Physical exercise is used for the promotion and maintenance of good health and for the improvement of physical fitness. Both endurance and resistance exercises are needed to carry out a complete training program. Because time may be a barrier to physical exercise practice, the aim of this study was to verify whether the order of execution of endurance and resistance exercises, in concurrent training, has different effects on the metabolic responses during recovery. Thirteen healthy women [24.40 (1.67) years, Mean (SD)] were investigated for energy expenditure (EE), oxygen consumption (VO₂), ventilation (Ve), respiratory frequency (RF), proportion of oxygen in expired air (FeO₂) and ratings of perceived exertion (RPE) both before and after three concurrent endurance and resistance trainings, carried out in different orders: endurance-resistance training (ERT), resistance-endurance training (RET) and alternating endurance-resistance training (AERT). AERT elicited a significantly greater increase of EE, VO₂, and Ve and a greater decrease of FeO₂. ERT elicited a lower increase of RPE. Acute post-exercise physiological responses to concurrent endurance and resistance physical exercise seem to depend on the order of execution of the two parts: among the selected protocols, AERT seems to elicit the best responses.

• The concurrent execution of both endurance and resistance exercise, in the same training session, could be a practical solution to conform to guidelines for health in the presence of lack of time.

• The order of concurrent execution of both endurance and resistance exercise, in the same training session, influences the amplitude of some post-exercise physiological responses.