The accuracy of the TriTrac-R3D accelerometer to estimate energy expenditure
Deutscher übersetzter Titel: | Die Messgenauigkeit des TriTrac-R3D-Akzelerometers in der Bestimmung des Energieverbrauchs |
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Autor: | Jakicic, J.M.; Winters, C.; Lagally, K.; Ho, J.; Robertson, R.J.; Wing, R.R. |
Erschienen in: | Medicine and science in sports and exercise |
Veröffentlicht: | 31 (1999), 5, S. 747-754, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource |
Sprache: | Englisch |
ISSN: | 0195-9131, 1530-0315 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU199906400131 |
Quelle: | BISp |
Abstract des Autors
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/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/min 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. Verf.-Referat