Changes in Strength, Speed, and Reaction Time Induced by Simultaneous Bilateral Muscular Activity

Publisher Summary This chapter discusses deficit phenomena observed when humans perform simple simultaneous bilateral motor tasks and describes the possible causes of the phenomena. It presents the studies that report the deterioration of motor performance induced by bilateral simultaneous exercise, that is, bilateral deficit. It discusses the possible causes of the phenomenon. The bilateral deficit in voluntary strength has also been observed for submaximal isometric hand grip, elbow flexion, and extension strength. The speed of movement execution reduces when both limbs are moved simultaneously. From a practical viewpoint, it is interesting that when one tries to activate multiple units of the body, the performance capacity of each unit declines. The chapter focuses on the same level of maximal and submaximal exercise performed bilaterally and simultaneously.

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