Nutritional and Fluid Intake in a 100-km Ultramarathon
Abstract
The fluid and food intakes of 7 male participants in a 100-km ultramarathon were recorded. The mean exercise time was 10 hr 29 min. Nutrient analysis revealed a mean inlrarace energy intake of 4.233 kJ. with 88.6% derived from carbohydrate. 6.7% from fat, and 4.7% from protein. Fluid intake varied widely. 3.3–1 1.1 L, with a mean of 5.7 L. The mean decrease in plasma volume at 100 km was 7.3%, accompanied by an estimated mean sweat rale of 0.86 L ⋅ hr−1. Blood glucose concentrations remained normal during the event, and free fatty acids and glycerol were elevated both during and at the conclusion of the event. No significant correlations were found between absolute amounts and rates of ingestion of carbohydrate and/or fluid and race performance.
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Mean fluid ingestion rates of ~0.5 L·h−1 have been observed during a road ultra-marathon of 62 miles (100 km), with a broad range in the total volumes consumed (3.3-11.1 L).
“Mean fluid ingestion rates of ~ 0.5 L·h− 1 have been observed during a road ultra-marathon of 62 miles (100 km), with a broad range in the total volumes consumed (3.3–11.1 L) [123].”
From International Society of Sports Nutrition Position Stand: nutritional considerations for single-stage ultra-marathon training and racing (2019) · cites this paper as [123]
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“…to the ones observed in amarathon (354ml · h¯1) (Kruseman et al., 2005), and lower than water intakes observed in a 100-km ultramarathon (540 ml · h¯1) (Fallon et al., 1998), in a marathon (545 ml · h¯1) (Pfeiffer et al., 2012) and during two 160-km ultramarathons (678 and 747 ml · h¯1) (Glace…”
BackgroundNutrient intake and performance during a mountain marathon: an observational study
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“In competition, field research suggests that ultra-endurance athletes finish their races with an energy intake between 36 and 54% of energy expenditure [18, 34].”
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“Overall, hourly carbohydrate intake was slightly above the set target of 40 g/hr and similar to that reported in an earlier account of male athletes (42.8 g/hr) during a 24-hr footrace (Fallon et al., 1998).”
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BackgroundInfluentialSaccharide Composition of Carbohydrates Consumed during an Ultra-endurance Triathlon
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“Therefore, runners should consciously choose food products and know the main sources of energy in ultramarathons (16).”
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“No significant correlations were found between absolute amount and rates of ingestion of carbohydrate and/or fluid and race performance in a 100-km ultramarathon.(2) Percent change in body weight was linearly related to postrace serum sodium concentration but unrelated to performance in the South African Ironman triat…”
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- Authors
- Fallon, K. E., Broad, E., Thompson, M. W., & Reull, P. A.
- ORCID
- Broad, Elizabeth
- Venue
- International Journal of Sport Nutrition
- Publisher
- Human Kinetics
- Published
- 1998-03
- Volume
- 8
- Issue
- 1
- Pages
- 24-35
- ISSN
- 1050-1606 (ISSN-L)
- OpenAlex
- W2156632748
- Cited by
- 69
- References
- 0
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 1 · 2023: 1 · 2021: 1 · 2020: 2 · 2019: 5 · 2018: 7 · 2017: 2 · 2016: 2 · 2015: 3 · 2014: 4 · 2013: 8 · 2012: 3
- FWCI
- 1.43
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- International Journal of Sport Nutrition (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Physiology › Thermoregulation and physiological responses
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
- Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports Performance and Training
- Keywords
- ultramarathon, endurance exercise, fluid intake, carbohydrate intake, energy intake, plasma volume, sweat rate, blood glucose, free fatty acids, glycerol, race performance
- MeSH terms
- Adult, Blood Glucose, Body Weight, Energy Intake, Dietary Carbohydrates, Dietary Fats, Dietary Proteins, Drinking, Fatty Acids, Nonesterified, Glycerol, Hematocrit, Hemoglobins, Humans, Male, Middle Aged, Nutritional Requirements, Plasma Volume, Running, Sweat, Water-Electrolyte Balance
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