To determine the effects of arm-segment length and varying ball weights on the accuracy of an overarm ball throw, 55 male subjects aged 9 to 11 yr. were divided into short, medium, or long arm-length groups and threw a light (2 1/2 oz.), medium (5 oz.), and heavy (7 1/2 oz.) ball at a circular stationary target. Analysis showed that differences in the ball weights did not significantly vary accuracy scores obtained by boys with arms of short or medium length, while boys with long arms obtained significantly better accuracy when they threw heavy or medium-weight balls than when they threw a light-weight implement.
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