Effect of glucose and sodium chloride mouth rinses on neuromuscular fatigue: A preliminary study

Khong, Teng Keen and Selvanayagam, Victor and Yusof, Ashril (2021) Effect of glucose and sodium chloride mouth rinses on neuromuscular fatigue: A preliminary study. European Journal of Sport Science, 21 (2). pp. 224-230. ISSN 1746-1391, DOI https://doi.org/10.1080/17461391.2020.1730980.

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Carbohydrate (CHO) mouth rinse has been shown to improve endurance performance and maintain the central drive of contracting muscles. Salt (NaCl) mouth rinse solution, often used in dentistry to desensitise the oral cavity to pain, could also activate cortical areas of the brain. Hence, the objective of this preliminary study was to investigate whether CHO (glucose) and NaCl mouth rinses could attenuate the reduction in maximum voluntary contraction (MVC) and sustained MVC (sMVC) following an endurance exercise (30-minute cycling at 70% VO(2)max). Ten subjects (male, age: 22 +/- 1 years, weight: 65.3 +/- 12.4 kg, height: 164.5 +/- 7.5 cm, VO(2)max: 48.3 +/- 6.1 mL kg(-1) min(-1)) completed three trials of 30-minute cycling exercise. In a randomised cross-over study, in each trial, the participants rinsed using either water, 6% glucose, or 6% NaCl solution for 5 s immediately prior to and every 10 min during the cycling exercise. The MVC and sMVC were measured pre and post cycling. Analysis of variance showed significant interaction and time effects for MVC, while for sMVC there was a significant interaction with time and group effects. Both MVC and sMVC were higher post cycling in the glucose and NaCl groups compared to the water group, which suggests that activation of glucose and NaCl oral receptors could better preserve post-exercise force production. This is the first study to show that NaCl mouth rinse can produce a comparable effect on glucose. Hence, mouth rinses may be able to activate other distinct pathways that could attenuate fatigue.

Item Type: Article
Funders: Universiti Malaya [PG173-2014B], University of Malaya Research Ethics Committee [UM.TNC2/RC/HE/UMREC-41]
Uncontrolled Keywords: Carbohydrate; Sodium chloride; Central fatigue; Mouth rinse; Maximal voluntary contraction
Subjects: R Medicine
R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Faculty of Sports and Exercise Science (formerly known as Centre for Sports & Exercise Sciences)
Depositing User: Ms Zaharah Ramly
Date Deposited: 06 Apr 2022 01:50
Last Modified: 06 Apr 2022 01:50
URI: http://eprints.um.edu.my/id/eprint/26964

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