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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 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 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.
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.
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 ...
Standing or sitting, drop your right ear toward your right shoulder and feel a stretch in the left side of the neck. Hold for 2-4 breaths, and then release and switch sides. Chin to chest stretch
A yawn is a reflex in vertebrate animals characterized by a long inspiratory phase with gradual mouth gaping, followed by a brief climax (or acme) with muscle stretching, and a rapid expiratory phase with muscle relaxation, which typically lasts a few seconds.
[2] [4] If this is insufficient for treating vasovagal syncope, medications such as midodrine or fludrocortisone may be tried. [4] Occasionally, a cardiac pacemaker may be used as treatment. [2] Reflex syncope affects at least 1 in 1,000 people per year. [1] It is the most common type of syncope, making up more than 50% of all cases. [2]