Resumen de Validation of Heart Rate Monitor-Based Predictions of Oxygen Uptake and Energy Expenditure
Paul G. Montgomery, Daniel J. Green, Naroa Etxebarria, David B. Pyne, Philo U. Saunders, Clare L. Minahan
To validate [latin capital V with dot above]o2 and energy expenditure predictions by the Suunto heart rate (HR) system against a first principle gas analysis system, well-trained male (n = 10, age 29.8 ± 4.3 years, [latin capital V with dot above]o2 65.9 ± 9.7 ml·kg-1·min-1) and female (n = 7, 25.6 ± 3.6 years, 57.0 ± 4.2 ml·kg-1·min-1) runners completed a 2-stage incremental running test to establish submaximal and maximal oxygen uptake values. Metabolic cart values were used as the criterion measure of [latin capital V with dot above]o2 and energy expenditure (kJ) and compared with the predicted values from the Suunto software. The 3 levels of software analysis for the Suunto system were basic personal information (BI), BI + measured maximal HR (BIhr), and BIhr + measured [latin capital V with dot above]o2 (BIhr + v). Comparisons were analyzed using linear regression to determine the standard error of the estimate (SEE). Eight subjects repeated the trial within 7 days to determine reliability (typical error [TE]). The SEEs for oxygen consumption via BI, BIhr, and BIhr + v were 2.6, 2.8, and 2.6 ml·kg-1·min-1, respectively, with corresponding percent coefficient of variation (%CV) of 6.0, 6.5, and 6.0. The bias compared with the criterion [latin capital V with dot above]o2 decreased from -6.3 for BI, -2.5 for BIhr, to -0.9% for BIhr + v. The SEE of energy expenditure improved from BI (6.74 kJ) to BIhr (6.56) and BIhr + v (6.14) with corresponding %CV of 13.6, 12.2, and 12.7. The TE values for [latin capital V with dot above]o2 were ~0.60 ml·kg-1·min-1 and ~2 kJ for energy expenditure. The %CV for [latin capital V with dot above]o2 and energy expenditure was ~1 to 4%. Although reliable, basic HR-based estimations of [latin capital V with dot above]o2 and energy expenditure from the Suunto system underestimated [latin capital V with dot above]o2 and energy expenditure by ~6 and 13%, respectively. However, estimation can be improved when maximal HR and [latin capital V with dot above]o2 values are added to the software analysis.
