Abstract
Food intake and energy expenditure (EE) were studied in five cyclists during the 22-day
race of the Tour de France. The course is about 4000 km including 30 mountain passages
(up to 2700 m altitude) and can be considered as one of the most strenuous endurance
endeavors. Nutritional intake was calculated from daily food records. EE was estimated
from sleeping time and the low activity period. EE during cycling was predicted based
on detailed information.
Mean energy intake (EI) was 24.7 MJ with a highest mean daily EI of 32.4 MJ. Mean
EE was 25.4 MJ with a highest mean daily EE of 32.7 MJ. Relative contribution of protein,
CHO, and fat was 15,62, and 23 En% resp. 49% of EI was taken during the race resulting
in a CHO intake of 94 g·h-1 representing 69 en%. It is questioned whether this amount of CHO is optimal in relation
to CHO oxidation and performance.
About 30% from CHO intake came from CHO-rich liquids. High EI resulted in high Ca
and Fe intake. For vitamins, especially B1 , this relation was not found. Vitamin B1 nutrient density dropped to 0.25 mg/4.2 MJ during the race caused by a large intake
of refined CHO-rich food items. However, vitamin supplementation was high. Daily water
intake was 6.71 with extremes up to 11.81. Therefore, the strategy of intake of large
quantities of CHO-rich liquids seems to be the appropriate answer to maintain energy
and fluid balance under these extreme conditions.
Key words
energy expenditure - food intake - endurance athletes - cycling - carbohydrate metabolism
- vitamins
