Abstract
Data on the maximal speed and reaction latency of limb movements, and the strength and effective mass of these limbs measured in the movement position, were obtained on 70 college men. Individual differences in all measures were highly reliable. Computation of r2 and k2 from the intercorrelations reveals that almost without exception the individual differences tend to be highly specific to the particular limb, its direction of movement, and a particular element of the limb action, i.e., strength or speed or reaction latency. The average scores, standard deviations, and the correlation matrix for both functional and anthropometric measurements are included in the report.

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