Student Journal of Health Sciences, vol 3 2000 no 1

Intra- and Intertester Reliability of a Handheld Myometry for Measurement of Wrist Extension Strength
Authors: Axgren C, Maunsbach A, Physiotherapy Programme, Faculty of Health Sciences, Linköpings Universitet, Sweden.
Tutor: Ertzgaard S, RPT, MSc, Dept. of Neuroscience and Locomotion, Faculty of Health Sciences, Linköpings Universitet, Sweden
Epicondylitis is a common cause for pain in the forearm. One of the symptoms is weakness in the wrist extensors. It is therefore important in clinical settings to be able to estimate strength within this muscle group, in order to compare the patientsí strength versus the normal population and to evaluate the effectiveness of physiotherapy treatment. Finding a reliable measurement for this object is therefore very important.

The purpose of this study was to determine the intra- and intertest reliability of the myometry Chatillon DFM 100, measuring wrist extension strength in persons without known disorders affecting their upper extremity. 30 students at the physiotherapy programme in Linköping ranging in age from 22 to 45 years (mean 28,0 SD 6,4) participated in the study.

The result of this study showed a very good intra- and intertest reliability. ICC (Intra Class Correlation) value concerning intratest reliability was for observer A 0,94 and for observer B 0,93.

ICC value concerning intertest reliability was 0,90 in test and 0,89 in retest. Therefore, the Chatillon DFM 100 seems to be a suitable measurement to use in clinical settings when assessing wrist extensor strength.

Keywords: lateral epicondylitis, muscle strength, myometry, physiotherapy, reliability, wrist extensor

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