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Citation

Kinrade EJ & Galloway SD (2021) Dietary Observations of Ultra-Endurance Runners in Preparation for and During a Continuous 24-h Event. Frontiers in Physiology, 12, Art. No.: 765888. https://doi.org/10.3389/fphys.2021.765888

Abstract
Carbohydrate (CHO) intake recommendations for events lasting longer than 3h indicate that athletes should ingest up to 90g.h.?1 of multiple transportable carbohydrates (MTC). We examined the dietary intake of amateur (males: n=11, females: n=7) ultra-endurance runners (mean age and mass 41.5±5.1years and 75.8±11.7kg) prior to, and during a 24-h ultra-endurance event. Heart rate and interstitial glucose concentration (indwelling sensor) were also tracked throughout the event. Pre-race diet (each 24 over 48h) was recorded via weighed intake and included the pre-race meal (1–4h pre-race). In-race diet (24h event) was recorded continuously, in-field, by the research team. Analysis revealed that runners did not meet the majority of CHO intake recommendations. CHO intake over 24–48h pre-race was lower than recommended (4.0±1.4g·kg?1; 42±9% of total energy), although pre-race meal CHO intake was within recommended levels (1.5±0.7g·kg?1). In-race CHO intake was only in the 30–60g·h?1 range (mean intake 33±12g·h?1) with suboptimal amounts of multiple transportable CHO consumed. Exercise intensity was low to moderate (mean 68%HRmax 45%VO2max) meaning that there would still be an absolute requirement for CHO to perform optimally in this ultra-event. Indeed, strong to moderate positive correlations were observed between distance covered and both CHO and energy intake in each of the three diet periods studied. Independent t-tests showed significantly different distances achieved by runners consuming ≥5 vs.

Keywords
multiple transportable carbohydrates; sport; continuous glucose monitors; exercise, nutrition

Journal
Frontiers in Physiology: Volume 12

• Kinrade And Galloway 2021 Ultra Runners Study