Research Quarterly, Volume 42

05 level AAHPER ability analysis ANOVA Association athletes baseball blood pressure body bradycardia cardiovascular catecholamine changes classes College computed control group correlation coefficient criterion curves decrement delayed static determine dynamic effects ergometer error estimates evaluation exercise experimental group F-ratio factors fatigue patterns Figure flexion fluid intelligence football gross motor skill heart rate improvement increased indicated individual injuries interval investigation knee laboratory ligament linear maximal oxygen intake measures mentally retarded method motor learning motor skill muscle nomogram obtained overlearning overlearning groups participants performance physical activity physical education physical fitness physiological players position posttest practice prediction present study pretest procedure Psychology relationship relative muscular endurance Relative RI reliability Research Quarterly response retention run-walk scores selected significant difference significantly sit-up statistical step test subjects submaximal Table tensiometer tion total peripheral resistance University variables weight wrist York York Clipper