Time needed to change the isometric force production of a response
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ABSTRACT:
This study investigated the time needed to change a motor program that specified the elbow flexor muscles to gradually increase the isometric force production from 15 percent to 75 percent of one's maximum voluntary contraction (MVC). A double-stimulation paradigm was used with the restriction that subjects (N = 12) be at 15 percent of their MVC before the presentation of the first stimulus. Subjects reacted to the first stimulus (randomly presented) by gradually increasing their isometric force from 15 percent to 75 percent of their MVC and then reacted to the second stimulus by altering the force production in one of four ways: (a) increasing the force to the 75 percent level rapidly instead of gradually, (b) discontinuing the increase and maintaining the level of force attained, (c) discontinuing all force production, or (d) reversing the direction of force so that it is produced by the elbow extensors. The data revealed that more time was needed to increase the force rapidly than to perform any of the other three conditions.
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