Fuel kinetics during intense running and cycling when fed carbohydrate

Exercise times to exhaustion were significantly longer during cycling than running, with durations of 96 minutes and 63 minutes, respectively.

• Both cycling and running trials had identical metabolic rates, with VO2 values of 3.51 L.min-1.
• Blood glucose oxidation rates were similar during both activities, at 3.8 mmol.min-1 for cycling and 3.9 mmol.min-1 for running.
• Higher blood glucose concentrations were observed at exhaustion during running compared to cycling, measuring 7.0 mmol.l-1 versus 5.8 mmol.l-1.
• Total carbohydrate oxidation rates were significantly greater during cycling (24.0 mmol C6.min-1) than running (21.7 mmol C6.min-1).
• Muscle glycogen contribution to energy production was similar at exhaustion for both activities, at 68% for cycling and 65% for running.

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