Introduction: Resistance training produces a number of acute and chronic adaptations in the musculoskeletal, nervous, cardiovascular, endocrine and immune systems (Saikko, 2015). The aim of this study was to investigate the acid-base responses to three different Circuit Weight Training (CWT) protocols in moderately active individuals. Methods: Twenty-four healthy participants (21.3±2.9 years; 68.8±10.3kg) non-smoking and moderately active individuals completed three CWT sessions on separate occasions. These consisted of machine weights circuit (MC), free weights circuit (FW), and combined aerobic and machine weight circuit (CAM). All circuits had the same duration in time, number of exercises and targeted the same muscle groups. Before commencing the CWT protocols, participants completed a Wingate (WG) and VO2Max incremental test (VM) on different days. Blood samples were taken post test/circuit at 0min, 3min and 5min, measuring pH level, concentration of lactate (La-), Bicarbonate (cHCO3-) and standard base excess (cBase[Ecf]). Results: PH measures were significantly higher at 0min for CAM vs the rest of the tests; CAM continued to have greater values than WG at 3min, and than MC and FW at 5min. La- measures were significantly lower at 0min for CAM vs MC, FW and WG vs FW: at 3min for CMA vs VM, MC:5.69±0.48 vs 9.22±0.50, 10.54±0.89; at 5min for CAM vs VM, WG, MC, FW: 5.04±0.48 vs 9.47±0.65, 9.70±0.55, 10.30±0.77, 8.76±0.74. cHCO3- measures were significantly higher at 0min for WG vs VM, MC, CAM, FW: 24.67±0.64 vs 17.72±0.68, 17.31±0.78, 19.81±0.67, 19.42±0.82; at 5min for CAM vs VM, MC, FW: 19.53±0.64 vs 14.56±0.45, 15.19±0.70, 16.82±0.74. cBase[Ecf] measures were significantly higher at 0min for WG vs VM, MC, CAM, FW and CAM vs FW: -3.94±0.70 vs -10.57±0.63, -11.44±0.94, -7.20±0.73, -8.76±0.82; at 5mins for CAM vs VM, WG, MC, FW: -7.02±0.70 vs -14.32±0.52, -11.65±0.67, -12.62±0.89, -10.16±0.89. Discussion: Taken together, our findings indicate that CAM leads to higher levels of pH, cHCO3-, cBase[Ecf], and lower levels of La-. This suggests that in comparison with CWT and tests, it reached the lowest level of acidosis. This is most likely due to the aerobic component of CAM; thus allowing acid-base regulation to reoccur and homeostasis to be reached. Therefore, CAM would be the most beneficial CWT in the construction of a resistance training program where a high anaerobic capacity is not required.
© Copyright 2016 21st Annual Congress of the European College of Sport Science (ECSS), Vienna, 6. -9. July 2016. Veröffentlicht von University of Vienna. Alle Rechte vorbehalten.