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Beverages 2018, 4(2), 44; https://doi.org/10.3390/beverages4020044

The Development of a Menthol Solution for Use during Sport and Exercise

1
School of Social Sciences, Humanities & Law, Teesside University, Middlesbrough TS3 1BX, UK
2
Centre for Sport Science & Human Performance, WINTEC, Hamilton 3288, New Zealand
3
Pro-Football Support Ltd., Huddersfield HD7 5BQ, UK
4
School of Sport, Exercise & Rehabilitation Sciences, University of Birmingham, Birmingham B15 2TT, UK
*
Author to whom correspondence should be addressed.
Received: 3 April 2018 / Revised: 6 June 2018 / Accepted: 7 June 2018 / Published: 11 June 2018
(This article belongs to the Special Issue Functional Beverages, from Idea to Functionality)
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Abstract

Menthol mouth-swilling has been shown to improve performance across differing exercise modalities, yet no work has been conducted to ascertain the preferred concentration of menthol within a swill. Colour has also been shown to influence psychophysiological outcomes, and may influence the efficacy of ergogenic aids. We conducted two experiments: one to ascertain preferred menthol concentration (0.005–0.105% menthol), the second to assess colour preference (Light Blue, Dark Blue, Light Green, Dark Green, Red). Participants rated swills for Smell, Taste, Freshness, Mouth Feel and Irritation (plus Appearance in the second trial) via 15 cm Visual Analogue Scales (VAS), having swilled and expectorated 25 mL of fluid. Both trials employed a crossover design, with tasting order assigned by Latin squares. Differences were assessed for statistical significance (p < 0.05) using one-way repeated measures ANOVAs. Standardised mean differences ±90% confidence intervals were calculated to assess the magnitude of any observed differences. No significant differences were found between concentrations for total VAS score, but higher concentrations demonstrated a greater number of small effects. Similarly, no significant differences between colours were found. Small effects were found when Light Green was compared to Dark Green and Red. Effects were trivial when Light Green was compared to Light Blue (0.05 ± 0.20) and Dark Blue (0.19 ± 0.32). We recommend athletes employ a Light Green or Light Blue 0.1% menthol mouth-swill. View Full-Text
Keywords: menthol; exercise; ergogenic aid; mouth swilling menthol; exercise; ergogenic aid; mouth swilling
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Best, R.; Spears, I.R.; Hurst, P.; Berger, N.J.A. The Development of a Menthol Solution for Use during Sport and Exercise. Beverages 2018, 4, 44.

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