Agreement between ACSM’s equation and cardiopulmonary exercise test in determine maximal oxygen uptake in individuals with metabolic syndrome

Abstract

PurposeLow functional capacity is associated with cardiovascular risk factors. Cardiopulmonary exercise test (CPET) is the gold standard evaluation to determine functional capacity through maximal oxygen uptake (VO2max) measurement. However, the high financial cost, the material and the time spent on this method difficult its use in a large number of clinicals. In this sense, it is possible to determine VO2max via the equivalence formulas. The aim of this study was to verify the agreement between indirect calculation of VO2max using American College of Sports Medicine (ACSM) equation and the directly measure of maximal oxygen uptake in metabolic syndrome (MetS) patients.MethodsSixty non‐diabetic and without medication patients with MetS (ATP‐III) were divided in 2 groups, according to gender: Male (n=32; 46±9 y; 31.2±3.0 kg/m2); and Female (n=28; 49±9 y; 32.7±3.1 kg/m2). VO2max was measured during CPET in a cycle ergometer with ramp protocol and estimated by ACSM’s equation [VO2= 7.0+ (1.8 x work rate)/body mass].ResultsAll patients included achieved respiratory exchange rate (RER=VCO2/VO2) >1.10 at maximal exercise. In Male group, despite correlation between methods (R=0.78; P=0.0001), VO2max estimated by ACSM’s equation was higher than the VO2max of the direct measurement (28.7±3.1 vs. 26.9±6.0 ml/kg/min; P=0.049). Similarly, in Female group there was correlation (R=0.79; P=0.0001), however VO2max estimated by ACSM’s equation was higher than direct measured VO2max (20.3±3.3 vs. 18.8±3.3 ml/kg/min; P=0.0008). In both genders, Bland‐Altman plot analysis suggested a lack of agreement between predicted and direct VO2max.ConclusionIn bout groups, Male and Female, the ACSM’s equation overestimates the VO2max. It seems that ACSM’s equation is not capable of accurately predicting VO2max in men and women with MetS.