The genetic development of patterns of voluntary activity.

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Abstract
Using muscular action potentials a comparison was made of intensity and spread of muscular action in adults and 9-yr.olds lifting wts. of 50-100 g. Rest-level activity was greater in children and remained so despite decline on 2d sitting. Activity of muscle directly engaged in lifting was considerably greater in children, and inversely proportional to cross-sectional area of muscle. Remote activity (contra-lateral extensor dig. and both gastrocnemii) was greater in children when comparison is based on lift of same wt., or on the same amt. of action in L. extensor dig. Results are taken to signify a differentiation from mass action which progresses with age, and a less sharp distinction between responses in the younger age group.

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