title: Do the speeds defined by the American College of Sports Medicine metabolic equation for running produce target energy expenditures during isocaloric exercise bouts?
abstract: The accuracy of the American College of Sports Medicine (ACSM) equations for producing predicted values of heart rate reserve (HRR) and oxygen uptake reserve (VO2R) and consequently, target energy expenditure (EE) during exercise are yet to be established. This study investigated whether speeds defined by the ACSM metabolic equation for running correctly estimate the EEs during isocaloric exercise bouts. Twenty-eight men performed a ramp-incremental maximal exercise test to determine HRmax and VO2max. Two continuous exercise bouts at 60 and 80% VO2R and target EE of 400 kcal were then performed. In the 60% VO2R exercise the observed VO2R and EE were lower than predicted only during the first time quartile of the bout (t = 6.5, p < 0.001), whereas at 80% VO2R it was lower during the first (t = 15.3, p < 0.001), second (t = 5.4, p < 0.001) and third (t = 3.1, p = 0.025) quartiles. The observed HR was lower than predicted in the first time quartile of the 60% [Formula: see text] (t = 5.6, p < 0.001) and 80% VO2R bouts (t = 10.7, p < 0.001), whereas no significant differences occurred for any other time quartiles (p ≥ 0.23). In conclusion, the running speed defined by the ACSM metabolic equation overestimated VO2R and EE within exercise performed at 60 and 80% VO2R especially in higher intensities.
authors.affiliation: Medical Sciences Graduate Program, Faculty of Medical Sciences, State University of Rio de Janeiro, Rio de Janeiro, Brazil.
authors.forename: Felipe A
authors.initials: FA
authors.lastname: Cunha
authors.forename: Robert P G
authors.initials: RP
authors.lastname: Catalão
authors.forename: Adrian W
authors.initials: AW
authors.lastname: Midgley
authors.forename: Jonas
authors.initials: J
authors.lastname: Gurgel
authors.forename: Flávia
authors.initials: F
authors.lastname: Porto
authors.forename: Paulo T V
authors.initials: PT
authors.lastname: Farinatti
mesh_terms: D000293:Adolescent; D000328:Adult; D004734:Energy Metabolism; D005080:Exercise Test / Q000592:standards*; D017408:Guidelines as Topic; D006339:Heart Rate; D006801:Humans; D008297:Male; D008954:Models, Biological; D009119:Muscle Contraction; D018482:Muscle, Skeletal / Q000378:metabolism*; D010101:Oxygen Consumption; D015203:Reproducibility of Results; D015656:Respiratory Mechanics; D012420:Running; D012955:Societies, Medical / Q000592:standards; D013178:Sports Medicine / Q000592:standards; D013997:Time Factors; D014481:United States; D055815:Young Adult