title: Association of physical activity with sarcopenia and sarcopenic obesity in community-dwelling older adults: the Fourth Korea National Health and Nutrition Examination Survey.
abstract: OBJECTIVE
  this study examined the association of physical activity with sarcopenia and sarcopenic obesity among the community-dwelling Korean elderly.
  
  
  METHODS
  subjects consisted of 2,264 aged 65 years or older in the 2008-09 Korea National Health and Nutrition Examination Survey. Sarcopenia was defined as 2 SD below the mean of the appendicular skeletal muscle/weight for healthy young adults. Obesity was defined as waist circumference ≥ 90 cm for men and ≥ 85 cm for women. Levels of physical activity were classified using the metabolic equivalent task method.
  
  
  RESULTS
  the prevalence of sarcopenia was 12.1% in men and 11.9% in women. Among those with sarcopenia, obesity was prevalent in 68.3% of men and 65.0% of women. Adjusting for all covariates, compared with those with low physical activity, men who engaged in moderate and high activity were 38% and 74%, respectively, less likely to have sarcopenia (Ptrend < 0.001). In women, the relationship between physical activity and sarcopenia was not significant. For sarcopenic obesity, men participating in moderate [odds ratio (OR) = 0.47; 95% confidence interval (CI) 0.26-0.87] and high (OR = 0.27; 95% CI: 0.12-0.60) physical activity, compared with low activity, had significantly lower risk (Ptrend = 0.001). In women, high physical activity was associated with a lower risk of sarcopenic obesity (OR = 0.43; 95% CI: 0.22-0.86).
  
  
  CONCLUSIONS
  physical activity is associated with a reduced risk of sarcopenia and sarcopenic obesity in older Korean adults. There were gender differences in the relationship, with stronger associations observed in men than in women.
authors.affiliation: Department of Preventive Medicine and Public Health, Ajou University School of Medicine, 164 World cup-ro, Youngtong-gu, Suwon 443-721, Republic of Korea.
authors.forename: Mikyung
authors.initials: M
authors.lastname: Ryu
authors.forename: Jaeseong
authors.initials: J
authors.lastname: Jo
authors.forename: Yunhwan
authors.initials: Y
authors.lastname: Lee
authors.forename: Yoon-Sok
authors.initials: YS
authors.lastname: Chung
authors.forename: Kwang-Min
authors.initials: KM
authors.lastname: Kim
authors.forename: Weon-Chil
authors.initials: WC
authors.lastname: Baek
mesh_terms: D000367:Age Factors; D000368:Aged; D000375:Aging; D016009:Chi-Square Distribution; D005260:Female; D015577:Geriatric Assessment; D006801:Humans; D057187:Independent Living; D016015:Logistic Models; D008297:Male; D009043:Motor Activity; D018482:Muscle, Skeletal / Q000473:pathology / Q000503:physiopathology*; D009749:Nutrition Surveys; D009765:Obesity / Q000175:diagnosis / Q000453:epidemiology* / Q000503:physiopathology / Q000517:prevention & control; D016017:Odds Ratio; D009929:Organ Size; D011237:Predictive Value of Tests; D015995:Prevalence; D056910:Republic of Korea / Q000453:epidemiology; D012307:Risk Factors; D055948:Sarcopenia / Q000175:diagnosis / Q000453:epidemiology* / Q000503:physiopathology / Q000517:prevention & control; D012737:Sex Factors; D055105:Waist Circumference
keywords: aged; older people; physical activity; sarcopenia; sarcopenic obesity