Real-Time Observations of Food and Fluid Timing During a 120 km Ultramarathon

Frontiers in Nutrition
Floris C WardenaarCoen C W G Bongers

Abstract

The aim of the present case study was to use real-time observations to investigate ultramarathon runners' timing of food and fluid intake per 15 km and per hour, and total bodyweight loss due to dehydration. The study included 5 male ultramarathon runners observed during a 120 km race. The research team members followed on a bicycle and continuously observed their dietary intake using action cameras. Hourly carbohydrate intake ranged between 22.1 and 62.6 g/h, and fluid intake varied between 260 and 603 mL/h. These numbers remained relatively stable over the course of the ultra-endurance marathon. Runners consumed food and fluid on average 3-6 times per 15 km. Runners achieved a higher total carbohydrate consumption in the second half of the race (p = 0.043), but no higher fluid intake (p = 0.08). Energy gels contributed the most to the total average carbohydrate intake (40.2 ± 25.7%). Post-race weight was 3.6 ± 2.3% (range 0.3-5.7%) lower than pre-race weight, revealing a non-significant (p = 0.08) but practical relevant difference. In conclusion, runners were able to maintain a constant timing of food and fluid intake during competition but adjusted their food choices in the second half of the race. The large variation in flu...Continue Reading

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Citations

Nov 9, 2019·Current Sports Medicine Reports·Jack Spittler, Lauren Oberle
Jul 13, 2020·Journal of the International Society of Sports Nutrition·Chloé LavouéKeyne Charlot
Nov 5, 2019·Frontiers in Nutrition·Adam D SealStavros A Kavouras
Apr 9, 2020·Nutrients·Giannis ArnaoutisStavros A Kavouras
Dec 30, 2020·Nutrición hospitalaria·Rubén Jiménez-AlfagemeJosé Miguel Martínez Sanz
Jun 3, 2021·International Journal of Environmental Research and Public Health·Kengo IshiharaYasuyuki Nakamura
Jun 3, 2021·International Journal of Environmental Research and Public Health·Soledad ArribalzagaJuan Mielgo-Ayuso

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