Grip-Strength Measurement: A Comparison of Three Jamar Dynamometers

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Abstract
These two studies evaluated whether three types of Jamar dynamometers measured equivalently. In study A, 26 subjects were tested on 2 types; in study B, 30 subjects were tested on 3 types. Both studies found significant differences between and among the dynamometers. Therapists can no longer assume that all versions of the Jamar dynamometer measure equivalently, and the differences should be taken into account when using normative data and when assessing treatment effectiveness. In the latter case, the same dynamometer must be used for pre- and posttesting.

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