Document Detail

Evaluation of a commercial accelerometer (Tritrac-R3 D) to measure energy expenditure during ambulation.
MedLine Citation:
PMID:  9506799     Owner:  NLM     Status:  MEDLINE    
This study evaluated the ability of a commercially available accelerometer (Tritrac-R3 D) to measure energy expenditure in 16 subjects at rest (pre- and post-exercise) and during three different intensities of steady-state exercise (40-70% of peak oxygen consumption [VO2peak]) while ambulating on a treadmill (no grade). Oxygen consumption and the respiratory exchange ratio from indirect calorimetry and the vector magnitude of triaxial accelerations were used to estimate energy expenditure using the manufacturers' equations. There was a significant relationship between indirect calorimetry-derived energy expenditure and the energy expenditure derived from the accelerometer (r=0.96). Using analysis of variance, there was no difference in the energy expenditure derived by the two methods at rest before exercise and during the three different intensities of ambulatory exercise. There was a significant difference between energy expenditure derived via indirect calorimetry and with the accelerometer during rest after exercise, probably due to the failure of the accelerometer to accurately estimate the energy expenditure associated with the progressive decline in post-exercise oxygen consumption. Thus, this commercially available accelerometer appears to provide statistically acceptable estimates of energy expenditure at rest and during zero-grade treadmill ambulation up to about 70% VO2peak. This may indicate its acceptable utility for large-scale population studies of physical activity involving this mode of movement. The failure of the accelerometer to accurately estimate energy expenditure during recovery from exercise may contribute to an underestimation of energy expenditure in some physically active individuals.
W M Sherman; D M Morris; T E Kirby; R A Petosa; B A Smith; D J Frid; N Leenders
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  International journal of sports medicine     Volume:  19     ISSN:  0172-4622     ISO Abbreviation:  Int J Sports Med     Publication Date:  1998 Jan 
Date Detail:
Created Date:  1998-04-08     Completed Date:  1998-04-08     Revised Date:  2009-11-03    
Medline Journal Info:
Nlm Unique ID:  8008349     Medline TA:  Int J Sports Med     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  43-7     Citation Subset:  IM    
School of Physical Activity and Educational Services, College of Education, The Ohio State University, Columbus 43210, USA.
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MeSH Terms
Analysis of Variance
Calorimetry, Indirect
Energy Metabolism / physiology*
Evaluation Studies as Topic
Exercise Test / instrumentation*
Heart Rate / physiology
Oxygen Consumption / physiology
Pulmonary Gas Exchange / physiology
Regression Analysis
Walking / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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