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Objective: Comorbidities are found to affect metabolic equivalents (METs). Therefore the main objective of this study was to compare METs (1 MET: oxygen uptake (VO2) 3.5 ml/kg/min) during an incremental shuttle walking test (SWT) between non-cardiac and post-myocardial infarc-tion (MI) men, and secondly to determine any differences in VO2 (ml/kg/min) between flat treadmill walking and the turning during the shuttle walking in non-cardiac subjects. Design: Comparative study. Subjects: Thirty one post-MI (mean (SD) age 63.5 (6.5), range 53–77 years) from phase IV cardiac rehabilitation and 19 non-cardiac (64.6 (7.5), range 51–76 years) men participated. Methods: All subjects performed an SWT, and non