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

Cole, M, Hopker, James G., Wiles, Jonathan, 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 0264-0414. E-ISSN 1466-447X. (doi:10.1080/02640414.2017.1343956) (KAR id:62143)


To assess the effect of carbohydrate and caffeine on gross efficiency (GE), 14 cyclists (V? O2max 57.6 ± 6.3 completed 4 × 2-hour tests at a submaximal exercise intensity (60% Maximal Minute Power). Using a randomized, counter-balanced crossover design, participants con- sumed 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?1, p < 0.001; CAF +CHO = 5.05 ± 0.81 mmol·L?1, p < 0.001; CAF = 4.46 ± 0.75 mmol·L?1; W = 4.20 ± 0.53 mmol·L?1). Carbohydrate ingestion has a small but significant effect on exercise-induced reductions in GE, indicat- ing that cyclists’ feeding strategy should be carefully monitored prior to and during assessment.

Item Type: Article
DOI/Identification number: 10.1080/02640414.2017.1343956
Subjects: R Medicine > RC Internal medicine > RC1235 Physiology of sports
Divisions: Divisions > Division of Natural Sciences > Sport and Exercise Sciences
Depositing User: James Hopker
Date Deposited: 26 Jun 2017 11:32 UTC
Last Modified: 10 Dec 2022 02:45 UTC
Resource URI: (The current URI for this page, for reference purposes)

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