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Intramyocellular triacylglycerol in prolonged cycling with high and low carbohydrate availability


Johnson, NA and Stannard, SR and Fairburn, KA and Trenell, MI and Sachinwalla, T and Thompson, CH and Thompson, MW, Intramyocellular triacylglycerol in prolonged cycling with high and low carbohydrate availability, Journal of Applied Physiology, 94, (4) pp. 1365-1372 . ISSN 8750-7587 (2003) [Refereed Article]

DOI: doi:10.1152/japplphysiol.00833.2002


Vastus lateralis intramyocellular lipid (IMCL) content was assessed by 1H-magnetic resonance spectroscopy before and after prolonged time trial cycling bouts of ∼3-h duration. Six highly trained male cyclists completed a double-blind, randomized, crossover design of two experimental trials after a strenuous exercise bout and 48 h of high (HC) (9.32 ± 0.08 g · kg -1 · day -1) and low (LC) (0.59 ± 0.21 g · kg -1 · day -1) dietary carbohydrate. Resting IMCL content was significantly higher after LC vs. HC (P < 0.01) and was reduced during exercise by 64 and 57%, respectively. IMCL was not different between conditions after exercise (P > 0.05). The approximately twofold increase in IMCL degradation in LC compared with HC suggests that higher rates of whole body lipid metabolism in LC were in part attributable to a greater IMCL utilization. Four subjects experienced reductions of IMCL in excess of 70% during exercise. To our knowledge, this is the first study to report near depletion of IMCL during prolonged cycling, indicating that IMCL, presumably the triacylglycerol component, may be exhausted by prolonged strenuous exercise.

Item Details

Item Type:Refereed Article
Research Division:Health Sciences
Research Group:Sports science and exercise
Research Field:Exercise physiology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the environmental sciences
UTAS Author:Johnson, NA (Dr Nathan Johnson)
ID Code:32817
Year Published:2003
Web of Science® Times Cited:48
Deposited By:Health Sciences A
Deposited On:2005-05-11
Last Modified:2011-10-12

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