title: Different location of triaxial accelerometer and different energy expenditures.
abstract: OBJECTIVE
  We performed a study to determine the best appropriate wearing site of a triaxial accelerometer at different exercise speeds.
  
  
  METHODS
  We conducted an observational study with 66 healthy Korean adults (26 men and 40 women). Resting metabolic rate (RMR) before exercise, physical activity-related energy expenditure (PAEE) by cardiorespiratory gas analyzer and Signal Vector Magnitude (SVM) were measured while wearing four triaxial accelerometers on four different sites (wrist, waist, upper arm, and ankle) at exercise speeds from 2-10 km/h.
  
  
  RESULTS
  The mean RMR was 4.03 mL/kg/min and Actual METs (oxygen consumption at different exercise speeds divided by individual RMR) compared with the calculated METs (oxygen consumption divided by 3.5 mL/kg/min) showed relatively low value. The overall correlation between PAEE and SVM was highest when the accelerometer was worn on the wrist at low exercise speed (r=0.751, p<0.001), waist at a moderate speed (r=0.821, p<0.001), and ankle at a high speed (r=0.559, p<0.001). Using regression analysis, it was shown that the ankle at a low speed (R²=0.564, p<0.001), high speed (R²=0.559, p<0.001), and the waist at a moderate speed (R²=0.821, p<0.001) were the best appropriate sites.
  
  
  CONCLUSIONS
  When measuring the PAEE and SVM at different exercise speeds, the ankle in low and high exercise speed, and waist in moderate speed are the most appropriate sites for an accelerometer.
authors: Fit. Life Inc., Suwon, Korea.
authors: Do Yoon
authors: DY
authors: Kim
authors: Fit. Life Inc., Suwon, Korea.
authors: Yoo-Suk
authors: YS
authors: Jung
authors: Department of Medical Informatics, Ajou University School of Medicine, Suwon, Korea.
authors: Rae-Woong
authors: RW
authors: Park
authors: Department of Family Practice and Community Health, Ajou University School of Medicine, Suwon, Korea. jchcmc@hanmail.net.
authors: Nam-Seok
authors: NS
authors: Joo
mesh_terms: D000328:Adult; D000886:Anthropometry / Q000379:methods*; D001481:Basal Metabolism / Q000502:physiology; D004734:Energy Metabolism / Q000502:physiology*; D015444:Exercise / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010101:Oxygen Consumption / Q000502:physiology; D055815:Young Adult
keywords: Physical activity; Signal Vector Magnitude; energy expenditure; triaxial accelerometer