Search results
Results from the WOW.Com Content Network
One basic function of EMG is to see how well a muscle can be activated. The most common way that can be determined is by performing a maximal voluntary contraction (MVC) of the muscle that is being tested. [16] Each muscle group type has different characteristics, and MVC positions are varied for different muscle group types.
A subject’s maximum voluntary contraction (MVC) is recorded and used to normalize both reference forces and results between subjects. [1] During the test subjects are assisted in producing a reference force using various types of feedback (static weight or visual display of force generated).
In 1993, isometric exercise training was applied for four weeks resulting in isometric peak power at 60% of maximal voluntary contraction. [5] The increase in isometric power was later shown to have no significant effect on serum creatine kinase (CK) after two weeks of strength training. [6]
It is able to be measured using electromyography (EMG) from the contractions that occur. The general mechanism of it is still widely unknown. It is believed to be important in joint stabilization, as well as general motor control. [1] Coactivation of biceps and triceps. The biceps’ EMG is on top, while the triceps’ EMG is on the bottom.
The rate at which the nerve impulses arrive is known as the motor unit firing rate and may vary from frequencies low enough to produce a series of single twitch contractions to frequencies high enough to produce a fused tetanic contraction. Generally, this allows a 2 to 4-fold change in force.
In research studies, participants were found to show reduced voluntary force production in fatigued muscles (measured with concentric, eccentric, and isometric contractions), vertical jump heights, other field tests of lower body power, reduced throwing velocities, reduced kicking power and velocity, less accuracy in throwing and shooting ...
To test the reflex, the muscle should be in a neutral position. The muscle being tested needs to be flexed for the clinician to locate the tendon. After the muscle is relaxed, the clinician strikes the tendon. The response should be contraction of the muscle. If this is the knee jerk reflex, the clinician should observe a kick.
The supra-maximal stimulation is regarded as corresponding to a minimal stimulation and it determines maximum amplitude of muscular deformation, recorded as Dm. [ 6 ] Contraction time of muscle belly response to twitch stimulation for ED (fast muscle) and GCM (slow muscle) measured by tensiomyography.