Carbohydrate Mouth Rinse Mitigates Mental Fatigue Effects on Maximal Incremental Test Performance, but Not in Cortical Alterations

Brietzke, Cayque, Franco-Alvarenga, Paulo Estevão, Canestri, Raul, Goethel, Márcio Fagundes, Vínicius, Ítalo, Painelli, Vitor de Salles, Santos, Tony Meireles, Hettinga, Florentina and Pires, Flávio Oliveira (2020) Carbohydrate Mouth Rinse Mitigates Mental Fatigue Effects on Maximal Incremental Test Performance, but Not in Cortical Alterations. Brain Sciences, 10 (8). p. 493. ISSN 2076-3425

brainsci-10-00493.pdf - Published Version
Available under License Creative Commons Attribution 4.0.

Download (973kB) | Preview
Official URL:


Detrimental mental fatigue effects on exercise performance have been documented in constant workload and time trial exercises, but effects on a maximal incremental test (MIT) remain poorly investigated. Mental fatigue-reduced exercise performance is related to an increased effort sensation, likely due to a reduced prefrontal cortex (PFC) activation and inhibited spontaneous behavior. Interestingly, only a few studies verified if centrally active compounds may mitigate such effects. For example, carbohydrate (CHO) mouth rinse potentiates exercise performance and reduces effort sensation, likely through its effects on PFC activation. However, it is unknown if this centrally mediated effect of CHO mouth rinse may mitigate mental fatigue-reduced exercise performance. After a proof-of-principle study, showing a mental fatigue-reduced MIT performance, we observed that CHO mouth rinse mitigated MIT performance reductions in mentally fatigued cyclists, regardless of PFC alterations. When compared to placebo, mentally fatigued cyclists improved MIT performance by 2.24–2.33 when rinsing their mouth with CHO during MIT. However, PFC and motor cortex activation during MIT in both CHO and placebo mouth rinses were greater than in mental fatigue. Results showed that CHO mouth rinse mitigated the mental fatigue-reduced MIT performance, but challenged the role of CHO mouth rinse on PFC and motor cortex activation.

Item Type: Article
Uncontrolled Keywords: brain regulation; physical performance; cognitive performance; supplementation
Subjects: B100 Anatomy, Physiology and Pathology
C600 Sports Science
C800 Psychology
Department: Faculties > Health and Life Sciences > Sport, Exercise and Rehabilitation
Depositing User: Elena Carlaw
Date Deposited: 29 Jul 2020 10:00
Last Modified: 31 Jul 2021 12:02

Actions (login required)

View Item View Item


Downloads per month over past year

View more statistics