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Title: Does elbow position affect strength and reproducibility of power grip measurements?
Authors: Ng, GY 
Fan, AC
Keywords: Hand
Muscle testing
Issue Date: 2001
Publisher: Elsevier
Source: Physiotherapy, 2001, v. 87, no. 2, p. 68-72 How to cite?
Journal: Physiotherapy 
Abstract: Effects of elbow positioning on grip strength and its between-day reliability of measurement were tested bilaterally in 30 healthy adults. Grip strength was measured twice with a Jamar dynamometer at 0°, 30°, 60°, 90° and 120° of elbow flexion one week apart. Intraclass correlation coefficient model(1,1) was > 0.987 for each test, and limits of agreement reveal narrow ranges of the 95% confidence intervals for each test, which reflect good between-day reliability for these measurements in both absolute and relative terms. Grip strength at 120° was significantly lower than all other positions on both sides (p < 0.001), whereas the grip strength at 90° was highest among all positions tested. The grip strengths at 0°, 30° and 60° were, in general, 0.5-3% lower than the measurements taken at 90° of elbow flexion, but the differences were not statistically significant. These findings suggest that between-day comparison of grip strength is valid and reproducible in the same testing position, and 120° of elbow flexion is not a desirable position for grip strengthening exercise. The differences in grip strength can be explained by the length-tension relationship and the clinical implications for these findings are discussed.
ISSN: 0031-9406
EISSN: 1873-1465
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