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Muscle Strength, But Not Mass, Is Associated With Physical Function In Long-term Gastric By-pass Women

Muscle strength, but not mass, is associated with physical function in long-term gastric by-pass women Muscle-related phenotypes have been linked to physical function in the general population; however, this relationship has yet to be examined in long-term gastric by-pass women. PURPOSE: To examine the association between muscle mass, muscle strength and physical function in women who have been doing gastric by-pass for over 2 years. METHODS: A total of 117 female participants (age: 38.7 ± 7.6 years) underwent muscle mass (dual-energy x-ray absorptiometry), muscle strength( knee extensors isokinetic peak torque at 60 °/s), and physical function (sit-to-stand, timed up-and-go, and six-minute walk tests) evaluation. Spearman's rank correlation coefficient was used to identify associations. Mann-Whitney U test was used to compare the physical function of participants in the lowest and highest quartiles of muscle mass and strength. RESULTS: The table below presents the association between muscle mass, muscle strength and physical function. Of the studied muscle-related phenotypes, only muscle strength was significantly related to physical function. Compared to the highest quartile of muscle strength, participants in the lowest quartile exhibited significantly worse performance in the timed-up and go test (6.3 ± 0.9 s vs. 5.8 ± 0.9 s; p= 0.048), but did not reach statistical significance the sit-to-stand (14.6 ± 2.9 vs. 16.3 ± 4.0; p= 0.124) and six-minute walk (569.6 ± 54.9 m vs. 599.8 ± 82.1 m; p= 0.178) tests. CONCLUSION: Muscle strength, but not muscle mass, is associated with physical function in long-term gastric by-pass women; which support a growing body of evidence demonstrating that strength has a better prognostic value compared to muscle mass to predict worsening disability.