|Title||Physical activity energy expenditure and sarcopenia in black South African urban women|
|Author(s)||Kruger, Herculina S.; Havemann-Nel, Lize; Ravyse, Chrisna; Moss, Sarah J.; Tieland, Michael|
|Source||Journal of Physical Activity and Health 13 (2016)3. - ISSN 1543-3080 - p. 296 - 302.|
Chair Nutrition and Health over the Lifecourse
|Publication type||Refereed Article in a scientific journal|
|Keyword(s)||Aging - Body composition|
Background: Black women are believed to be genetically less predisposed to age-related sarcopenia. The objective of this study was to investigate lifestyle factors associated with sarcopenia in black South African (SA) urban women. Methods: In a cross-sectional study, 247 women (mean age 57 y) were randomly selected. Anthropometric and sociodemographic variables, dietary intakes, and physical activity were measured. Activity was also measured by combined accelerometery/heart rate monitoring (ActiHeart), and HIV status was tested. Dual energy x-ray absorptiometry was used to measure appendicular skeletal mass (ASM). Sarcopenia was defined according to a recently derived SA cutpoint of ASM index (ASM/height squared) <4.94 kg/m2. Results: In total, 8.9% of the women were sarcopenic, decreasing to 8.1% after exclusion of participants who were HIV positive. In multiple regressions with ASM index, grip strength, and gait speed, respectively, as dependent variables, only activity energy expenditure (β = .27) was significantly associated with ASM index. Age (β = -.50) and activity energy expenditure (β = .17) were significantly associated with gait speed. Age (β = -.11) and lean mass (β = .21) were significantly associated with handgrip strength. Conclusions: Sarcopenia was prevalent among these SA women and was associated with low physical activity energy expenditure.