muscle contraction


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muscle contraction

The movement of muscle fibres in response to force or load. 

Muscle contraction types 
• Concentric—The muscle shortens in length as it overcomes resistance.
• Eccentric—The muscle increases in length to accommodate resistance.  
• Isometric—The muscle resists outside stress without exhibiting motion.
References in periodicals archive ?
In response to heat, mutations in RYR1 cause excessive amounts of calcium to leak from the storage compartment and trigger uncontrolled muscle contractions. The team found that AICAR reduces calcium leakage from RYR1, thus diminishing heat-induced contractions, muscle damage, and death.
Although there are no studies that tackle the effects of Cobra energy drink on muscle contraction and fatigability, Cobra energy drink contains mainly caffeine yet other ingredients are B vitamins, taurine, and ginseng, which are said to improve muscle performance.
To investigate the potential impact of topiramate on muscle contraction, phrenic nerve-hemidiaphragm preparations were used as an NMJ model and the effects of topiramate and phenytoin (as a control) on the muscle twitch response to electrical stimulation were comparatively evaluated.
We have proposed the extended application of a force sensing device to be used in the measurement of muscle contraction and movement, In principle the MOS act as an optical sensor to measure and detect changes of the wavelength that leads to the refractive index change and optical path length, where the contraction or deformation of the muscle is directly perturbed into the sensing unit, which affects a optical path length changes.
The present study investigated the effect of modified Shaker exercise on pharyngeal muscle contraction using cervical auscultation.
For instance, FA translocase (also known as cluster of differentiation 36, CD36), which translocates from cytoplasm to plasma membrane in specialized vesicles, is able to relocate in response to muscle contractions [34].
Muscle fatigue occurred when the subject was unable to maintain force during a sustained muscle contraction. Our work showed that RMS was larger at fatigue, and MDF and SampEn were smaller in comparison with nonfatigue status.
The onset of muscle contraction and to achieve the final relaxation there are the following successive stages:
The intensity of the sensory level was determined by increasing this parameter up to the observation of muscle contraction, when it was reduced below the level of contraction (20).
SentioMMG smart-sensors employ accelerometer technology to sensitively measure when muscle contraction occurs, as a means to alert surgeons of motor nerve location.
Posture expert Dr Steven Weiniger says: "Prolonged sitting results in lack of muscle contraction, which leads to less glucose burned resulting in surplus blood sugar which contributes to diabetes as well as other significant health risks.
For a mean frequency of 191 Hz, this is an approximate 0.5% jitter, which is quite normal in voice production and can be attributed to irregularity in muscle contraction. The variation of the vibrato-cycle average [F.sub.0] is slightly greater, attributable to the fact that the singer had not settled into a steady vibrato, perhaps by choice.