The accuracy of the TriTrac-R3D accelerometer to estimate energy expenditure - PubMed (original) (raw)
The accuracy of the TriTrac-R3D accelerometer to estimate energy expenditure
J M Jakicic et al. Med Sci Sports Exerc. 1999 May.
Abstract
Purpose: This study examined the reliability and validity of the TriTrac-R3D triaxial accelerometer to estimate energy expenditure during various modes of exercise.
Methods: Twenty subjects (age = 21.5+/-3.4 yr; body mass index = 23.3+/-3.6 kg x m(-2)) performed five exercises (treadmill walking, treadmill running, stepping, stationary cycling, and slideboard), with each lasting 20-30 min and workload increased at 10-min intervals. To test the inter-TriTrac reliability, two TriTrac-R3D accelerometers were worn during each exercise period, and to examine validity, a simultaneous measurement of energy expenditure was made using indirect calorimetry (SensorMedics 2900 Metabolic Cart).
Results: Results showed a significant correlation between the two TriTrac-R3D accelerometers during all exercises. The difference in estimated energy expenditure between the two accelerometers during the walking, stepping, and slideboard exercises was less than 1 kcal x min(-1) but statistically significant (P<0.05). There was also a significant correlation between energy expenditure estimated by each of the TriTrac-R3D accelerometers and indirect calorimetry during walking, running, stepping, and slideboard exercise (P<0.05). The interaction of Method x Workload was significant (P<0.05) for each exercise, indicating that the TriTrac-R3D underestimates energy expenditure and that the magnitude of this underestimation increases as workload increases.
Conclusions: Therefore, energy expenditure estimated via triaxial accelerometry does not increase with increasing workloads. These results suggest that there are limitations to using triaxial accelerometry to quantify energy expenditure.
Comment in
- Energy expenditure study makes erroneous inferences and recommendation.
Wood RH, Welsch MA. Wood RH, et al. Med Sci Sports Exerc. 2001 Jun;33(6):1060-1. doi: 10.1097/00005768-200106000-00029. Med Sci Sports Exerc. 2001. PMID: 11404675 No abstract available.
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