Total energy expenditure estimated using foot-ground contact pedometry.
Routine walking and running, by increasing daily total energy expenditure (TEE), can play a significant role in reducing the likelihood of obesity. The objective of this field study was to compare TEE estimated using foot-ground contact time (Tc)-pedometry (TEE(PEDO)) with that measured by the criterion doubly labeled water (DLW) method. Eight male U.S. Marine test volunteers [27 +/- 4 years of age (mean +/- SD); weight = 83.2 +/- 10.7 kg; height = 182.2 +/- 4.5 cm; body fat = 17.0 +/- 2.9%] engaged in a field training exercise were studied over 2 days. TEE(PEDO) was defined as (calculated resting energy expenditure + estimated thermic effect of food + metabolic cost of physical activity), where physical activity was estimated by Tc-pedometry. Tc-pedometry was used to differentiate inactivity, activity other than exercise (i.e., non-exercise activity thermogenesis, or NEAT), and the metabolic cost of locomotion (M(LOCO)), where M(LOCO) was derived from total weight (body weight + load weight) and accelerometric measurements of Tc. TEE(PEDO) data were compared with TEEs measured by the DLW (2H2(18)O) method (TEE(DLW)): TEE(DLW) = 15.27 +/- 1.65 MJ/day and TEE(PEDO) = 15.29 +/- 0.83 MJ/day. Mean bias (i.e., TEE(PEDO) - TEE(DLW)) was 0.02 MJ, and mean error (SD of individual differences between TEE(PEDO) and TEE(DLW)) was 1.83 MJ. The Tc-pedometry method provided a valid estimate of the average TEE of a small group of physically active subjects where walking was the dominant activity.
MCMR-BMD, U.S. Army Research Institute of Environmental Medicine, Natick, Massachusetts 01760-5007, USA. reed.hoyt@na.amedd.army.mil
Reed W
RW
Hoyt
Mark J
MJ
Buller
William R
WR
Santee
Miyo
M
Yokota
Peter G
PG
Weyand
James P
JP
Delany
D000328:Adult; D001835:Body Weight / Q000502:physiology; D004734:Energy Metabolism / Q000502:physiology*; D006801:Humans; D008297:Male; D008889:Military Personnel; D008991:Monitoring, Physiologic / Q000379:methods; D016138:Walking / Q000502:physiology*