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

Acute carbohydrate and caffeine feeding strategies on cycling efficiency.pdf - Accepted Version

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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:
Date: 23 June 2017
Subjects: B400 Nutrition
C600 Sports Science
Divisions: Faculty of Health, Education and Life Sciences > School of Health Sciences
REF UoA Output Collections > REF2021 UoA24: Sport and Exercise Sciences, Leisure and Tourism
Depositing User: Matthew Cole
Date Deposited: 25 Apr 2018 13:37
Last Modified: 08 Oct 2020 13:43

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