Energy expenditure estimates of the Caltrac accelerometer for running, race walking, and stepping
- 1 September 1997
- journal article
- research article
- Published by BMJ in British Journal of Sports Medicine
- Vol. 31 (3), 235-239
- https://doi.org/10.1136/bjsm.31.3.235
Abstract
Objective To examine the accuracy of the Caltrac accelerometer for estimating energy expenditure (EE) during three exercise modes. Methods A subset of 31 women (mean (SEM) age 22.6 (5) years) was selected from a training study comparing various physiological parameters during race walking, running, and stepping. Subjects each performed mode specific graded exercise tests to peak V̇o2. Regression equations for V̇o2 v heart rate (HR) were generated from each individual's test data. EE (kcal and kJ) was estimated for each V̇o2 value based on the respiratory exchange ratio, and kcal v HR regression equations were generated to predict EE from each subject's HR data (EE-HR). HR in the field was monitored by telemetry, and two Caltrac monitors, one set for EE and one to give counts, were attached to a belt over opposite hips. Results EE-HR was not significantly different across exercise modes. Caltrac overestimated EE (PConclusions The Caltrac is a reliable instrument but it did not accurately distinguish EE in running, race walking, or stepping in a group of young women.Keywords
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