The stretch reflex (myotatic reflex) is a muscle contraction in response to stretching within the muscle. It is a monosynaptic reflex which provides automatic regulation of skeletal muscle length. When a muscle lengthens, the muscle spindle is stretched and its nerve activity increases. This increases alpha motor neuron activity, causing the muscle fibers to contract and thus resist the stretching. A secondary set of neurons also causes the opposing muscle to relax. The reflex functions to maintain the muscle at a constant length. Gamma motoneurons regulate how sensitive the stretch reflex is by tightening or relaxing the fibers within the spindle. There are several theories as to what may trigger gamma motoneurons to increase the reflexs sensitivity. For example, alpha-gamma co-activation might keep the spindles taut when a muscle is contracted, preserving stretch reflex sensitivity even as the muscle fibers become shorter. Otherwise the spindles would become slack and the reflex would cease ...
TY - JOUR. T1 - Changes in Stretch Reflex Responses of Syhergistic Muscles During Different Muscle Contraction Modes. AU - S, Yamamoto. AU - S., Yamamoto. AU - K., Nakagawa. AU - H., Yano. AU - Yamamoto, Shinichirou. PY - 1996/4/1. Y1 - 1996/4/1. M3 - Article. VL - 98. SP - 50. EP - 51. JO - Journal of Electroencephalography and Clinical Neurophysiology. JF - Journal of Electroencephalography and Clinical Neurophysiology. ER - ...
Gamma motoneurons regulate how sensitive the stretch reflex is by tightening or relaxing the fibers within the spindle. There are several theories as to what may trigger gamma motoneurons to increase the reflexs sensitivity. For example, alpha-gamma co-activation might keep the spindles taut when a muscle is contracted, preserving stretch reflex sensitivity even as the muscle fibers become shorter. Otherwise the spindles would become slack and the reflex would cease to function. ...
This A Stretch Reflex and a Crossed Extensor Reflex Model Lesson Plan is suitable for 10th - 12th Grade. Students make moving models of a stretch reflex and of a crossed extensor reflex (using common materials found a hardware or craft store) to allolw them a better understanding of how relexes work.
Psychology Definition of STRETCH REFLEX: is a muscular contraction in response to some muscular stretch in the same muscle. Read also about extensors thrust.
The stretch reflex; which is also often called the myotatic reflex, knee-jerk reflex, or deep tendon reflex, is a pre-programmed response by the body to a stretch stimulus in the muscle. When a muscle spindle is stretched an impulse is immediately sent to the spinal cord and a response to contract the muscle is received. Since the impulse only has to go to the spinal cord and back, not all the way to the brain, it is a very quick impulse. It generally occurs in 1-2 milliseconds. This is designed as a protective measure for the muscles, to prevent tearing. The muscle spindle is stretched and the impulse is also immediately received to contract the muscle, protecting it from being pulled forcefully or beyond a normal range. The synergistic muscles, those that produce the same movement, are also innervated when the stretch reflex is activated. This further strengthens the contraction and prevents injury. At the same time, the stretch reflex has an inhibitory aspect to the antagonist muscles. When ...
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This article will discuss the stretch reflex, the anatomy that underpins it as well as the clinical relevance. Learn this topic now at Kenhub.
As a muscle is stretched the muscle fibres elongate. Once the muscle fibres elongate to their maximum limit, further stretching forces the collagen fibres in the surrounding connective tissue to align themselves along the line of force. This helps to realign the disorganised fibres and is the basis behind the rehabilitation of scar tissue.. When the muscle is stretched, stretch receptors, the specialized nerve endings present in the muscles and tendons, send signals to the brain initiating "the stretch reflex", a protective reflex to counter the increase in muscle length by causing it to contract. The more sudden the stretching, the stronger the stretch reflex is. This reflex maintains muscle tone and reduces the risk of injury.. When the muscle is held in a stretched position for a long time, the nerves get accustomed to the new length and this diminishes the stretch reflex, allowing for greater lengthening of the muscle.. ...
