Caffeine alters thermoregulatory responses to exercise in the heat only in caffeine-habituated individuals: a double-blind placebo-controlled trial
Lindsey Hunt, Lily Hospers, James W. Smallcombe, Yorgi Mavros, Ollie Jay
Abstract
We provide empirical evidence that acute caffeine ingestion exerts a thermoregulatory effect during exercise in the heat in caffeine-habituated individuals but not in nonhabituated individuals. Specifically, caffeine habituation was associated with a greater rise in esophageal temperature with caffeine compared with placebo, which appears to be driven by a blunted skin blood flow response. In contrast, no thermoregulatory differences were observed with caffeine in nonhabituated individuals. Caffeine did not affect sweating responses during exercise in the heat.
Topics & Concepts
ThermoregulationCaffeinePlaceboIngestionInternal medicineAnimal scienceHeat stressMedicineEndocrinologyChemistryAnesthesiaBiologyPathologyAlternative medicineThermoregulation and physiological responsesExercise and Physiological ResponsesCoffee research and impacts