Biology of Sport
eISSN: 2083-1862
ISSN: 0860-021X
Biology of Sport
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3/2018
vol. 35
 
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abstract:
Original paper

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

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

Biol Sport. 2018;35(3):237–244
DOI: https://doi.org/10.5114/biolsport.2018.77824
Online publish date: 2018/08/30
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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).
keywords:

Repeated sprint ability (RSA), Reaction time, Movement time, Accuracy, Brain

  
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