Scan-associated anxiety (scanxiety): the enigma of emotional breathing oscillations at 0.32 Hz (19 bpm)

Frontiers in Neuroscience, Journal Year: 2024, Volume and Issue: 18

Published: April 4, 2024

MRI-related anxiety in healthy participants is often characterized by a dominant breathing frequency at around 0.32 Hz (19 breaths per minute, bpm) the beginning but few cases also end of scanning. Breathing waves 19 bpm are observed patients with independently scanned body part. In medically intractable epilepsy and intracranial electroencephalography (iEEG), spontaneous through nose varied between 0.24 0.37 (~19 bpm). Remarkable similarity rates during different types states (e.g., epilepsy, cancer, claustrophobia) preferred bpm), which predicted binary hierarchy model Klimesch. This elevated most likely reflects an emotional processing state, energy demands minimized due to harmonic coupling ratio other brain–body oscillations.

Language: Английский

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The contribution of granger causality analysis to our understanding of cardiovascular homeostasis: from cardiovascular and respiratory interactions to central autonomic network control

Frontiers in Network Physiology, Journal Year: 2024, Volume and Issue: 4

Published: Aug. 8, 2024

Homeostatic regulation plays a fundamental role in maintenance of multicellular life. At different scales and biological systems, this principle allows better understanding organization. Consequently, growing interest studying cause-effect relations between physiological systems has emerged, such as the fields cardiovascular cardiorespiratory regulations. For this, mathematical approaches Granger causality (GC) were applied to field physiology last 20 years, overcoming limitations previous offering new perspectives cardiac, vascular respiratory homeostatic interactions. In clinical practice, continuous recording data hospitalized patients or by telemetry opened applicability for these with potential early diagnostic prognostic information. review, we describe theoretical background based on linear GC time frequency domains detect couplings series RR intervals, blood pressure respiration. Interestingly, tools help contribution negative feedback anticipatory feedforward mechanisms controls. We also experimental results tools, consolidating evidence coupling studies. Finally, propose allowing complete interactions well interplay brain high integrative view regulation.

Language: Английский

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Information-Theoretic Analysis of Cardio-Respiratory Interactions in Heart Failure Patients: Effects of Arrhythmias and Cardiac Resynchronization Therapy

Entropy, Journal Year: 2023, Volume and Issue: 25(7), P. 1072 - 1072

Published: July 17, 2023

The properties of cardio-respiratory coupling (CRC) are affected by various pathological conditions related to the cardiovascular and/or respiratory systems. In heart failure, one most common cardiac conditions, degree CRC changes primarily depend on type heart-rhythm alterations. this work, we investigated in heart-failure patients, applying measures from information theory, i.e., Granger Causality (GC), Transfer Entropy (TE) and Cross (CE), quantify directed causality between (RR interval) (Resp) time series. Patients were divided into three groups depending their rhythm (sinus presence low/high number ventricular extrasystoles) studied also after resynchronization therapy (CRT), distinguishing responders non-responders therapy. information-theoretic analysis bidirectional interactions HF patients revealed strong effect nonlinear components RR (high Resp series (respiratory sinus arrhythmia) as well causal interactions. We showed that GC a linear model measure is not sensitive both only free TE CE may them. CRT mainly exhibit unchanged asymmetry values, with statistically significant dominance flow over opposite Resp, before CRT. was Our results indicate success corresponding transfer signal quantified at baseline measurements, which could contribute better selection for

Language: Английский

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Cardiac Autonomic Function and Functional Capacity in Post-COVID-19 Individuals with Systemic Arterial Hypertension

Journal of Personalized Medicine, Journal Year: 2023, Volume and Issue: 13(9), P. 1391 - 1391

Published: Sept. 18, 2023

Individuals diagnosed with systemic arterial hypertension (SAH) are considered risk groups for COVID-19 severity. This study assessed differences in cardiac autonomic function (CAF) and functional capacity (FC) SAH individuals without infection compared to post-COVID-19. Participants comprised 40 aged 31 80 years old, grouped as (G1; n = 21) (G2; 19). CAF was via heart rate variability (HRV), measuring R-R intervals during a 10-min supine period. Four HRV indices were analyzed through symbolic analysis: 0V%, 1V%, 2LV%, 2UV%. FC assessment performed by 6-min walk test (6MWT). G1 G2 showed no significant terms of age, anthropometric parameters, clinical presentation, medication use. exhibited superior 6MWT performance, covering more distance (522 ± 78 vs. 465 59 m, p < 0.05). Specifically, demonstrated moderate positive correlation between the 2LV% index (r 0.58; Shorter walking distances observed However, did not find impaired post-COVID-19 those without. suggests that while impacted FC, remained relatively stable this population.