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Video created by Duke University for the course Medical Neuroscience. We come now to another pivot in Medical Neuroscience where our focus shifts from sensation to action. Or to borrow a phrase made famous by C.S. Sherrington more than a ...
If you are suffering from back pain then the Spinal Stretch back pain relief system can help. It is recommended by doctors to relieve lower back pain and can potentially help avoid the need for surgery.
I am far from being an expert, but regarding hyperreflexia: What was your grading of myotatic reflexes upon tapping muscle tendon? If it was just 3+ (i.e. brisk response, without clonus) and if they were symmetric, this is still considered to be normal (and in fact a common finding in BFS patients, as few members already noted). Unless this new neuro detected some other UMN or LMN lesions (besides hyperreflexia and fasciculations), I find it highly surprising that he gave you a possible ALS diagnosis ...
Anyone else have red bumps on their stretch marks. My belly has been so itchy the last few days especially, since i cant see under my belly button I didnt notice ...
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The army has begun putting up walls of barbed wire on stretches running parallel to the Line of Control (LoC) in Jammu and Kashmir during a major counter-insurgency drive codenamed Operation Sarp Vinash carried out from April 20 to May 18. ... , Read.. ...
When the skin is tough or sagging, the pressure or weight makes it stretch a lot more than it should. This causes damage in the connective tissue and the skin tears and eventually scars. The result is the formation of stretch marks. There are treatments that can eliminate or reduce the appearance of stretch marks. However, there are good treatments as well as bad ones. We need to apply those that are safe effective.. There are different kinds of stretch marks. There are those that are easier to treat, which are the lightly colored ones. Then there are others that are reddish, purplish or pink in color and are bumpy in texture-these are naturally more difficult to treat. There are products today that are only designed to reduce the appearance of stretch marks and make them "blend in" more with the rest of the skin. However, these products do not target the core problem. Creams are most effective when they contain good ingredients. Components of whats "good" in a solution include "potent, natural ...
Stretch Marks Treatment Cream aimed at stretch marks treatment and stretch marks removal has ingredients that will reduce and prevent stretch marks. Learn more about stretch marks.
Diabetes can be a great teacher and a source of wisdom, a force that propels our lives forward in deeply fulfilling ways. We just have to listen.
As a CIO, risk and compliance management is one of your key performance improvement tools.  You should make it part of your everyday routine, whether looking for risks and issues in project steering committees or reviewing the status of your software licence compliance. 
How to Get Rid of Stretch Marks Fast. Stretch marks, or striae, develop when your skin suddenly needs to stretch beyond the limits of its natural growth rate. The middle layer of your skin breaks in places, causing the lower layers of your skin to show through. Active stretch marks tend to be red or purple, fading...
We have all heard of, seen and even fallen victim to stretch marks. Although they are unpleasant to look at, the question remains: what are stretch marks and how can they be treated? On this weeks YourCosmeticDoctor.tv video, Dr. Barry Lycka tells us all we need to know. What Are Stretch Marks? Stretch marks are…. Read More ...
We look at what stretch marks are, how they are formed, who is susceptible in getting stretch marks, what can and cant be done about them and look at certain herbs that can help prevent stretch marks and improve the appearance of formed stretch marks.
If you seek information on how to get rid of stretch marks, this hub is for you. Unsightly stretch marks can really make a person feel self-conscious about their body, and nobody wants that. Stretch marks come from the fine fibers in the outer layer...
Discover the 7 secrets of stretch mark removal. If you want to know how to remove stretch marks fast and cheap, then check this out now!
... requires patience and dedicated efforts. Learn about the ways to treat those stretch marks during post delivery period. These tips will surely help you to reduce the pregnancy stretch marks.
The key difference between the red and the white stretch marks is that red stretch marks are young while the red ones are mature stretch marks.
Want to know how to get rid of stretch marks fast and naturally? Here are 25 useful remedies that diminish and prevent stretch marks.
