Two experiments were conducted concerning diurnal variations in physical performance. Subjects were tested at 9 AM, 12 noon, and 3 PM on various physical parameters. Exp. 1 gave no significant differences among the three performances of grip strength and reaction times for 16 subjects. For seven subjects involved in Exp. 2, endurance ratios and torque accelerations, as recorded on a Cybex II, were used as criterion measures. A significant difference was found between the 9 AM and 3 PM performance of the flexion endurance ratio. No other differences were identified.
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