
But taking just a few minutes to stretch can make a world of a difference. ... Butterfly stretch. Sit on the floor. Bend both knees out to the side, bringing the bottom of your feet to meet each ...