Title page for ETD etd-06172003-123416

Type of Document Master's Thesis
Author Fruin, Margaret Louise
Author's Email Address mfruin@vt.edu
URN etd-06172003-123416
Title Reliability and Validity of a Multi-Sensor Armband in Estimating Resting and Exercise Energy Expenditure
Degree Master of Science
Department Human Nutrition, Foods, and Exercise
Advisory Committee
Advisor Name Title
Rankin, Janet L. Walberg Committee Chair
Herbert, William G. Committee Member
Wojcik, Janet R. Committee Member
  • physical activity
  • SenseWear Armband
  • activity monitoring
  • caloric expenditure
  • motion sensors
Date of Defense 2003-06-04
Availability unrestricted
This study examined the reliability and validity of the SenseWear Armband (SWA,

BodyMedia, Inc.) during rest and exercise compared to indirect calorimetry (IC). Energy

expenditure (EE) was assessed with SWA and IC in 13 males during two resting and one

cycle ergometry (40 min at 60% VO2peak) sessions. In a second experiment, 20 adults

walked on a treadmill for 30 min at 3 intensities while IC and SWA measured EE. At

rest, no significant differences were found between EE measurements from the SWA (1.3

+/- 0.1 kcal/min) and IC (1.3 +/- 0.1 kcal/min), and the methods were significantly

correlated (r = 0.76). The SWA EE estimation was reliable when comparing the two

resting visits (r = 0.93). For the ergometer protocol, no significant differences were found

between the SWA and IC measurements of EE early, mid, or late in exercise or for the

total bout, although the measurements were not correlated (r = 0.03-0.12). The SWA EE

estimate of walking increased with treadmill speed but not with inclination. The SWA

significantly overestimated the EE of walking with no grade (27.4% for 3mph; 12.6% for

4mph) and significantly underestimated EE on the 5% grade (21.9%) (p<0.02). The SWA

estimation of EE correlated with IC (r = 0.47-0.69). The SWA provided valid and reliable

estimates of EE at rest. The SWA provided similar mean estimates of EE as IC on the

ergometer, however the individual error was large. The SWA overestimated the EE of

flat walking and underestimated inclined walking EE.

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