Improved gross efficiency during long duration submaximal cycling following a short-term high carbohydrate diet

Cole, M., Coleman, D. A., Hopker, J. and Wiles, J. (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 0172-4622.

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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
Subjects: G Geography. Anthropology. Recreation > GV Recreation Leisure > GV0558 Sports science
Divisions: pre Nov-2014 > Faculty of Social and Applied Sciences > Sport Science, Tourism and Leisure
Depositing User: Dr Damian Coleman
Date Deposited: 16 Sep 2014 13:49
Last Modified: 08 Dec 2017 09:24
URI: https://create.canterbury.ac.uk/id/eprint/12641

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Last edited: 29/06/2016 12:23:00