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J Phys Act Health. 2016 Mar;13(3):296-302. doi: 10.1123/jpah.2015-0078. Epub 2015 Jul 14.

Physical Activity Energy Expenditure and Sarcopenia in Black South African Urban Women.

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1
Centre of Excellence for Nutrition, North-West University, Potchefstroom, South Africa.

Abstract

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/m(2).

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.

PMID:
26182196
DOI:
10.1123/jpah.2015-0078
[Indexed for MEDLINE]

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