title: Validity of combining heart rate and uniaxial acceleration to measure free-living physical activity energy expenditure in young men.
abstract: Combining accelerometry (ACC) with heart rate (HR) monitoring is thought to improve activity energy expenditure (AEE) estimations compared with ACC alone to evaluate the validity of ACC and HR used alone or combined. The purpose of this study was to estimate AEE in free-living conditions compared with doubly labeled water (DLW). Ten-day free-living AEE was measured by a DLW protocol in 35 18- to 55-yr-old men (11 lean active; 12 lean sedentary; 12 overweight sedentary) wearing an Actiheart (combining ACC and HR) and a RT3 accelerometer. AEE was estimated using group or individual calibration of the HR/AEE relationship, based on an exercise-tolerance test. In a subset (n = 21), AEE changes (ΔAEE) were measured after 1 mo of detraining (active subjects) or an 8-wk training (sedentary subjects). Actiheart-combined ACC/HR estimates were more accurate than estimates from HR or ACC alone. Accuracy of the Actiheart group-calibrated ACC/HR estimates was modest [intraclass correlation coefficient (ICC) = 0.62], with no bias but high root mean square error (RMSE) and limits of agreement (LOA). The mean bias of the estimates was reduced by one-third, like RMSE and LOA, by individual calibration (ICC = 0.81). Contrasting with group-calibrated estimates, the Actiheart individual-calibrated ACC/HR estimates explained 40% of the variance of the DLW-ΔAEE (ICC = 0.63). This study supports a good level of agreement between the Actiheart ACC/HR estimates and DLW-measured AEE in lean and overweight men with varying fitness levels. Individual calibration of the HR/AEE relationship is necessary for AEE estimations at an individual level rather than at group scale and for ΔAEE evaluation.
authors.affiliation: Carmen Inserm U1060/University of Lyon 1/INRA U1235/CRNH Rhône-Alpes, Lyon, France.
authors.forename: C
authors.initials: C
authors.lastname: Villars
authors.forename: A
authors.initials: A
authors.lastname: Bergouignan
authors.forename: J
authors.initials: J
authors.lastname: Dugas
authors.forename: E
authors.initials: E
authors.lastname: Antoun
authors.forename: D A
authors.initials: DA
authors.lastname: Schoeller
authors.forename: H
authors.initials: H
authors.lastname: Roth
authors.forename: A C
authors.initials: AC
authors.lastname: Maingon
authors.forename: E
authors.initials: E
authors.lastname: Lefai
authors.forename: S
authors.initials: S
authors.lastname: Blanc
authors.forename: C
authors.initials: C
authors.lastname: Simon
mesh_terms: D000054:Acceleration; D056044:Actigraphy / Q000295:instrumentation / Q000592:standards; D000203:Activities of Daily Living; D000293:Adolescent; D000328:Adult; D002138:Calibration; D017666:Deuterium Oxide; D004734:Energy Metabolism; D005080:Exercise Test; D006339:Heart Rate; D006801:Humans; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D009043:Motor Activity; D050177:Overweight / Q000378:metabolism / Q000503:physiopathology*; D011237:Predictive Value of Tests; D015203:Reproducibility of Results; D057185:Sedentary Behavior; D013851:Thinness / Q000378:metabolism / Q000503:physiopathology*; D013997:Time Factors; D055815:Young Adult
chemical_list: D017666:Deuterium Oxide