I work VERY part time. I will start doing a 6 hour shift on Saturdays. That will be my longest shift. If I feed or pump before leaving and pump even on my way home will that be OK for my supply? He is 3 months old and does NOT STTN so we dont do any long overnight stretches. So this would only be one day a week that I go a longer stretch. I dont mind pumping I just really dont like the idea of bailing on a coworker for a length of time to do so. It really isnt fair. All I have is
Stretch marks have long been a major aesthetic worry for both women and men. Were excited to introduce an effective treatment for striae, or stretch marks.
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Perform these 6 simple calf stretches can help reduce the chance having tight calf muscles that can cause you pain or discomfort in your calf muscles.
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Get more out of your cool down routine and kickstart recovery by including these stretches as part of your horses daily workout regimen.
Whether youre growing upwards or outwards, many men, women and teens develop annoying white or silvery stretch marks. But what causes these scars, and can you get rid of them?
However, there are some treatments & creams that can help minimize the appearance of old stretch marks new ones and help them to fade more quickly.
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How to Get Taller by Stretching. Looking to increase your height? Make yourself taller by doing specific stretches and exercises. Stretch yourself taller by doing these stretches before the plates in your bones fuse together sometime...
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No doubt route linework is missing for the stretch Phaselis-Atalia, as well as on to Sidi, because of the awkwardness of running it through such a tight space. The distance figure XLVII would surely have had to be placed below the linework ...
A reflex, or reflex action, is an involuntary and nearly instantaneous movement in response to a stimulus. A reflex is made possible by neural pathways called reflex arcs which can act on an impulse before that impulse reaches the brain. The reflex is then an automatic response to a stimulus that does not receive or need conscious thought. Myotatic reflexes The myotatic reflexes (also known as deep tendon reflexes), provide information on the integrity of the central nervous system and peripheral nervous system. Generally, decreased reflexes indicate a peripheral problem, and lively or exaggerated reflexes a central one.[citation needed] A stretch reflex is the contraction of a muscle in response to its lengthwise stretch. Biceps reflex (C5, C6) Brachioradialis reflex (C5, C6, C7) Extensor digitorum reflex (C6, C7) Triceps reflex (C6, C7, C8) Patellar reflex or knee-jerk reflex (L2, L3, L4) Ankle jerk reflex (Achilles reflex) (S1, S2) While the reflexes above are stimulated mechanically, the ...
Assessment of the Thyroid: Achilles Tendon Reflex (Woltmans Sign). Quotes by Ray Peat, PhD:. One of the oldest tests for hypothyroidism was the Achilles tendon reflex test in which the rate of relaxation of the calf muscle corresponds to thyroid functionthe relaxation is slow in hypothyroid people. Water, sodium, and calcium are more slowly expelled by the hypothyroid muscle. Exactly the same slow relaxation occurs in the hypothyroid heart muscle, contributing to heart failure, because the semi-contracted heart cant receive as much blood as the normally relaxed heart. The hypothyroid blood vessels are unable to relax properly, contributing to hypertension. Hypothyroid nerves dont easily return to their energized relaxed state, leading to insomnia, parasthesias, movement disorders, and nerves that are swollen and very susceptible to pressure damage.. The thyroid hormone keeps the cellular energy high, the adrenaline low, and reflexes strong. It undoubtedly has an important effect on both ...
Greater levels of bone ultimate fracture load, bone stress-strain index, muscle cross-sectional area, and maximal voluntary isometric plantarflexion (MVIP) strength of the lower leg may be adaptations from chronic exposure to stretch-shortening cycle (SSC) actions. Dancers, a population that habitually performs SSC movements primarily about the ankle joint, may serve as a novel population to gain broader understanding of SSC function. A total of 10 female collegiate dancers and 10 untrained controls underwent peripheral quantitative computed tomography scans of both lower legs and performed MVIPs, countermovement hops, and drop hops at 20, 30, and 40 cm on a custom-made inclined sled. Dancers had greater right and left ultimate fracture load values and significantly (P ≤ .05) greater left leg stress-strain index than controls. Dancers had significantly larger right and left muscle cross-sectional area and MVIP values and hopped significantly higher during all hopping conditions in comparison ...
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