Abstract
Objective
To verify the ability to evaluate physical performance tests in the identification of low muscle mass (MM) in middle-aged and old women.
Method
This cross-sectional study was carried out with 540 middle-aged (40-59 years old) and old women (≥60 years old) in the municipalities of Parnamirim and Santa Cruz in the state of Rio Grande do Norte, Brazil. MM, handgrip strength, knee extension, and gait speed were evaluated. Low MM was defined by skeletal muscle mass index lower than the lower 20% for each age group. The following tests were used: Student’s t, chi-square, ROC curve analysis to calculate the area under the curve, and cutoff point of each test in the discrimination of participants with low MM. P<0.05 and CI of 95% were considered.
Results
For the middle-aged group, the handgrip and knee extension strength showed moderate sensitivity (71.6% and 72.5%, respectively) and specificity (59.4% and 56.0%, respectively) in the identification of low MM. For the old women, gait speed and handgrip strength showed good sensitivity (77.8% and 81.6%, respectively) and moderate specificity (51.4% and 64.5%, respectively). The discriminatory capacity of gait speed for middle-aged women and knee extension strength for old women were unsatisfactory.
Conclusion
Muscle strength measurements are useful for low MM screening in middle-aged women, while handgrip strength and gait speed tests are useful for older women.
Keywords
Mass Screening; Women; Sarcopenia; ROC curve; Muscle strength