Impact of 48-hr carbohydrate loading with varied FODMAPs on exercise-induced gastrointestinal syndrome (EIGS) and running performance

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Scrivin, Rachel
Slater, Gary
Mika, Alice
Rauch, Christopher
Young, Pascale
Martinez, Isabel
Costa, Ricardo J. S.
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Conference Contribution - Paper in Published Proceedings
Ngā Upoko Tukutuku (Māori subject headings)
Carbohydrate loading
Gastrointestinal symptoms
ANZSRC Field of Research Code (2020)
Scrivin, R. A., Slater, G. J., Mika, A., Rauch, C., Young, P., & Coast, R. J. S. (2023, October 27-28). Impact of 48-hr carbohydrate loading with varied FODMAPs on exercise-induced gastrointestinal syndrome (EIGS) and running performance [Conference presentation]. Sports Dietitians Australia Conference 2023, University of the Sunshine Coast, Queensland, Australia.
BACKGROUND: Dietary fermentable oligo-, di-, and monosaccharide and polyol (FODMAP) are known to exacerbate exercise-associated gastrointestinal symptoms (GIS) and impact exercise performance outcomes. AIM: The study aimed to investigate the effects of a high-carbohydrate diet, with varying FODMAP content, before endurance exercise, on gastrointestinal integrity, motility and symptoms, and subsequent exercise performance. METHODS: Twelve recreationally competitive endurance athletes consumed two randomly allocated high-carbohydrate (mean ± SD; 12.1 ± 1.8 g/kg/day) diets on separate occasions, with either high (54.8 ± 10.5 g/day) or low FODMAP (3.0 ± 0.2 g/day) content, with a 7-day washout between. Athletes then completed 2 h of steady state running at 60% V̇ O2max, followed by a 1-h distance test (22.9 ± 1.2 C, 46.4 ± 7.9% RH). Heart rate and RPE were determined pre-exercise and every 15-min during exercise, while Tre was recorded pre- and post-exercise. A 10 g maltodextrin solution (10% w/v) was consumed pre exercise and every 20 min during steady-state exercise. A 150 mL solution containing 20 g of lactulose was consumed 30 min into the distance performance test to determine orocecal transit time (OCTT). Blood was collected pre-exercise, 0-, 1- and 2-h post-exercise to determine plasma concentrations of cortisol, I-FABP, sCD14 and CRP. Breath H2 and GIS were determined preexercise, every 15 min during exercise, and throughout recovery. RESULTS: A main effect over time (MEOTime) for heart rate, RPE and plasma cortisol (p < 0.01) was observed, with no trial differences between HCHF and HCLF. Tre pre- to post-exercise increased significantly for each trial (p < 0.001); however, no trial differences were found. The magnitude of change pre- to peak post-exercise for I-FABP (overall mean ± SD: 894 ± 763 pg/mL), sCD14 (809 ± 612 ng/mL) and CRP (0.9 ± 0.9 ng/mL) was not different between trials. OCTT did not differ between trials (89 ± 56 min), as did the total distance completed during the 1-h distance performance test (10 ± 1.6 km). Greater total-GIS severity was reported pre-exercise (4.3 ± 4.4, p = 0.042), while gut discomfort (15.8 ± 9.0, p = 0.034) and upper-GIS (5.7 ± 4.8, p = 0.042) were higher during exercise on HCHF. Total-GIS (4.9 ± 6.8, p = 0.043) and gut discomfort (3.4 ± 4.4, p = 0.042) were higher during the 2-h recovery period in HCLF. CONCLUSIONS: A 48-h HCLF diet before endurance running leads to less Ex-GIS before and during exercise, but this does not impact physiological strain, gastrointestinal integrity or motility, or exercise performance.
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