Continuous cardiac autonomic and haemodynamic responses to isometric exercise in females
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ORIGINAL ARTICLE
Continuous cardiac autonomic and haemodynamic responses to isometric exercise in females Jamie M. O’Driscoll1 · Claire Boucher1 · Meliz Vilda1 · Katrina A. Taylor1 · Jonathan D. Wiles1 Received: 3 April 2020 / Accepted: 6 October 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Purpose Hypertension is associated with impaired haemodynamic control mechanisms and autonomic dysfunction. Isometric exercise (IE) interventions have been shown to improve autonomic modulation and reduce blood pressure (BP) predominantly in male participants. The physiological responses to IE are unexplored in female populations; therefore, this study investigated the continous cardiac autonomic and haemodynamic response to a single bout of IE in a large female population. Methods Forty physically inactive females performed a single, individually prescribed isometric wall squat training session. Total power spectral density of heart rate variability (HRV) and associated low-frequency (LF) and high-frequency (HF) power spectral components were recorded in absolute ( ms2) and normalised units (nu) pre, during and post an IE session. Heart rate (HR) was recorded via electrocardiography and baroreceptor reflex sensitivity (BRS) via the sequence method. Continuous blood pressure was recorded via the vascular unloading technique and stroke volume via impedance cardiography. Total peripheral resistance (TPR) was calculated according to Ohm’s law. Results During IE, there were significant reductions in HRV (p
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