Different Doses of Carbohydrate Mouth Rinse Have No Effect on Exercise Performance in Resistance Trained Women.

Raci Karayigit,Firat Akca,Dicle Aras,Alireza Naderi,Scott Forbes,Ulas Yildirim,Ahmet Mor,Burak Yasli,Mojtaba Kaviani,Aysegul Sisman,Darren Candow

doi:10.3390/ijerph18073463

Abstract

Carbohydrate (CHO) mouth rinse has been shown to enhance aerobic endurance performance. However, the effects of CHO mouth rinse on muscular strength and endurance are mixed and may be dependent on dosage of CHO. The primary purpose was to examine the effects of different dosages of CHO rinse on strength (bench press 1 repetition maximum [1-RM]) and muscular endurance (40% of 1-RM repetitions to failure) in female athletes. Sixteen resistance-trained females (age: 20 ± 1 years; height: 167 ± 3 cm; body mass: 67 ± 4 kg; BMI: 17 ± 2 kg/m2; resistance training experience: 2 ± 1 years) completed four conditions in random order. The four conditions consisted of a mouth rinse with 25 mL solutions containing either 6% of CHO (Low dose of CHO: LCHO), 12% CHO (Moderate dose of CHO: MCHO), 18% CHO (High dose of CHO: HCHO) or water (Placebo: PLA) for 10 s prior to a bench press strength and muscular endurance test. Maximal strength (1-RM), muscular endurance (reps and total volume), heart rate (HR), ratings of perceived exertion (RPE) and glucose (GLU) were recorded each condition. There were no significant differences in strength (p = 0.95) or muscular endurance (total repetitions: p = 0.06; total volume: p = 0.20) between conditions. Similarly, HR (p = 0.69), RPE (p = 0.09) and GLU (p = 0.92) did not differ between conditions. In conclusion, various doses of CHO mouth rinse (6%, 12% and 18%) have no effect on upper body muscular strength or muscular endurance in female athletes.

Highlights

Heart rate significantly increased after exercise (F1,15 = 1250.400, p = 0.01, η2 = 0.98), but there were no significant differences between conditions (F3,45 = 0.478, p = 0.69, η2 = 0.03)
Ispoglou et al [32] demonstrated that 4%, 6% and 8% of carbohydrate mouth rinsing (CMR) had no improvement in aerobic endurance in the postprandial state with either concentration of carbohydrate solutions compared to placebo
Mouth rinsing with 6%, 12% or 18% CHO solutions did not enhance upper body strength or muscular endurance performance in trained females

Summary

Introduction

Ingestion of carbohydrates (CHO) enhances endurance performance (>60 min). CHO ingestion allows higher rates of CHO oxidation and maintenance of plasma glucose during exercise which spares muscle glycogen [1]. Despite sufficient glycogen stores to sustain high intensity exercise beyond 1 h, CHO ingestion has been shown to improve high intensity, short duration, cycling performance (

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