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KMID : 1012420160250010024
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Korean Journal of Obesity
2016 Volume.25 No. 1 p.24 ~ p.30
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Association of Physical Activity and Body Fatness with Vitamin D Deficiency in Older Adults
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Lee In-Hwan
Kang Hyun-Sik
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Abstract
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Background: This study investigated the association between physical activity and body fatness with serum vitamin D level in older adults.
Methods: A total of 233 older adults (39 men and 194 women) aged older than 65 years were voluntarily recruited from a local community. Physical activity was monitored using a uniaxial accelerometer. Body fatness was measured using a standardized protocol. Subjects were classified as sufficient (>30 ng/mL), insufficient (20-29 ng/mL), or deficient (<20 ng/mL) based on serum vitamin D level. Pearson correlation analyses were used to calculate bivariate correlations between variables. Logistic regression was used to determine the odds ratio of serum vitamin D inadequacy.
Results: There were linear increases in physical activity parameters including daily steps (P<0.001), low-intensity physical activity (P<0.001), moderate-intensity physical activity (P<0.001), and high-intensity physical activity (P<0.001) and linear decreases in body fatness parameters such as body mass index (P=0.039) and waist circumference (P=0.020) across incremental vitamin D levels. Vitamin D level was positively associated with daily steps (P<0.001), low-intensity physical activity (P<0.001), moderate-intensity physical activity (P<0.001), and highintensity physical activity (P<0.001) and negatively associated with body mass index (P=0.001), percentage body fat (P=0.005), and waist circumference (P=0.003). Compared to the active group (reference), the inactive group (P=0.001) had a significantly higher odd ratio for serum vitamin D deficiency even after adjusting for age and sex (P=0.002).
Conclusion: The findings of this study suggest that physical activity and vitamin D supplementation should be promoted for healthy aging.
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KEYWORD
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Vitamin D deficiency, Physical activity, Body fatness, Older adults
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