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Depiction of smooth muscle contraction. Muscle contraction is the activation of tension-generating sites within muscle cells. [1] [2] In physiology, muscle contraction does not necessarily mean muscle shortening because muscle tension can be produced without changes in muscle length, such as when holding something heavy in the same position. [1]
An example of this is when a person steps on a nail: The leg that is stepping on the nail pulls away, while the other leg takes the weight of the whole body. [ 4 ] The crossed extensor reflex is contralateral, meaning the reflex occurs on the opposite side of the body from the stimulus.
Bridging exercises are done with a flexed knee to lessen the stretch on the hamstring (a knee flexor) and focus the hip extension work on the gluteus maximus. In that same respect, the reduced knee flexion makes plantar flexion work comparable to a seated calf raise, due to the lessened stretch on the gastrocnemius (like the hamstring, also a knee flexor).
What Are the Concentric and Eccentric Phases. Every exercise (squat, deadlift, bench press, curl, row, etc.) is comprised of two distinct phases: Concentric and eccentric. The concentric phase is ...
The concentric portion is usually the part of the exercise that you think of as “the lift”—it’s the pressing portion of a bench press, standing up out of a squat, pulling the bar from the ...
As the legs are used singly, and perform the same amount of work, the body and legs may be strengthened more evenly than bilateral plyometrics, which may involve one leg doing an excessively large amount of the work. Some forms of unilateral plyometrics involve a cyclic alternation between the legs e.g. repeatedly jumping from one foot to the ...
Since the length of the tendon increases due to the active stretch phase, if the series elastic component acts as a spring, it would therefore be storing more potential energy. This energy would be released as the tendon shortened.
The great utility of the isoinertial method and at the same time what makes it different from the normal isotonic muscle movement lies in the fact that the action isotonic developed in conventional exercises (strength machines and free weights), the resistance is constant throughout the whole of movement in both the concentric phase in which ...