Acceso usuarios
Rodrigo Rodrigues, Rodrigo de Azevedo Franke, Bruno C. Teixeira, Rodrigo C. O. Macedo, Fernando Diefenthaeler, Bruno Manfredini Baroni, Marco Aurélio Vaz
We investigated the effects of binge drinking on maximal strength, time to exhaustion during a high-intensity isometric fatigue protocol, and neuromuscular responses of the elbow flexor muscles. Ten young male participants were randomized in two conditions: (1) alcohol consumption (ALC) or (2) placebo consumption (PLA). In each condition, volunteers ingested 1g of alcohol per kg of body mass of alcoholic beer (ALC) or non-alcoholic beer (PLA). Neuromuscular performance (elbow flexors peak torque and time to exhaustion – TTE - during an isometric fatigue protocol at 70% of peak torque) and EMG parameters (amplitude and median frequency) of biceps brachii (BB) and brachioradialis (BRA) were assessed before and after drink ingestion. A breath alcohol concentration of 1.1 ± 0.25 mg/L was observed in ALC condition. Torque was similar between-conditions (p = 0.76) and condition*moment interaction (p = 0.92), with a significant reduction in post in both conditions (p = 0.01; ALC: -4.4%; PLA: -4.7%). TTE and maximal EMG amplitude of BB were not affected by conditions and moments (p > 0.05). Maximal EMG amplitude of BRA was reduced in post in both conditions (ALC: -16.4%; PLA: -14.6%). EMG amplitude of BB and BRA during the fatigue protocol, the behavior was similar between moments and conditions (p > 0.05) and we only observed an increase during protocol (p < 0.05). Median frequency of BB was higher in PLA compared to ALC (+9.8%). Decreases were observed in both muscles during protocol (p < 0.001). Our results revealed that binge drinking did not alter maximal strength, time to exhaustion during high-intensity isometric fatigue protocol, and neuromuscular responses.
