A Comparison of the Maximal Torque Production of the Quadriceps Muscle during Morning and Afternoon Strength Assessment

The purpose of this study was to compare maximal quadriceps torque production in early morning hours to afternoon hours. Thirty male subjects volunteered to participate in this study and were randomly assigned to an AM or PM testing session. At least one week after the first test, the subjects completed a similar test in the opposite time slot. Each subject was positioned on the Kin-Com (Chattecx Corp., Chattanooga, \u27IN) dynamometer and performed six maximal concentric isokinetic repetitions of knee extension at 600/s between the ROM of 10° and 80° of knee flexion. The AM/PM ratios indicated no significant difference between the two trial times. Also, t-test for paired samples calculations were not significantly different for the sample. Pearson\u27s Correlation calculations ranged form .82 to .97. The data support the null hypothesis that there is no significant difference in maximal quadriceps peak torque production in morning versus afternoon hours

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