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Similarly, the higher the contraction velocity, the lower the tension in the muscle. This hyperbolic form has been found to fit the empirical constant only during isotonic contractions near resting length. [1] The muscle tension decreases as the shortening velocity increases. This feature has been attributed to two main causes.
In such cases, classical force-length (constant velocity) or force-velocity (constant length) experiments are not sufficient to fully explain muscle function. [5] In 1960, the work loop method was introduced to explore muscle contractions of both variable speed and variable force.
In concentric contraction, muscle tension is sufficient to overcome the load, and the muscle shortens as it contracts. [8] This occurs when the force generated by the muscle exceeds the load opposing its contraction. During a concentric contraction, a muscle is stimulated to contract according to the sliding filament theory. This occurs ...
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Fused tetanus is when there is no relaxation of the muscle fibers between stimuli and it occurs during a high rate of stimulation. [5] A fused tetanic contraction is the strongest single-unit twitch in contraction. [6] When tetanized, the contracting tension in the muscle remains constant in a steady state. This is the maximal possible ...
Contraction of muscle under isometric conditions results in a muscle belly displacement. A tensiomyography sensor is connected to a computer running specially designed software that records displacement of sensor tip during the test and shows results on software interface in real time.
In that study, an increase in muscle fiber conduction velocity was observed when there was a higher level of voluntary muscle contraction, which agrees with the gradual recruitment of higher-force muscle types. [16] In Wistar rats, it was found that cell size is the crucial property in determining neuronal recruitment. [17]
These sites were hypothesized to be a focal region for delivery of tension during muscle contraction. To test the possibility of tensile force transmission via the perimysium, it was experimentally shown that cutting of the aponeurosis in a pennate muscle did not prevent tension generation further along towards the tendon. [6]