Int J Sports Med 1998; 19(1): 43-47
DOI: 10.1055/s-2007-971878
Training and Testing

© Georg Thieme Verlag Stuttgart · New York

Evaluation of a Commercial Accelerometer (Tritrac-R3 D) to Measure Energy Expenditure During Ambulation

W. M. Sherman1 , D. M. Morris1 , T. E. Kirby1 , R. A. Petosa1 , B. A. Smith2 , D. J. Frid3 , N. Leenders1
  • 1School of Physical Activity and Educational Services, College of Education, The Ohio State University, Columbus, OH
  • 2Department of Family and Community, College of Nursing, The Ohio State University, Columbus, OH
  • 3Department of Cardiology, College of Medicine, The Ohio State University, Columbus, OH
Further Information

Publication History

Publication Date:
09 March 2007 (online)

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 progresssive decline in post-exercise oxygen consumption. Thus, this commerically 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.

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