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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 ]
Young adults in the U.S. reportedly sit about nine to 10 hours a day, compared to older adults, who sit up to 13 hours a day. And a lot of us know that sitting for long periods of time can be harmful.
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.
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 ...
An effective cool-down period should last between 5 and 10 minutes. During that time, string together 5-7 of these static stretches to get a deep stretch and loosen up your entire body as you ...
Experts suggest to move around and change positions throughout the day. It is best not to sit in one position for more than 20 minutes, or to stand in one position for more than 8 minutes. [17] If prolonged sitting in the workplace is required or desired, individuals should gradually transition to significant periods of standing. [18] When ...
A new study suggests that staying in a seated position for long periods of time can lead to a shortened lifespan.