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Improved Gross Efficiency during Long Duration Submaximal Cycling Following a Short-term High Carbohydrate Diet.

Cole, Mike J., Coleman, Damian A, Hopker, James G., Wiles, Jonathan (2014) Improved Gross Efficiency during Long Duration Submaximal Cycling Following a Short-term High Carbohydrate Diet. International journal of sports medicine, 35 (3). pp. 265-269. ISSN 1439-3964. (doi:10.1055/s-0033-1348254) (KAR id:36029)

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http://dx.doi.org/10.1055/s-0033-1348254

Abstract

To assess the effect of dietary manipulation on gross efficiency (GE), 15 trained male cyclists completed 3×2 h tests at submaximal exercise intensity (60% Maximal Minute Power). Using a randomized, crossover design participants consumed an isoenergetic diet (~4 000 kcal.day-1) in the 3 days preceding each test, that was either high in carbohydrate (HighCHO, [70% of the total energy derived from carbohydrate, 20% fat, 10% protein]), low in carbohydrate (LowCHO, [70% fat, 20% carbohydrate, 10% protein]) or contained a moderate amount of carbohydrate (ModCHO, [45% carbohydrate, 45% fat, 10% protein]). GE along with blood lactate and glucose were assessed every 30 min, and heart rate was measured at 5 s intervals throughout. Mean GE was significantly greater following the HighCHO than the ModCHO diet (HighCHO=20.4%±0.1%, ModCHO=19.6±0.2%; P<0.001). Additionally, HighCHO GE was significantly greater after 25 min (P=0.015) and 85 min (P=0.021) than in the LowCHO condition. Heart rate responses in the HighCHO condition were significantly lower than during the LowCHO tests (P=0.005). Diet had no effect on blood glucose or lactate (P>0.05). This study suggests that before the measurement of gross efficiency, participants' diet should be controlled and monitored to ensure the validity of the results obtained.

Item Type: Article
DOI/Identification number: 10.1055/s-0033-1348254
Uncontrolled keywords: cycling - carbohydrate - gross efficiency - submaximal - diet
Subjects: R Medicine > RC Internal medicine > RC1200 Sports medicine
Divisions: Divisions > Division of Natural Sciences > School of Sport and Exercise Sciences
Depositing User: James Hopker
Date Deposited: 05 Nov 2013 20:47 UTC
Last Modified: 16 Feb 2021 12:48 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/36029 (The current URI for this page, for reference purposes)
Hopker, James G.: https://orcid.org/0000-0002-4786-7037
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