Carbohydrate Mouth Rinsing Procedure duringRepeated-sprints Exercise inFasted State: Effects on Physical and Cognitive Performance

Karim Chamari, Anissa Cherif, Romain Meeusen, Joong Ryu, Lee Taylor, Karim Kammoun, Mohamed Amine Fenneni, Abdulaziz Farooq, Abdul Rashid Aziz, Bart Roelands

Research output: Contribution to journalMeeting abstract (Journal)


Intermittent fasting (IF) is used for many reasons across the globe. Three-days IF
(3-d IF: no eating/drinking during daylight hours) has been shown to reduce physical and cognitive performance in a repeated sprint effort session. Carbohydrate (CHO) mouth rinse (CHO-MR) has shown efficacy in attenuating some of these decrements for different efforts (i.e., endurance exercise), yet CHO-MR has not been utilized within a repeated sprint (RS) exercise 3-d IF paradigm with associated cognitive performance assessment PURPOSE Determine carbohydrate mouth rinsing (CHOMR) effects on physical and cognitive performance during repeated-sprints (RS) after 3 days of intermittent fasting (abstaining from eating/drinking during daylight hours). METHOD In a randomized, counter-balanced and double-blinded manner, 15 active healthy males performed a RS-protocol (RSP) [2 sets (5×5-s maximal sprints interspersed with 25-s rest periods and 3-min of recovery between sets) on
an instrumented motorized treadmill with embedded force plates) in three conditions [Control (CON)/(no-MR), Placebo-MR (PLA-MR; 0% maltodextrin), and CHO-MR (10% maltodextrin)]. Participants rinsed their mouth with either 10-mL of PLA-MR or CHO-MR solution for 5-s before each sprint in the PLA-MR and CHO-MR conditions.
Reaction time (RTI) tasks (simple and complex) were assessed pre-, mid- and, post-RSP. ANOVA with repeated measures was used to analyze the data RESULTS There was no statistical main effect of CHO-MR on sprints (i) mean power, (ii) mean speed, and (iii) vertical stiffness compared with PLA-MR and CON conditions. There was also no statistical main effect of CHO-MR on simple- and complex-task (i) accuracy, (ii) movement time, and (iii) reaction time. CONCLUSION Though CHO-Mouth rinsing has been shown to be effective at improving performance in other exercise modalities, the present study showed that frequent CHO mouth rinsing did not affect sprint performance or reaction time during an intensive repeated sprint protocol.
Original languageEnglish
Pages (from-to)719-719
Number of pages1
JournalMedicine & Science in Sports & Exercise
Issue number5
Publication statusPublished - May 2017
EventACSM 64th annual congres - Denver, Denver, United States
Duration: 31 May 20174 Jun 2017

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