Fitness
Heat Stress Gut Motility
Heat stress gut motility disrupts digestion in hot humid runs—nausea and loose stools rise as blood shifts to cooling and the gut receives less flow.
Heat stress gut motility speeds or disrupts digestion when core temperature rises—nausea, reflux, and loose stools cluster on humid long runs even with adequate carbs. Blood shifts to skin for cooling, compounding splanchnic hypoperfusion.
Slow early miles, increase sodium and fluid, and acclimate before race-pace heat blocks.
Common questions
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Should you skip eating during hot long runs?
Do not drop all carbs—use tested lower-fiber, lower-osmolarity fuel with extra fluid and sodium. Skipping fuel invites bonk while heat still stresses the gut.
Related terms
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