Kolhydrat förbättrar prestationsförmågan oavsett om man är fastande eller ej

[King Grub]

PURPOSE:

We tested the hypothesis that carbohydrate ingestion during exercise improves time trial (TT) performance and that this carbohydrate-induced improvement is greater when carbohydrates are ingested during exercise in a fasted rather than a fed state.

METHODS:

Nine males performed 105 min of constant-load exercise (50% of the difference between the first and second lactate thresholds), followed by a 10-km cycling TT. Exercise started at 9 am, 3 h after either breakfast (FED, 824 kcal, 67% carbohydrate) or a 15-h overnight fast (FAST). Before exercise, after every 15 min of exercise and at 5 km of the TT, participants ingested 2 mL.kg-1 body mass of a non-caloric sweetened solution containing either carbohydrate (8% of maltodextrin, CHO) or placebo (0% carbohydrate, PLA).

RESULTS:

Irrespective of the fasting state, when carbohydrate was ingested during exercise, the rating of perceived exertion (RPE) was lower throughout the constant-load exercise, while the plasma glucose concentration and carbohydrate oxidation were higher during the last stages of the constant-load exercise (P<0.05). Consequently, TT performance was faster when carbohydrate was ingested during exercise (18.5 ± 0.3 and 18.7 ± 0.4 min for the FEDCHO and FASTCHO conditions, respectively) than when the placebo was ingested during exercise (20.2 ± 0.8 and 21.7 ± 1.4 min for the FEDPLA and FASTPLA conditions, respectively), regardless of fasting.

CONCLUSION:

These findings indicate that even when breakfast is provided before exercise, carbohydrate ingestion during exercise is still beneficial for exercise performance. However, ingesting carbohydrate during exercise can overcome a lack of breakfast.

Scand J Med Sci Sports. 2019 Jan 23. Cycling TT performance is improved by carbohydrate ingestion during exercise regardless of a fed or fasted state.

[tomten1]

Bör man bry sig om prestationsförmågan? Det är väl stora biceps vi vill ha?