Comparison of heart rate monitoring with indirect calorimetry for energy expenditure evaluation

The aim of this study was to examine the energy expenditure (EE) measured using indirect calorimetry (IC) during playground games and to assess the validity of heart rate (HR) and accelerometry counts as indirect indicators of EE in children´s physical activity games. 32 primary school children (9.9 ± 0.6 years old, 19.8 ± 4.9 kg · m-2 BMI and 37.6 ± 7.2 ml · kg-1 · min-1 VO2max). Indirect calorimetry (IC), accelerometry and HR data were simultaneously collected for each child during a 90 min session of 30 playground games. Thirty-eight sessions were recorded in 32 different children. Each game was recorded at least in three occasions in other three children. The intersubject coefficient of variation within a game was 27% for IC, 37% for accelerometry and 13% for HR. The overall mean EE in the games was 4.2 ± 1.4 kcals · min-1 per game, totaling to 375 ± 122 kcals/per 90 min/session. The correlation coefficient between indirect calorimetry and accelerometer counts was 0.48 (p = .026) for endurance games and 0.21 (p = .574) for strength games. The correlation coefficient between indirect calorimetry and HR was 0.71 (p = .032) for endurance games and 0.48 (p = .026) for strength games. Our data indicate that both accelerometer and HR monitors are useful devices for estimating EE during endurance games, but only HR monitors estimates are accurate for endurance games.

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MINUTE-BY-MINUTE HEART RATE MONITORING TO ESTIMATE ENERGY EXPENDITURE DURING CYCLING AND RUNNING

Medicine & Science in Sports & Exercise ◽

10.1097/00005768-200105001-01411 ◽

2001 ◽

Vol 33 (5) ◽

pp. S251

Author(s):

J A. Carlstrom ◽

S E. Gaskill ◽

B C. Ruby

Keyword(s):

Heart Rate ◽

Energy Expenditure ◽

Heart Rate Monitoring

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Determining energy expenditure in preterm infants: comparison of 2H(2)18O method and indirect calorimetry

AJP Regulatory Integrative and Comparative Physiology ◽

10.1152/ajpregu.1992.263.3.r685 ◽

1992 ◽

Vol 263 (3) ◽

pp. R685-R692 ◽

Cited By ~ 1

Author(s):

C. L. Jensen ◽

N. F. Butte ◽

W. W. Wong ◽

J. K. Moon

Keyword(s):

Heart Rate ◽

Energy Expenditure ◽

Preterm Infants ◽

Indirect Calorimetry ◽

Water Flux ◽

High Ratio ◽

Individual Variability ◽

Study Time ◽

Co2 Production ◽

Turnover Rates

The doubly labeled water (2H(2)18O) method used to estimate total energy expenditure (EETotal) is particularly sensitive to analytic error in preterm infants, because of their high percentage of body water and the high ratio of water flux to CO2 production. To evaluate further use of this method, the EE of 12 preterm infants was measured by indirect calorimetry and 2H(2)18O simultaneously and continuously for 5 days. Initial infant weight, age, and postconceptional age were (means +/- SD) 1,674 +/- 173 g, 4.4 +/- 2.6 wk, and 34.6 +/- 1.6 wk, respectively. The indirect calorimeter system included an air-temperature-controlled chamber and heart rate monitor. EE was measured by indirect calorimetry for 85.6 +/- 4.7% of study time and estimated from the linear regression of heart rate on EE for 14.4 +/- 4.7% of study time. The 2H(2)18O method entailed an initial dose of 100 mg 2H2O and 250 mg 18O/kg and a final dose of 75 mg 18O/kg; urine was collected twice daily. 2H and 18O enrichments were measured by gas-isotope-ratio mass spectrometry. EE was calculated from measured 2H and 18O dilution spaces (NH, NO), turnover rates (kH, kO), and measured respiratory quotient. The ratio of 2H to 18O dilution spaces was 1.01 +/- 0.01 and the ratio of kO to kH was 1.16 +/- 0.04. Estimation of EE from 2H(2)18O and indirect calorimetry agreed within 1%, although individual variability in methods was large.

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