Abstract
Handgrip and knee extension strengths have each been used to characterize disability. However, it has been reported that the association between handgrip and knee extension strengths is weak. To evaluate the influence of knee extensor and handgrip muscle strength on Timed Up and Go (TUG) test results among elderly women with worse (≥ 10 seconds) and better (< 10 seconds) performance, after controlling for confounders. Cross-sectional study on a sample selected according to convenience, carried out in a federal public institution of higher education. Assessment of handgrip was carried out using the Jamar dynamometer (Lafayette Instrument Company, Inc., Lafayette, United States). Knee extensor muscle performance was measured using an isokinetic dynamometer (Biodex System 3 Pro; Biodex Medical Systems, Inc., United States), The confounding factors were education, age, comorbidities, body mass index and Geriatric Depression Scale and Human Activity Profile scores. Functional performance was assessed through the TUG test. A backward linear regression model was used. 127 elderly women performed the TUG test in more than 10 seconds and 93 in less than 10 seconds. However, regardless of test performance, handgrip strength and knee extension strength comprised the reduced final model. Knee extension strength and handgrip strength might be particularly useful indicators for measuring disability.
Highlights
Knee extension and handgrip strengths have each been used to predict functional performance.[1]
Felicio et al investigated the correlation between handgrip strength and the isokinetic muscle performance of knee extensors and flexors among elderly women living in the community (n = 221)
In a study on 764 elderly individuals, Chan et al found a weak association between knee extension strength and handgrip muscle strength when the results were adjusted for sex and age (R2 = 0.17).[5]
Summary
Knee extension and handgrip strengths have each been used to predict functional performance.[1] Caballer et al observed significant correlations (-0.57) between rectus femoral cross-sectional area and Timed Up and Go (TUG) test performance in a sample of 122 adults aged 65 and older.[2] Di Monaco et al evaluated 123 elderly women and found a significant correlation (-0.41) between handgrip strength and time taken to complete the TUG test.[3]. It has been reported that the association between handgrip strength and knee extension strength is weak. Most of the muscle variables analyzed with their isokinetic dynamometer did not show any significant correlation with handgrip strength.[4] In a study on 764 elderly individuals, Chan et al found a weak association between knee extension strength and handgrip muscle strength when the results were adjusted for sex and age (R2 = 0.17).[5]
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