The influence of practice on the dynamogenic effect of muscular tension.

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Abstract
Tension was induced by having 240 subjects squeeze a dynamometer with the left hand while practising for 50 trials on a Koerth pursuit rotor. Data from this expt. and from a preceding one on memorization under similar muscular tension show that (1) as learning progresses the facilitative influence of optimal degrees of tension increases to a maximum after which it decreases with additional practice, (2) the originally detrimental effect of high degrees of tension becomes more marked as learning progresses, (3) with successive trials the impairment of performance as a result of tensions greater than the optimum occurs earlier in the tension series. An explanation of the results is offered on the basis of 2 assumed factors which operate to modify performance in experiments dealing with the influence of experimentally induced muscular tension.

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