Acute Effects of Different Weight Training Methods on Energy Expenditure in Trained Men

Introduction: The Weight training has been widely used as strategy of reduction and weight control, so the energy expenditure (EE) contributes significantly to this process. Objective: To compare the acute effects of the circuit method (CM) with the traditional method (TM) on the EE. Methods: This research had a randomized crossover design; the sample consisted of ten adult men recreationally trained aged between 18 to 29 years. There were two experimental sessions with seven-day wash out: in CM the exercises were performed by alternating segment in form of stations, during TM the exercises were performed in consecutive sets. Both training methods followed the same sequence of eight exercises with the same total work: 60% of 1RM, 24 sets/stations and ten repetitions. The collection of blood lactate was performed at rest and the every three sets/stations. The expired air was collected per 30 minutes before and ~31 minutes during all the training sessions. The aerobic exercise (AEEE, kj) and of rest interval (RIEE, kj) EEs were estimated by indirect calorimetry by measuring oxygen consumption and the anaerobic EE (AEE, kj) by blood lactate concentration ([La]). The total EE (TEE, kj) was recorded by the sum of AEE, RIEE and AEE. Results: Data showed that the AEE was greater in TM than the CM; however, the AEEE, RIEE and the TEE were not significantly different between the methods. The TM presented higher [La] than the CM. Conclusion: We conclude that the CM and TM produces similar EE during and post-workout, however, one realizes that the TM uses more anaerobic system than the MC.