Total Energy Expenditure Estimated Using Foot-Ground Contact Pedometry

摘要

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 (TEEPEDO) 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. TEEPEDO 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 (MLoco), where MLoco was derived from total weight (body weight + load weight) and accelerometric measurements of Tc. TEEPEDO data were compared with TEEs measured by the DLW (2H218O) method (TEEDLW): TEEDLW = 15.27 +/- 1.65 MJ/day and TEEPEDO = 1529 +/- 0.83 MJ/day. Mean bias (i.e., TEEPEDO - TEEDLW) was 0.02 MJ, and mean error (SD of individual differences between TEEPEDO and TEEDLW) 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.