Clinical Methods and PathophysiologyHemodynamic response to heated water immersion in older individuals with hypertensionMarçal, Isabela R.a; Ngomane, Awassi Y.a; Souza, Fernanda B.a; Ciolac, Emmanuel G.aAuthor Information aDepartment of Physical Education, Exercise and Chronic Disease Research Laboratory – ECDR, School of Sciences, São Paulo State University – UNESP, Bauru, Brazil Received 24 June 2020 Accepted 13 October 2020 Correspondence to Emmanuel Gomes Ciolac, PhD, Faculdade de Ciências, Departamento de Educação Física, Laboratório de Pesquisas em Exercício Físico e Doenças Crônicas, Universidade Estadual Paulista – UNESP, Avenue Engenheiro Luiz Edmundo Carrijo Coube 14-06, Bauru, Brazil, 17033-360, Tel: +55 14 3103 9437; fax: +55 14 3103 6082; e-mail: [email protected]/Twitter: @ProfessorCiolac Blood Pressure Monitoring: June 2021 - Volume 26 - Issue 3 - p 171-175 doi: 10.1097/MBP.0000000000000504 Buy Metrics Abstract The aim of this study was to evaluate blood pressure (BP), heart rate, arterial stiffness and endothelial reactivity responses to heated water immersion in older individuals with hypertension. Thirty-five sedentary individuals (67 ± 5 years) under treatment for hypertension were randomly assigned to water-based [n = 20; 30 min of seated resting in a heated swimming pool (30–32 °C)] or land-based group [n = 15; 30 min of seated resting in a quiet room with controlled temperature (21–23 °C)]. BP, heart rate, arterial stiffness and endothelial reactivity were measured before, immediately after (post) and 45 min after (recovery) each session. Heart rate reduced (P < 0.05) during the land-based session, and the reduction was maintained at post (~7 bpm) and recovery (~9 bpm), but no heart rate changes occurred during and after the water-based session. Systolic/diastolic BP increased (P = <0.001) at post (~29/10 mmHg) and recovery (~10/7 mmHg) in the water-based group, but not in the land-based group. No significant changes in pulse wave velocity and endothelial reactivity occurred in both groups. These results suggest that the hemodynamic response to heated water immersion should be taken into account when assessing the effect of heated water-based exercise on postexercise hypotension in older individuals with hypertension. Copyright © 2020 Wolters Kluwer Health, Inc. All rights reserved.