Exercise heat acclimation has minimal effects on left ventricular volumes, function and systemic hemodynamics in euhydrated and dehydrated trained humans
Gavin Travers, José González‐Alonso, Nathan R Riding, David S. Nichols, Anthony B. Shaw, Julien D. Périard
Abstract
This study demonstrates that 10 days of exercise heat acclimation has minimal effects on left ventricular volumes, intrinsic cardiac function, and systemic hemodynamics during prolonged, repeated semirecumbent exercise in moderate heat, where heart rate and blood volume are similar to preacclimation levels. However, progressive dehydration is consistently associated with similar degrees of hyperthermia and tachycardia and reductions in blood volume, diastolic filling of the left ventricle, stroke volume, and cardiac output, regardless of acclimation state.
Topics & Concepts
Stroke volumeVentricleCardiologyCardiac outputInternal medicineHemodynamicsMedicineBlood volumeCardiac function curveAcclimatizationTachycardiaHyperthermiaHeart rateAnesthesiaBlood pressureHeart failureBiologyBotanyThermoregulation and physiological responsesClimate Change and Health ImpactsHeart Rate Variability and Autonomic Control