To investigate the influence of physical activity on the efficiency of mental work 50 Ss between 19 and 21 yr. of age did step-ups (for physical activity) and added, subtracted, multiplied, and divided simple sums of one digit (for mental work). Analysis disclosed a significant ( p < .01) increase in mental work when the physical activity was of 2 and 5 min. duration and significant ( p < .01) decrease when the physical activity was of 10 and 15 min. duration.
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Gupta et al. (1974) studied this question.
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