Carbohydrate Mouth Rinse Increases High but Not Low Intensity Repetitions to Failure in Resistance-Trained Males

• Published in: Nutrients Vol. 14; no. 4; p. 875
• Main Authors: Karayigit, Raci, Eser, Mustafa Can, Gur, Fatih, Sari, Cengizhan, Cepicka, Ladislav, Gabrys, Tomasz
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 19-02-2022; MDPI
• Subjects: Adult; Arousal; Body fat; Body mass; Brain research; Carbohydrates; Dietary Carbohydrates; ergogenic aids; Exercise; Fatigue tests; Heart rate; high intensity; Humans; Laboratories; Male; Males; Maltodextrin; Mouth; mouthwash; Mouthwashes - pharmacology; Muscle Strength; muscular endurance; Physical Endurance; Physical fitness; Physical training; Placebos; Resistance Training; Rinsing; Strength training; supplement; Young Adult; rinsing; muscular endurance; ergogenic aids; mouthwash; supplement; high intensity
• ISSN: 2072-6643; 2072-6643
• DOI: 10.3390/nu14040875

Carbohydrate mouth rinsing (CMR) has been shown to enhance exercise performance. However, the influence of CMR on repetitions to failure with different intensities (40% or 80% of 1 RM) is unknown. Therefore, the purpose of this study was to examine the effects of a 6% CMR solution on muscular endurance assessed at 40% and 80% of 1 RM in resistance-trained males. Sixteen resistance-trained males (age: 25 ± 3 years, height: 182 ± 6 cm, body mass: 86 ± 3 kg, body fat: 16 ± 3%, bench press 1 RM: 106 ± 16 kg, resistance training experience: 5 ± 1 years) completed four conditions in random order. The four conditions consisted of ten seconds of mouth rinsing with 25 mL solutions containing either maltodextrin or placebo (sweetened water) prior to performing a bench press muscular endurance test at either 40% of 1 RM or 80% of 1 RM. Total repetitions, heart rate (HR), ratings of perceived exertion (RPE), glucose (GLU) and felt arousal (FA) were recorded for each condition. There was a significant condition by intensity interaction (
= 0.02). CMR significantly increased total repetitions compared with placebo at the higher intensity (80% of 1 RM;
= 0.04), while there was no effect at the lower intensity (
= 0.20). In addition, HR, RPE, GLU and FA did not differ between conditions or across intensities (
> 0.05). In conclusion, CMR-enhanced muscular endurance performed at higher but not lower intensities.