title: Prevalence of sarcopenia and sarcopenic obesity in the Korean population based on the Fourth Korean National Health and Nutritional Examination Surveys.
abstract: BACKGROUND
  Sarcopenia is an important factor of functional impairment related to aging. This study is conducted to investigate the prevalence of sarcopenia and sarcopenic obesity in Korean population.
  
  
  METHODS
  Representative Korean men (4,486) and women (5,999) aged 20 years or older were analyzed from the Fourth Korean National Health and Nutritional Examination Surveys. Sarcopenia was classified into Class I defined relative skeletal muscle mass loss within 1-2 SD of the gender-specific mean for healthy young adults and Class II below 2 SD. Relative skeletal muscle mass was represented by the appendicular skeletal muscle mass adjusted by height and body weight. Sarcopenic obesity was considered present in Class II sarcopenic participants whose waist circumference was more than or equal to 90 cm for men and more than or equal to 85 cm for women, respectively.
  
  
  RESULTS
  The prevalence of Class II sarcopenia in the Korean elderly population was 12.4% for men and 0.1% for women by height-adjusted definition and 9.7% for men and 11.8% for women by weight-adjusted definition. The prevalence of sarcopenic obesity was 7.6% for men and 9.1% for women by weight-adjusted definition but nearly zero for men and women by height-adjusted definition. The prevalence of sarcopenia increased with age for men but for women only when applied with weight-adjusted definition.
  
  
  CONCLUSIONS
  The prevalence of sarcopenia and sarcopenic obesity differs by gender and definition criteria. The height-adjusted definition may tend to underestimate the prevalence of sarcopenia and sarcopenic obesity, especially in women.
authors.affiliation: Department of Family Medicine, Ajou University School of Medicine, Suwon, Korea.
authors.forename: Young-Sang
authors.initials: YS
authors.lastname: Kim
authors.forename: Yunhwan
authors.initials: Y
authors.lastname: Lee
authors.forename: Yoon-Sok
authors.initials: YS
authors.lastname: Chung
authors.forename: Duck-Joo
authors.initials: DJ
authors.lastname: Lee
authors.forename: Nam-Seok
authors.initials: NS
authors.lastname: Joo
authors.forename: Doohee
authors.initials: D
authors.lastname: Hong
authors.forename: Go eun
authors.initials: Ge
authors.lastname: Song
authors.forename: Hyeon-Jeong
authors.initials: HJ
authors.lastname: Kim
authors.forename: Yong Jun
authors.initials: YJ
authors.lastname: Choi
authors.forename: Kwang-Min
authors.initials: KM
authors.lastname: Kim
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000473:pathology*; D005260:Female; D006306:Health Surveys / Q000706:statistics & numerical data; D006801:Humans; D008297:Male; D008875:Middle Aged; D009749:Nutrition Surveys / Q000706:statistics & numerical data; D009765:Obesity / Q000150:complications / Q000453:epidemiology*; D015995:Prevalence; D056910:Republic of Korea / Q000453:epidemiology; D055948:Sarcopenia / Q000145:classification / Q000150:complications / Q000453:epidemiology*; D055815:Young Adult