Acute Response Of Blood Glucose After Two Resistance Training Protocols With Different Execution Velocities

Abstract

PURPOSE: Studies have demonstrated that a single session of resistance training (RT) can reduce glycemia in subjects with or without diabetes. The aim of this study was to compare the acute response of blood glucose after 2 resistance training protocols with different execution velocities in amateur weightlifting athletes. METHODS: A randomized clinical trial was conducted in 24 amateur weightlifting athletes (23.5± 6.2 years). The participants were randomized into 2 groups: high velocity (MV, n =12) or low velocity (LV, n =12). The RT training protocol was based on a session with these characteristics: 3 sets of 12 repetitions at 60% of a maximum repetition in each of the exercises (bench press, squat and military press). The only difference between the training session was that the MV group performed all the repetitions at 100% of their maximum velocity and the LV group performed at 50%. This variable was controlled with the T-force system. An oral glucose tolerance test (OGTT) was conducted with metabolic measurements immediately after each RE protocol and every 30 min until 120 min of recovery. For the statistical analysis, the area under the blood glucose curve (AUC) was calculated at each time point. Cohen’s d for effect size were also calculated to determine the magnitude of the group differences. The criteria to interpret the magnitude of the ES was as follows: trivial (< 0.2), small (0.2-0.59), moderate (0.60-1.19), large (1.2-2.0), or very large (> 2.0) RESULTS: The responses of blood glucose following each protocol and OGTT was similar in all groups, reaching the glycemic peak at 30 min of recovery. However, The MV group exhibited significantly lower values in the AUC when compared with LV group over two hours monitoring period (P=0.021, ES=1.198). CONCLUSIONS: The present study showed that RT at different velocities can generate different metabolic responses. In conclusion, the results of this study indicated that RT at a high velocity could be the optimum for postprandial glucose control.