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The Journal of Sports Medicine and Physical Fitness 2021 Sep 09

DOI: 10.23736/S0022-4707.21.12125-5


language: English

Caffeine co-ingested with carbohydrate on performance recovery in national-level paddlers: a randomized, double-blind, crossover, placebo-controlled trial

Homeyra BARZEGAR 1, Hamid ARAZI 1 , Hamid MOHEBBI 1, Mohsen SHEYKHLOUVAND 1, Scott C. FORBES 2

1 Department of Exercise Physiology, Faculty of Sport Sciences, University of Guilan, Rasht, Iran; 2 Department of Physical Education Studies, Brandon University, Brandon, Manitoba, Canada


BACKGROUND: Caffeine enhances muscle glycogen re-synthesis post exercise; however, the next-day effects on recovery are unknown. The present study aimed to examine the effects of carbohydrate (CHO) supplementation with or without caffeine (CAF) 24-h following exhaustive exercise on time trial performance in elite paddling athletes.
METHODS: Nine highly trained male paddlers (21 ± 2 y) completed three experimental trials in a randomized, double-blind, crossover manner. Following an exhaustive exercise session (20-km timed paddle) participants ingested: (i) 0.6 g/kg of carbohydrate (CHO), (ii) 0.6 g/kg of carbohydrate with 6 mg/kg of caffeine (CAF+CHO), (iii) or placebo (PLA), at four time-points (immediately after, and 2, 6, and 12-h post-exercise) in addition to their typical dietary intake. After 24 h, 5 attempts of on-water 500-m paddling time-trial was performed, and the average time was recorded. Blood samples were taken at rest and following both the 20-km and the 5×500 m exercise to determine changes in plasma cortisol, insulin, and glucose.
RESULTS: There was a significant main effect of condition (P<0.001), with post hoc analysis revealing that both CHO conditions (CHO: 98.7 ± 2.8 s, P = 0.0003; CAF+CHO: 97.9 ± 2.3 s, P = 0.0002) were significantly faster compared to PLA (101.0 ± 3.1 s), however CAF did not augment time trial performance compared to CHO (P = 0.16). There was no significant condition by time interactions for glucose, cortisol, or insulin before and after the 20-km depleting exercise and 500-m time trial.
CONCLUSIONS: In elite male paddlers, CHO, independent of caffeine, enhanced time trial performance 24 hours following exhaustive exercise.

KEY WORDS: Sports nutrition; Physical performance; Canoe sprint; Ergogenic

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