Language: Английский

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Relationship between Cardio-respiratory Capacity and Academic Performance among Medical Female Ex-Students: Body Mass Index Effect

Salud Ciencia y Tecnología, Journal Year: 2024, Volume and Issue: 5, P. 1110 - 1110

Published: Nov. 7, 2024

Introduction: This study examined the effects of Body Mass Index (BMI) on Cardiorespiratory Capacity (CRC) and explored relationship between CRC Academic Performance (AP) among female medical ex-students at Prince Sattam bin Abdul Aziz University (PSAU). Understanding these associations could highlight role physical fitness in academic success.Methods: A sample 150 ex-students, aged 23.3±0.6 years, was categorized into normal weight (BMI 18.5–24.9 kg/m²) overweight 25–29.9 groups. BMI calculated to determine status, assessed using 20-m shuttle run test (VO2max), AP evaluated through grades (AG) abilities (AA) Spanish Test Educational Abilities. Statistical analyses included independent t-tests Pearson’s correlation.Results: Normal-weight participants demonstrated significantly higher (VO2max = 55.3 ±4.9 mL.kg⁻¹.min⁻¹) than (50.8 ±4.2 mL.kg⁻¹.min⁻¹, p=0.03). Additionally, normal-weight scored both AA (58.82 ±9.7 vs. 59.64 ±10.04, p=0.04) AG (3.4 ±0.6 3.7 ±0.5, p=0.032). negatively correlated with (r -0.20, p=0.024), while positively 0.18, p=0.015) 0.24, p=0.043).Conclusions: Higher associated better performance, increased lower CRC. The findings suggest that promoting may be beneficial for success students PSAU.

Language: Английский

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Future of Sleep Medicine

Sleep Medicine Clinics, Journal Year: 2024, Volume and Issue: 20(1), P. 149 - 164

Published: Nov. 26, 2024

Language: Английский

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Machine Learning Classification of Pediatric Health Status Based on Cardiorespiratory Signals with Causal and Information Domain Features Applied—An Exploratory Study

Journal of Clinical Medicine, Journal Year: 2024, Volume and Issue: 13(23), P. 7353 - 7353

Published: Dec. 2, 2024

This study aimed to evaluate the accuracy of machine learning (ML) techniques in classifying pediatric individuals-cardiological patients, healthy participants, and athletes-based on cardiorespiratory features from short-term static measurements. It also examined impact coupling (CRC)-related (from causal information domains) modeling identify a preferred feature set that could be further explored for specialized tasks, such as monitoring training progress or diagnosing health conditions.

Language: Английский

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Predictive Modeling of Heart Rate from Respiratory Signals at Rest in Young Healthy Humans

Entropy, Journal Year: 2024, Volume and Issue: 26(12), P. 1083 - 1083

Published: Dec. 11, 2024

Biological signals such as respiration (RSP) and heart rate (HR) are oscillatory physiologically coupled, maintaining homeostasis through regulatory mechanisms. This report models the dynamic relationship between RSP HR in 45 healthy volunteers at rest. Cross-correlation was computed, along with regression analysis to predict from its first-order time derivative continuous signals. A simulation model tested possibility of replicating RSP–HR relationship. results showed a lag sub-second range these (849.21 ms ± SD 344.84). The possible modulation by mediated amplitude (in cases). this process allowed us replicate physiological HR. These provide support for understanding interactions cardiorespiratory coupling rest, showing short signal RSP. would optionally be incorporated into resting cardiopulmonary suggests mechanism optimizing alveolar system promoting synchrony gases hemoglobin pulmonary system.

Language: Английский

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Cardio-Respiratory and Muscle Oxygenation Responses to Submaximal and Maximal Exercise in Normobaric Hypoxia: Comparison between Children and Adults

Biology, Journal Year: 2023, Volume and Issue: 12(3), P. 457 - 457

Published: March 16, 2023

As differential physiological responses to hypoxic exercise between adults and children remain poorly understood, we aimed comprehensively characterise cardiorespiratory muscle oxygenation submaximal maximal in normobaric hypoxia the two groups. Following familiarisation, fifteen (Age = 9 ± 1 years) 22 2 completed graded cycling sessions exhaustion a randomized single-blind manner normoxia (NOR; FiO2 20.9) (HYP; 13.0) exercises conditions. Age-specific workload increments were 25 W·3 min-1 for 40 adults. Gas exchange vastus lateralis parameters measured continuously via metabolic cart near-infrared spectroscopy, respectively. Hypoxia provoked significant decreases power output PMAX (children 29%; 16% (F 39.3; p < 0.01)) at gas threshold 10%; adults:18% 8.08; both Comparable changes noted most respiratory similar outputs Children, however, demonstrated, lower PETCO2 throughout test during maintenance of V˙CO2 output. These data indicate that, while acute are comparable adults, there exist age-related select parameters.

Language: Английский

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Maternal cardiorespiratory coupling: differences between pregnant and nonpregnant women are further amplified by sleep-stage stratification

Journal of Applied Physiology, Journal Year: 2023, Volume and Issue: 135(5), P. 1199 - 1212

Published: Sept. 28, 2023

We compare CRC, i.e., the reciprocal interaction between cardiac and respiratory systems, healthy pregnant nonpregnant women for first time. Although CRC is present in both groups, reduced during pregnancy; there less synchronization maternal activity a smaller response heart rate to inhalations exhalations. Stratifying this analysis by sleep stages reveals that differences are most prominent deep sleep.

Language: Английский

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