The effects of acute carbohydrate and caffeine feeding strategies on cycling efficiency

Cole, Matthew and Hopker, James. G. and Wiles, Jonathan. D. and Coleman, Damian. A. (2017) The effects of acute carbohydrate and caffeine feeding strategies on cycling efficiency. Journal of Sports Sciences, 36 (7). pp. 817-823. ISSN 1466-447X

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Abstract

To assess the effect of carbohydrate and caffeine on gross efficiency (GE), 14 cyclists (V̇O 57.6 ± 6.3 ml.kgmin) completed 4 × 2-hour tests at a submaximal exercise intensity (60% Maximal Minute Power). Using a randomized, counter-balanced crossover design, participants consumed a standardised diet in the 3-days preceding each test and subsequently ingested either caffeine (CAF), carbohydrate (CHO), caffeine+carbohydrate (CAF+CHO) or water (W) during exercise whilst GE and plasma glucose were assessed at regular intervals (~30 mins). GE progressively decreased in the W condition but, whilst caffeine had no effect, this was significantly attenuated in both trials that involved carbohydrate feedings (W = -1.78 ± 0.31%; CHO = -0.70 ± 0.25%, p = 0.008; CAF+CHO = -0.63 ± 0.27%, p = 0.023; CAF = -1.12 ± 0.24%, p = 0.077). Blood glucose levels were significantly higher in carbohydrate ingestion conditions (CHO = 4.79 ± 0.67 mmol·L p < 0.001; CAF+CHO = 5.05 ± 0.81 mmol·L, p < 0.001; CAF = 4.46 ± 0.75 mmol·L; W = 4.20 ± 0.53 mmol·L). Carbohydrate ingestion has a small but significant effect on exercise-induced reductions in GE, indicating that cyclists' feeding strategy should be carefully monitored prior to and during assessment.

Item Type:	Article
Identification Number:	10.1080/02640414.2017.1343956
Dates:	Date Event 23 June 2017 Published Online 22 May 2017 Accepted
Subjects:	CAH02 - subjects allied to medicine > CAH02-06 - allied health > CAH02-06-02 - nutrition and dietetics CAH03 - biological and sport sciences > CAH03-02 - sport and exercise sciences > CAH03-02-01 - sport and exercise sciences
Divisions:	Faculty of Health, Education and Life Sciences > College of Health and Care Professions
Depositing User:	Matthew Cole
Date Deposited:	25 Apr 2018 13:37
Last Modified:	03 Mar 2022 12:21
URI:	https://www.open-access.bcu.ac.uk/id/eprint/5857

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