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| http://dx.doi.org/10.1183/13993003.00162-2020 | DOI Listing |
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Hemodynamics and vascular oxygenation measured at the forehead during changes in respiration: A SPA-fNIRS study.
Respir Physiol Neurobiol
January 2025
Biomedical Optics Research Laboratory, Department of Neonatology, University Hospital Zurich, University of Zurich, Zurich, Switzerland; Neuroscience Center Zurich, University of Zurich and ETH Zurich, Zurich, Switzerland.
Significance: Cerebral blood flow is influenced by respiration, primarily through changes in the CO concentration of arterial blood.
Aim: The objective of this study was to investigate the effect of changes in arterial CO concentration induced by respiratory changes on oxygenation and hemodynamics in the cerebral and extracerebral tissue layers of the forehead.
Approach: We used systemic physiology augmented functional near-infrared spectroscopy (SPA-fNIRS) to assess changes in forehead hemodynamics and oxygenation as well as systemic physiology in 20 healthy subjects.
Effect of Volitional Modification of Breath Frequency on Attention and Mood States: An Exploratory Randomized Crossover Study.
Int J Yoga
September 2024
Department of Yoga Science, University of Patanjali, Haridwar, Uttarakhand, India.
Article Synopsis
- The study investigated how different breathing frequencies in yoga (high-frequency vs. low-frequency) impact mood, attention, and other mental states.
- Thirty young adults participated, with one group practicing high-frequency breathing and the other low-frequency breathing on different days, while various physiological and psychological measures were recorded.
- Results showed that high-frequency yoga breathing increased alertness and positive mood but raised diastolic blood pressure, while low-frequency breathing improved relaxation and mental calmness, decreasing systolic blood pressure.
The relative contribution of hemodynamic parameters to blood pressure decrease in classical orthostatic hypotension.
J Hypertens
September 2024
Department of Neurology and Clinical Neurophysiology, Leiden University Medical Centre, Leiden.
Purpose: We studied the relative contributions of total peripheral resistance (TPR), stroke volume (SV) and heart rate (HR) to low blood pressure in classical orthostatic hypotension (cOH) on group and individual levels.
Methods: We retrospectively analyzed tilt test records from cOH patients and age/sex-matched controls. We quantified relative effects of HR, SV and TPR on mean arterial pressure (MAP) with the log-ratio method.
Aerobic capacity and respiratory indices of junior cross-country skiers and biathletes during incremental exercise testing.
Sci Rep
September 2024
Department of Teacher Education, NLA University College, Oslo, Norway.
Article Synopsis
- The study analyzed differences in physiological responses during exercise among Turkish National Team biathlon and cross-country ski athletes, focusing on various phases such as isocapnic buffering, hypocapnic hyperventilation, ventilatory threshold, and maximum oxygen uptake.
- It involved 70 athletes (37 male and 33 female) whose body composition was assessed, and their oxygen consumption was measured using portable testing equipment during a treadmill exercise test.
- Results showed that male athletes outperformed female athletes in peak oxygen uptake and speed during critical exercise phases, while cross-country skiers had better performance metrics than biathletes, indicating notable physiological differences by gender and sport type.
Exogenous ketosis attenuates acute mountain sickness and mitigates normobaric high-altitude hypoxemia.
J Appl Physiol (1985)
November 2024
Exercise Physiology Research Group, Department of Movement Sciences, KU Leuven, Leuven, Belgium.
Acute mountain sickness (AMS) represents a considerable issue for individuals sojourning to high altitudes with systemic hypoxemia known to be intimately involved in its development. Based on recent evidence that ketone ester (KE) intake attenuates hypoxemia, we investigated whether exogenous ketosis might mitigate AMS development and identified underlying physiological mechanisms. Fourteen healthy, male participants were enrolled in two 29-h protocols (simulated altitude of 4,000-4,500 m) receiving either KE or a placebo (CON) at regular timepoints throughout the protocol in a randomized, crossover manner.
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