Abstract
Most studies investigating the effects of acute carbohydrate (CHO) ingestion on post-exercise
cytokine responses have involved fasted athletes. This study characterised the effects
of acute CHO beverage ingestion preceded by consumption of a CHO-containing pre-exercise
meal. Sixteen highly-trained male cyclists/triathletes (age: 30.6 ± 5.6 y; V˙O2max: 64.8 ± 4.7 ml · kg · min−1 [mean ± SD]) undertook two cycle ergometry trials involving randomised consumption
of a 10 % CHO beverage (15 mL · kg−1 · hr−1) or water (H2O). Trials were undertaken 2 h after a breakfast providing 2.1 g CHO · kg−1 body mass (BM) (48 kJ · kg−1 BM) and consisted of 100 min steady state cycle ergometry at 70 % V˙O2max followed by a time trial of ∼ 30 min duration. Blood samples were collected pre-,
post- and 1 h post-exercise for measurement of Interleukin (IL)-6, IL-8, IL-10 and
IL-1ra. Time-trial performance was not substantially different between CHO and H2O trials (4.5 %, p = 0.42). Neither IL-6 nor IL-8 responses were substantially reduced
in the CHO compared to the H2O trial. There was a substantial reduction in IL-10 (32 %, p = 0.05) and IL-1ra (43 %,
p = 0.02) responses at 1 h post-exercise with CHO compared to H2O ingestion. In conclusion, the previously shown attenuating effects of CHO ingestion
during exercise on cytokine responses appear reduced when athletes consume a CHO-containing
pre-exercise meal.
Key words
immunity - carbohydrate - athlete - exercise
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Amanda Cox
Australian Institute of Sport
Department of Physiology
PO Box 176
Belconnen 2616
Australia
eMail: amanda.cox@newcastle.edu.au