Reliability and Validity of Seated Hip Extensor Strength Measurement by Handheld Dynamometer in Older Adults

This study examined the reliability and validity of the sitting measurement by a handheld dynamometer in older adults. Methods: Participants were 40 older adults (age [SD] = 82.4 [4.3] years). Measurements of isometric hip extensor muscle strength using a handheld dynamometer in 3 positions (sitting, standing, and prone) were conducted twice. A surface electromyogram was used to measure the activity of the gluteus maximus and the semitendinosus muscles. The reliability of muscle strength in each posture was examined with Cronbach α coefficient, intraclass correlation coefficients (ICCs1,1), and Bland-Altman analysis. The concurrent validity of muscle strength for the sitting and standing positions with reference to the prone position was examined with Spearman rank correlation and Bland-Altman analysis. Furthermore, muscle strength and muscle activity were compared between each posture. Results: The Cronbach α coefficient was 0.75. For each posture, the ICC1,1 was 0.86 to 0.87, with no systematic error in the sitting and prone positions. The sitting and standing positions were significantly associated with the prone position (rs = 0.72 and 0.42), with no systematic error between the sitting and prone positions. Proportional error was demonstrated between the standing and prone positions (P
Source: Journal of Geriatric Physical Therapy - Category: Physiotherapy Tags: Research Reports Source Type: research