How Strongly Is Muscle Activity Associated with Joint Moments?

in Motor Control

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Graham E. Caldwell
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Li Li
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In this commentary we question whether the relationship between muscle activity and joint moments is the same for natural motor tasks as for controlled experimental situations. An important consideration in this regard is the identification of the correct electromechanical delay (EMD) for comparing EMG and joint moment data. Data from recent cycling studies are used to illustrate the importance of EMD, and how changing task constraints can alter the relation between muscle activity and joint moment balance for bi-articular antagonist pairs.

G.E. Caldwell is with the Department of Exercise Science at the University of Massachusetts, Amherst, MA 01003. L. Li is with the Department of Kinesiology at Louisiana State University, Baton Rouge, LA 70803.

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