title: Sitting and cardiometabolic risk factors in U.S. adolescents.
abstract: OBJECTIVE
  To examine sitting time and cardiometabolic disease risk in US adolescents.
  
  
  METHODS
  Data from the 2007-2008 National Health and Nutrition Examination Survey (NHANES) were utilized. Self-reported daily sitting was ascertained by total time in seated activities. Cardiometabolic disease risk was defined by using age- and sex-specific metabolic syndrome (MetS), continuous metabolic risk score, and individual risk factors.
  
  
  RESULTS
  There were 394 adolescents (12-20 yrs) meeting the inclusion criteria. Mean age (± SE) was 16.1 ± 0.1 yrs and 51% were male. Mean daily sitting time (± SE) was 407 ± 11 min/day(6.8 hrs/day) and prevalence of MetS was 8.3%. Adolescents in the highest tertile for sitting time were more likely to be overweight/obese (42%) than adolescents in the other tertiles (22-28%). Multivariate regression analyses revealed that daily sitting time was not associated with MetS (odds ratio 0.94, 95%CI 0.80-1.11) or the continuous risk score (b=0.02, SE=0.03, p=0.44). However, daily sitting time was positively correlated with insulin resistance (HOMA-IR) (b=0.03, SE=0.04, p=0.04); this association was attenuated after accounting for adiposity (sum of skinfolds), diet, and physical activity (b=0.04, SE=0.03, p=0.21).
  
  
  CONCLUSIONS
  In adolescents, daily sitting time was not associated with MetS but was positively associated with fasting insulin resistance, although this relationship appears to be secondary to the influence of adiposity.
authors: Behavioral Nutrition and Physical Activity Laboratory, Department of Nutritional Sciences, University of Oklahoma Health Sciences Center, 1200 N. Stonewall Ave., AHB 3068, Oklahoma City, OK 73117-1215, USA. Tel 405-271-8001 ext 41176. susan-sisson@ouhsc.edu.
authors: Susan B
authors: SB
authors: Sisson
authors: Christina M
authors: CM
authors: Shay
authors: Sarah M
authors: SM
authors: Camhi
authors: Kevin R
authors: KR
authors: Short
authors: Teresa
authors: T
authors: Whited
mesh_terms: D000293:Adolescent; D000328:Adult; D001837:Body Weights and Measures; D002318:Cardiovascular Diseases / Q000453:epidemiology*; D002648:Child; D015444:Exercise; D005260:Female; D006801:Humans; D007333:Insulin Resistance / Q000502:physiology; D008297:Male; D008659:Metabolic Diseases / Q000453:epidemiology*; D024821:Metabolic Syndrome / Q000453:epidemiology; D009749:Nutrition Surveys; D015995:Prevalence; D012307:Risk Factors; D057185:Sedentary Behavior; D057566:Self Report; D013997:Time Factors; D055815:Young Adult