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

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Authors
Scrivin, Rachel
Slater, Gary
Mika, Alice
Rauch, Christopher
Young, Pascale
Martinez, Isabel
Costa, Ricardo J. S.
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2023
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Conference Contribution - Paper in Published Proceedings
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FODMAPs
Carbohydrate loading
Gastrointestinal symptoms
GIS
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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.
Abstract
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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