Abstract
PURPOSE: The purpose of this study was to assess the reliability of evaluating asymmetrical strength and power deficits in the lower-limbs of functionally-limited elders. METHODS: A cross-sectional evaluation was performed on 57 older (74.2 ± 0.9y, 26 male, SPPB ≤9) adults. Testing was performed twice, at the same time of day, separated by one week. Bilateral knee extensor strength and power was evaluated on Keiser pneumatic resistance training equipment. Asymmetrical strength deficit was defined as the 1 Repetition Maximum (1RM) difference between the right and left legs (Right Leg 1RM - Left Leg 1RM). Asymmetrical power deficit was defined as the difference in Peak Power (PP) between the right and left legs (Right Leg PP - Left Leg PP) at resistances equal to 40% and 70% of the 1RM. The results from the two individual testing days were evaluated for test-retest reliability. In addition, the relationship between asymmetrical strength and power and various measures of functional performance was explored. RESULTS: Asymmetrical strength (Intra Class Correlation (ICC) = 0.799) and power @ 40 (ICC = 0.698) and 70% (ICC = 0.708) of 1RM all showed fair reliability between the two testing days. Correlations showed a moderate association between asymmetrical strength and power and chairstand time: strength (r = 0.497, p < 0.003) and power @ 40 (r = 0.315, p < 0.042) and 70% (r = 0.330, p < 0.021) of 1RM. CONCLUSIONS: These findings support the reliability of evaluating asymmetrical strength and power deficits in the lower limbs of functionally-limited elders as well as the existence of a relationship between strength and power asymmetry and functional performance. Supported by USDA 58-1950-4-401 and NIA RO1-AG-18844
Published Version
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