title: Validation of an armband to measure daily energy expenditure in older adults.
abstract: BACKGROUND
  Objective methods to measure daily energy expenditure in studies of aging are needed. We sought to determine the accuracy of total energy expenditure (TEE) and activity energy expenditure (AEE) estimates from the SenseWear Pro armband (SWA) using software versions 6.1 (SWA 6.1) and 5.1 (SWA 5.1) relative to criterion methods in free-living older adults.
  
  
  METHODS
  Participants (n = 19, mean age 82.0 years) wore a SWA for a mean ± SD 12.5 ± 1.1 days, including while sleeping. During this same period, criterion values for TEE were assessed with doubly labeled water and for resting metabolic rate (RMR) with indirect calorimetry. AEE was calculated as 0.9 TEE - RMR.
  
  
  RESULTS
  For TEE, there was no difference in mean ± SD values from doubly labeled water (2,040 ± 472 kcal/day) versus SWA 6.1 (2,012 ± 497 kcal/day, p = .593) or SWA 5.1 (2,066 ± 474 kcal/day, p = .606); individual values were highly correlated between methods (SWA 6.1 r = .893, p < .001; SWA 5.1 r = .901, p < .001) and demonstrated strong agreement (SWA 6.1 intraclass correlation coefficient = .896; SWA 5.1 intraclass correlation coefficient = .904). For AEE, mean values from SWA 6.1 (427 ± 304 kcal/day) were lower by 26.8% than criterion values (583 ± 242 kcal/day, p = .003), and mean values from SWA 5.1 (475 ± 299 kcal/day) were lower by 18.5% than criterion values (p = .021); however, individual values were highly correlated between methods (SWA 6.1 r = .760, p < .001; SWA 5.1 r = .786, p < .001) and demonstrated moderate agreement (SWA 6.1 intraclass correlation coefficient = .645; SWA 5.1 intraclass correlation coefficient = .720). Bland-Altman plots identified no systematic bias for TEE or AEE.
  
  
  CONCLUSIONS
  Acceptable levels of agreement were observed between SWA and criterion measurements of TEE and AEE in older adults.
authors: California Pacific Medical Center, 185 Berry Street, Suite 5700, San Francisco, CA 94107, USA. dmackey@sfcc-cpmc.net
authors: Dawn C
authors: DC
authors: Mackey
authors: Todd M
authors: TM
authors: Manini
authors: Dale A
authors: DA
authors: Schoeller
authors: Annemarie
authors: A
authors: Koster
authors: Nancy W
authors: NW
authors: Glynn
authors: Bret H
authors: BH
authors: Goodpaster
authors: Suzanne
authors: S
authors: Satterfield
authors: Anne B
authors: AB
authors: Newman
authors: Tamara B
authors: TB
authors: Harris
authors: Steven R
authors: SR
authors: Cummings
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001132:Arm; D001481:Basal Metabolism; D002153:Calorimetry, Indirect; D004734:Energy Metabolism; D005260:Female; D006801:Humans; D008297:Male; D018670:Monitoring, Ambulatory / Q000295:instrumentation*; D012984:Software