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activities analysis of variance atherosclerosis athletes ball behavior blood body boys California Census cent level cholesterol College component control group correlation critical ratio determine developed dynamometer effect electrocardiograms error estimates exercise experiment experimental group factors fatigue flexibility flexion football formal warm-up Freshman girls grade Harvard Step Test health education high school inches increase indicated individual informal warm-up interval investigation Journal kicking kinescept kinestruct kinesymbolic leg length level of confidence maximum measure method millisec motor ability movement muscle muscular non-athletes normal obtained participated Pennsylvania State University percent performance period physical education recorded relationship reliability coefficients Research Quarterly response scale school health service showed significantly skill tests somatotype specific standard starting signal statistically stimulus strength subjects Table teachers technique tion toe-touch test trials types University University of Iowa variables varsity venous pressure weight weight training wrestlers