Knowledge Tree
heart rate variability
Facts (19)
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Sex differences in cardiorespiratory control under hypoxia - Frontiers frontiersin.org Jan 30, 2025 10 facts
referenceMairer et al. (2013) published a study in the International Journal of Sports Medicine titled 'Effects of exercise and hypoxia on heart rate variability and acute mountain sickness', which explores the interaction between physical exertion, low oxygen, and physiological markers.
procedureSpectral analysis of heart rate variability is performed using Fast Fourier Transform (FFT) with Welch's method and a 50% overlap Hanning window to obtain frequency-domain indexes: total power (TP), low-frequency component (LF, 0.04–0.15 Hz, associated with sympathetic modulation), high-frequency component (HF, 0.15–0.40 Hz, a marker of vagal modulation synchronous with respiration), and the sympatho-vagal (LF/HF) balance.
referenceDeBeck, Petersen, Jones, and Stickland examined the effect of breathing on heart rate variability and muscle sympathetic nerve activity response to acute stress in a 2010 study published in the American Journal of Physiology-Regulatory, Integrative and Comparative Physiology.
claimThe research article 'Sex differences in cardiorespiratory control under hypoxia' focuses on the autonomic nervous system, heart rate variability, hypoxemia, breathing, and sex differences.
referenceBotek et al. (2015) published a study in Autonomic Neuroscience titled 'Heart rate variability and arterial oxygen saturation response during extreme normobaric hypoxia', which analyzes autonomic responses to low oxygen environments.
referenceKrejčí et al. (2018) published a study in Clinical Physiology and Functional Imaging titled 'Dynamics of the heart rate variability and oxygen saturation response to acute normobaric hypoxia within the first 10 min of exposure', which focuses on the immediate physiological response to hypoxia.
referenceA 2016 meta-analysis published in Neuroscience & Biobehavioral Reviews found sex differences in healthy human heart rate variability.
referenceKarinen et al. (2012) published a study in Frontiers in Physiology titled 'Heart rate variability changes at 2400 m altitude predicts acute mountain sickness on further ascent at 3000-4300 m altitudes', which examines heart rate variability as a predictor for mountain sickness.
referenceBuchheit, Richard, Doutreleau, Lonsdorfer-Wolf, Brandenberger, and Simon studied the effect of acute hypoxia on heart rate variability at rest and during exercise in a 2004 paper published in the International Journal of Sports Medicine.
procedureHeart rate variability (HRV) analysis involves analyzing beat-to-beat time series of R-R intervals using a 300-beat time window, focusing on the last 5 minutes for normoxia and iso-time hypoxia conditions.
Extent and Health Consequences of Chronic Sleep Loss and ... - NCBI ncbi.nlm.nih.gov 3 facts
claimChildren with Obstructive Sleep Apnea (OSA) experience changes in blood pressure profiles, heart rate variability, and ventricular wall changes as measured by echocardiography.
claimPeople with Obstructive Sleep Apnea (OSA) exhibit faster heart rates, blunted heart rate variability, and increased blood pressure variability compared to individuals with similar blood pressure but no OSA, all of which are markers of heightened cardiovascular risk.
claimFaster heart rates, blunted heart rate variability, and increased blood pressure variability are markers of heightened cardiovascular risk.
Work environment risk factors causing day-to-day stress in ... link.springer.com Feb 5, 2022 3 facts
claimCo-worker support mediates the daily trajectory of some parameters of heart rate variability.
claimLonger duration of work-related stress results in an increased rise in morning cortisol levels and reduced heart rate variability, while acute stress responses involve elevated blood pressure.
referenceBaethge A, Vahle-Hinz T, and Rigotti T conducted a diary study in 2020 examining the relationship between coworker support and allostasis (heart rate variability) during a workday.
How Testosterone Changes Affect Men's Health as You Age columbiadoctors.org Dec 16, 2025 1 fact
claimWearable devices that monitor heart rate variability, sleep quality, VO2 max, and stress levels can provide objective data to track health progress, but they are not always perfectly accurate and should not replace medical evaluation or personal assessment of how one feels.
Quantum Theory of Consciousness - Scirp.org. scirp.org 1 fact
referenceMcCraty, R. (2017) published 'New Frontiers in Heart Rate Variability and Social Coherence Research: Techniques, Technologies, and Implications for Improving Group Dynamics and Outcomes' in Frontiers in Public Health, volume 5, article number 267.
The New Field of Network Physiology: Building the Human ... frontiersin.org 1 fact
referenceThe study 'The Effects of Specific Respiratory Rates on Heart Rate and Heart Rate Variability' (Appl. psychophysiology biofeedback 28, 13–23) examines how specific respiratory rates influence heart rate and heart rate variability.