Exploring the Efficacy of Several Physiological Synchrony Methods During Collaborative Recall of Stories.

In this study, we assessed the efficacy of various linear and chaotic physiological synchrony methods during collaborative emotive recall of stories, examining how physiological synchronization impacts dyadic interaction in tasks involving emotionally charged narratives. Eighty-two young individuals, forming 41dyads, participated in a task requiring the recall of stories with varying emotional content. We analyzed physiological data using the Lyapunov coefficient, cross-correlation, and coherence indices.

Autonomic and Vascular Responses during Reactive Hyperemia in Healthy Individuals and Patients with Sickle Cell Anemia.

To compare autonomic and vascular responses during reactive hyperemia (RH) between healthy individuals and patients with sickle cell anemia (SCA). Eighteen healthy subjects and 24 SCA patients were subjected to arterial occlusion for 3 min at the lower right limb level. The pulse rate variability (PRV) and pulse wave amplitude were measured through photoplethysmography using the Angiodin PD 3000 device, which was placed on the first finger of the lower right limb 2 min before (Basal) and 2 min after the occlusion.

Rapid adjustments to autonomic control of cardiac rhythm at the onset of isometric exercise in healthy young adults.

Sympathetic nervous system (SNS) and parasympathetic nervous system (PNS) influences on cardiac rhythm at the onset of exercise, a time of rapid autonomic adjustments, are clinically important areas of investigation. Continuous wavelet transform (CWT) involves time-frequency-based heart rate variability (HRV) analysis allowing investigation of autonomic influences on cardiac rhythm during short durations of exercise. Therefore, the purpose of this study was to characterize SNS and PNS influences on cardiac rhythm at the onset of isometric exercise in healthy young adults.

Blood Pressure Prediction Using Ensemble Rules during Isometric Sustained Weight Test.

Background: Predicting beat-to-beat blood pressure has several clinical applications. While most machine learning models focus on accuracy, it is necessary to build models that explain the relationships of hemodynamical parameters with blood pressure without sacrificing accuracy, especially during exercise.

Objective: The aim of this study is to use the RuleFit model to measure the importance, interactions, and relationships among several parameters extracted from photoplethysmography (PPG) and electrocardiography (ECG) signals during a dynamic weight-bearing test (WBT) and to assess the accuracy and interpretability of the model results.

Theil Entropy as a Non-Lineal Analysis for Spectral Inequality of Physiological Oscillations.

Theil entropy is a statistical measure used in economics to quantify income inequalities. However, it can be applied to any data distribution including biological signals. In this work, we applied different spectral methods on heart rate variability signals and cellular calcium oscillations previously to Theil entropy analysis.

Cardiac vagal imbalance to the isometric sustained weight test in adolescents with emotional eating behavior.

Purpose: To assess the relationship between emotional eating behavior and heart rate variability in Spanish adolescents during an isometric exercise test.

Methods: Participants included 52 adolescents aged between 13 and 18 years old. Heart rate was continuously recorded at rest (2 minutes) and during the sustained weight test (2 minutes).

Introduction of Application of Gini Coefficient to Heart Rate Variability Spectrum for Mental Stress Evaluation.

Background: The Gini coefficient is a statistical tool generally used by economists to quantify income inequality. However, it can be applied to any kind of data with unequal distribution, including heart rate variability (HRV).

Objectives: To assess the application of the Gini coefficient to measure inequality in power spectral density of RR intervals, and to use this application as a psychophysiological indicator of mental stress.