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Abstract

The objective of the study was to verify the stability of two consecutive force measurements, using a multidirectional dynamometer for the thumb, in order to determine whether there is a visuomotor learning or fatigue effect. The maximal static forces (MSF) exerted at the proximal phalanx of the thumb were obtained in 23 normal female participants aged 21 to 28 years. Two measurements of the MSFs in eight directions covering 360°, at increments of 45°, were examined for both the dominant and nondominant hand using visual feedback. A three-way analysis of variance with repeated measures (factors: direction-trial-handedness) showed a single significant interaction observed between the factors of direction and trial. Because no significant main effect for factor handedness was observed, the data regarding this factor were pooled. Further analysis using t-tests indicated that the MSFs were not significantly different between trials and that the MSFs exerted in directions with abduction were lower than those exerted in adduction. It is concluded that stable measurements of the thumb's strength are obtained within two consecutive trials and that neither visuomotor learning nor fatigue affect the measurements.

Keywords

hand evaluation dynamometry strength musculoskeletal system

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Stability of Maximal Static Forces of the Thumb Exerted in Different Directions

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