Reliability of a Selected Measure of Human Strength

Abstract

Five trials spaced a minute apart were secured on 50 male subjects three days in succession on an apparatus designed to isolate action of the right wrist flexor muscle group. Reliability of measurement was assessed through the intraclass correlation technique. Although an acceptable level of reliability was obtained (R = .93), nonpertinent factors apparently intruded. These were tentatively identified as a trial effect due to depletion of energy reserves for strength exertion, and a day effect due to either strength development, a learning effect, or a combination of strength development and learning effects. Consideration of such factors in measurement programs was noted.

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