Purpose Autonomic control of the heart is balanced by sympathetic and parasympathetic
inputs. Excitation of both sympathetic and parasympathetic systems occurs concurrently …

The presence of bradycardic arrhythmias during volitional apnea at altitude may be caused
by chemoreflex activation/sensitization. We investigated whether bradyarrhythmic episodes …

Peripheral chemoreflex mediated increases in both parasympathetic and sympathetic drive
under chronic hypoxia may evoke bradyarrhythmias during apneic periods. We determined …

Background Acute exposure to high altitude (> 2500 m) is known to induce a rise in blood
pressure (BP) and the appearance of sleep related breathing alterations, in particular central …

Abstract Hamm, Wolfgang, Lukas von Stülpnagel, Mathias Klemm, Monika Baylacher,
Konstantinos D. Rizas, Axel Bauer, and Stefan Brunner. Deceleration capacity of heart rate …

Sympathoexcitation is a hallmark of hypoxic exposure, occurring acutely, as well as
persisting in acclimatised lowland populations and with generational exposure in highland …

To examine the baroreflex response in humans during and immediately after acute hypoxia
exposure, the cardiac baroreflex sensitivity (BRS) was studied using adaptation of RR …

Objective To assess the influence of different breathing patterns on autonomic
cardiovascular modulation during acute exposure to altitude-induced hypoxia. Design We …

Key points Heart rate is increased in chronic hypoxia and we tested whether this is the result
of increased sympathetic nervous activity, reduced parasympathetic nervous activity, or a …

Elevated heart rate (HR) has been demonstrated in response to acute hypoxia exposure,
which is reportedly due to sympathetic nervous system activation (SNS) and concurrent …