ENDURANCE – NUTRITION – CARBS – BIKING


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IMPROVED GROSS EFFICIENCY DURING LONG DURATION SUBMAXIMAL CYCLING FOLLOWING SHORT-TERM CARB DIET


AIM
– Assess effect of dietary manipulation on gross efficiency (GE)
DESIGN
– 15 trained male cyclists completed 3×2 hr tests at submaximal exercise intensity (60% Maximal Minute Power)

– approx. 4 000 kcal.day) in the 3 days preceding each test, that was either:
(1) high in carbohydrate (HighCHO, [70% of the total energy derived from carbohydrate, 20% fat, 10% protein])
(2) low in carbohydrate (LowCHO, [70% fat, 20% carbohydrate, 10% protein])
(3) contained a moderate amount of carbohydrate (ModCHO, [45% carbohydrate, 45% fat, 10% protein]).
RESULTS
(1) Mean GE was significantly greater following the HighCHO than the ModCHO diet (HighCHO=20.4%±0.1%, ModCHO=19.6±0.2%)
(2) Additionally, HighCHO GE was significantly greater after 25 min and 85 min than in the LowCHO condition
(3) Heart rate responses in the HighCHO condition were significantly lower than during the LowCHO tests
(4) Diet had no effect on blood glucose or lactate


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