Effect of wrist positioning on isokinetic performance and repeatability of measurement for wrist flexors and extensors

Author： Fong Pauline W. K. Ng Gabriel Y. F.

ISSN： 1532-5040

Source： Physiotherapy Theory and Practice, Vol.16, Iss.3, 2000-09, pp. : 169-176

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Abstract

This study tested the repeatability and effects of two wrist positions on isokinetic peak torque and average work of wrist flexion and extension movements. Fifteen healthy adult males were tested twice, one week apart, with a Dexter TradeStation at two testing speeds of 60°/s and 180°/s. The wrist positions were: 1) neutral radial/ulnar deviation (RUD), and 2) 15° ulnar deviation (UD). Results showed good repeatability for isokinetic measurements of both the flexors and extensors (ICC 0:7042 -0.9367). Due to a significant interaction between wrist position and testing speed in the 2-way ANOVA analysis, paired t -tests were used to analyze the factors separately. The results showed that both isokinetic peak torque and the average work of wrist flexion and extension at 15° UD were greater than that measured with neutral RUD (p < 0:0005) . This finding has clinical implications for testing and rehabilitation of wrist and hand functions. The good reliability of the results suggests that isokinetic testing can be used to assess the progress of change in muscle performance of patients. In planning for hand rehabilitation exercises, therapists can adopt the position that is most facilitative for the muscle action.