Watesinee KhuangsirikulWattana JalayondejaRungchai ChuanchaiyakulRungroj KrittayaphongChunhakasem ChotinaiwattarakulPansak LaksanabunsongMahidol University. Faculty of Physical TherapyMahidol University. College of Sports Science and TechnologyMahidol University. Faculty of Medicine Siriraj Hospital2018-04-242018-04-242018-042014Journal of The Medical Association of Thailand. Vol.97, No.7 (2014), S6-S90125-2208https://repository.li.mahidol.ac.th/handle/20.500.14594/10994Objective: To investigate the relationship among metabolic equivalents of an exercise stress test (METs of EST), demographic parameters (age, body weight, height, BMI), peak oxygen consumption (VO2 peak), and six-minute walk distances (6MWD) determined from a six-minute walk test (6MWT). Material and Method: Exercise capacity was estimated by a 6MWT and EST at the sixth week post operation in post coronary artery bypass graft (post CABG, n = 17) and post percutaneous coronary intervention (post PCI, n = 13) patients. Results: METs of EST showed: high correlation (p < 0.01) with VO2 peak of 6MWT (r = 0.94), 6MWD (r = 0.92); muscle strength (r = 0.78), moderate correlation (p < 0.01) with height (r = 0.53); negative correlation with age (r = -0.50). Low correlation was found (p < 0.05) with step length (r = 0.43), and weight (r = 0.38). No correlation was found among METs of EST and rating perceived exertion (RPE) of EST and 6MWT. The multiple linear regression equation for explaining METs of EST is as follows: METs of EST = -2.94+0.02 (6MWD), (r = 0.923, R2 = 0.85, p < 0.001). Conclusion: The 6MWT may possibly be used as an alternative choice for estimating energy expenditure to design exercise programs for these post operation groups.engMahidol UniversityMetabolic equivalentsPeak oxygen consumptionPost coronary artery bypass graftPost percutaneous coronary interventionSix-minute walk testArticleThe Medical Association of Thailand