Why the study?
Does 10 days of exercise heat acclimation improve left ventricular volumes, function, and systemic hemodynamics in euhydrated and dehydrated trained humans during exercise in moderate heat?
Does 10 days of exercise heat acclimation improve left ventricular volumes, function, and systemic hemodynamics in euhydrated and dehydrated trained humans during exercise in moderate heat?
Exercise heat acclimation does not significantly alter left ventricular volumes or systemic hemodynamics during submaximal exercise in the heat, whereas dehydration consistently impairs diastolic filling and cardiac output.
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Does not support practice changes for heat-exposed patients; leaves open dehydration's role in limiting LV filling during exercise.
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.
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Travers et al. (2020) studied this question.
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