Repeated-sprints exercise in daylight fasting: carbohydrate mouth rinsing does not affect sprint and reaction time performance

• Main Authors: Anissa Cherif (Author), Romain Meeusen (Author), Joong Ryu (Author), Lee Taylor (Author), Abdulaziz Farooq (Author), Karim Kammoun (Author), Mohamed Amine Fenneni (Author), Abdul Rashid Aziz (Author), Bart Roelands (Author), Karim Chamari (Author)
• Format: Book
• Published: Termedia Publishing House, 2018-08-01T00:00:00Z.
• Subjects: article
• Online Access: Connect to this object online.
• Notes: 0860-021X; 2083-1862; 10.5114/biolsport.2018.77824
• Keywords: Repeated sprint ability (RSA); Reaction time; Movement time; Accuracy; Brain; Sports medicine; RC1200-1245; Biology (General); QH301-705.5
• Source: Biology of Sport, Vol 35, Iss 3, Pp 237-244 (2018)

To determine the effect of carbohydrate mouth rinsing (CHO-MR) on physical and cognitive performance during repeated-sprints (RS) after 3 days of intermittent fasting (abstaining from food and fluid 14 h per day). In a randomized and counter-balanced manner 15 active healthy males in a fasted state performed a RS-protocol [RSP; 2 sets (SET1 and SET2) of 5×5 s maximal sprints, with each sprint interspersed with 25 s rest and 3 min of recovery between SET1 and SET2] on an instrumented non-motorized treadmill with embedded force sensors under three conditions: i) Control (CON; no-MR), ii) Placebo-MR (PLA-MR; 0% maltodextrin) and iii) 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. Sprint kinetics were measured for each sprint and reaction time (RTI) tasks (simple and complex) were assessed pre-, during- and post-RSP. There was no statistical main effect of CHO-MR on mean power, mean speed, and vertical stiffness during the sprints between the PLA-MR and CON condition. Additionally, no statistical main effect for CHO-MR on accuracy, movement time and reaction time during the RTI tasks was seen. CHO-MR did not affect physical (RSP) or cognitive (RTI) performance in participants who had observed 3 days of intermittent fasting (abstaining from food and fluid 14 h per day).