Now showing items 1-20 of 28

    • A comparison of heartbeat detectors for the seismocardiogram 

      García González, Miguel Ángel; Argelagós Palou, Ariadna; Fernández Chimeno, Mireya; Ramos Castro, Juan José (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Conference lecture
      Open Access
      The study aimed to study the accuracy in RR time series derived from the seismocardiogram when employing different heartbeat detectors in subjects measured in a quiet environment. The ECG and seismocardiogram of 17 healthy ...
    • A methodology to quantify the differences between alternative methods of heart rate variability measurement 

      García González, Miguel Ángel; Fernández Chimeno, Mireya; Guede Fernández, Federico; Ferrer Mileo, Víctor; Argelagós Palou, Ariadna; Álvarez Gómez, Laura; Parrado Romero, Eva; Moreno Sánchez, Jordi; Capdevila, Lluis; Ramos Castro, Juan José (Institute of Physics (IOP), 2015-12-14)
      Article
      Open Access
      This work proposes a systematic procedure to report the differences between heart rate variability time series obtained from alternative measurements reporting the spread and mean of the differences as well as the agreement ...
    • A novel index based on fractional calculus to assess the dynamics of heart rate variability: changes due to chi or yoga meditations 

      García González, Miguel Ángel; Ramos Castro, Juan José; Fernández Chimeno, Mireya (Computing in Cardiology, 2012)
      Conference lecture
      Restricted access - publisher's policy
      The study aims to present and interpret a novel index based on fractional calculus ( αc) and to assess differences in RR time series dynamics in subjects during meditation. Fractional differintegration (FDI) of a RR time ...
    • A photoplethysmography smartphone-based method for heart rate variability assessment: device model and breathing influences 

      Guede Fernández, Federico; Ferrer Mileo, Víctor; Mateu Mateus, Marc; Ramos Castro, Juan José; García González, Miguel Ángel; Fernández Chimeno, Mireya (2020-03)
      Article
      Open Access
      A measurement method of heart rate and heart rate variability (HRV) based on smartphone has been developed and validated. The method is based on photoplethysmography (PPG) acquired with the smartphone camera (SPPG). SPPG ...
    • An application of fractional differintegration to heart rate variability time series 

      García González, Miguel Ángel; Fernández Chimeno, Mireya; Ramos Castro, Juan José; Capdevila, Lluis; Parrado, Eva (2013-07)
      Article
      Restricted access - publisher's policy
      Fractional differintegration is used as a new tool to characterize heart rate variability time series. This paper proposes and focuses in two indexes (ac and fnQ) derived from the fractional differintegration operator. ...
    • Assessment of heart rate variability during an endurance mountain trail race by multi-scale entropy analysis 

      Vallverdú Ferrer, Montserrat; Ruiz Muñoz, Aroa; Roca Rodríguez, Emma; Caminal Magrans, Pere; Rodríguez Guisado, Ferran Agustin; Irurtia Amigo, Alfredo; Perera Lluna, Alexandre (2017-12-01)
      Article
      Open Access
      © 2017 by the authors. The aim of the study was to analyze heart rate variability (HRV) response to high-intensity exercise during a 35-km mountain trail race and to ascertain whether fitness level could influence autonomic ...
    • Assessment of heart rate variability during an ultra-endurance mountain trail race by multi-scale entropy analysis 

      Vallverdú Ferrer, Montserrat; Ruiz Muñoz, Aroa; Roca Rodríguez, Emma; Caminal Magrans, Pere; Rodríguez Guisado, Ferran Agustin; Irurtia Amigo, Alfredo; Perera Lluna, Alexandre (2017-12-01)
      Article
      Open Access
      The aim of the study was to analyze heart rate variability (HRV) response to high-intensity exercise during a 35-km mountain trail race and to ascertain whether fitness level could influence autonomic nervous system (ANS) ...
    • Calcium Alternans is Due to an Order-Disorder Phase Transition in Cardiac Cells 

      Álvarez Lacalle, Enrique; Echebarría Domínguez, Blas; Spalding, Jon; Shiferaw, Yohannes (2015-03-12)
      Article
      Open Access
      Electromechanical alternans is a beat-to-beat alternation in the strength of contraction of a cardiac cell, which can be caused by an instability of calcium cycling. Using a distributed model of subcellular calcium we show ...
    • Cardiac tissue engineering by electrical stimulation with subcutaneous and cardiac adipose-tissue derived progenitor cells (ATDPCs) 

      Bayés-Genís, Antoni; Llucià-Valldeperas, Aida; Sánchez Terrones, Benjamín; Soler-Botija, C.; Roura, S.; Prat-Vidal, C.; Gálvez-Montón, C.; Rosell Ferrer, Francisco Javier; Bragós Bardia, Ramon (Fundació 'La Caixa', 2011)
      Other
      Restricted access - publisher's policy
      A major challenge of cardiac tissue engineering is directing cells to establish the physiological structure and function of the myocardium being replaced. In native heart, pacing cells generate electrical stimuli that ...
    • Changes in heart rate variability (HRV) in field hockey players during the 2006 World Cup 

      Rodas Font, Gil; Yanguas Leyes, Javier; Pedret, Carles; Ramos Castro, Juan José; Capdevila, L. (2011-07)
      Article
      Open Access
      The aim of this study is to determine the changes in heart rate variability (HRV) in field hockey players during the course of a world championship. The Spanish national team took part in the study by making daily records ...
    • Changes in heart rate variability indexes due to drowsiness in professional drivers measured in a real environment 

      García González, Miguel Ángel; Fernández Chimeno, Mireya; Ramos Castro, Juan José (Computing in Cardiology, 2012)
      Conference lecture
      Restricted access - publisher's policy
      The study aims to assess the changes in Heart Rate Variability (HRV) indexes in healthy subjects whi le driving in a real environment in order to detect drowsiness. The ECG of ten professional drivers was acquired ...
    • Characterization of HRV and QRS slope during audiovisual stimulation 

      Arcentales, Andrés; Raza, Melissa; Giraldo Giraldo, Beatriz (2017)
      Conference report
      Restricted access - publisher's policy
      Emotions are directly related whit external or internal stimulation which a person is submitted, influencing these stimuli on their physical and mental health. These emotional changes produce variations in cardiovascular ...
    • Comparison of two cardiac output monitors, qCO and LiDCO, during general anesthesia 

      Escrivá, Jesús; Gabarrón, Eva; Fort, Pol; Pan, Y.; Shengjin, Ge; Liao, Q; Vallverdú Ferrer, Montserrat (2016-08-09)
      Article
      Open Access
      Background: Optimization of cardiac output (CO) has been evidenced to reduce postoperative complications and to expedite the recovery. Likewise, CO and other dynamic cardiac parameters can describe the systemic blood flow ...
    • Deformable mesh model for cardiac motion estimation from MRI data 

      González Paredes, Alex (Universitat Politècnica de Catalunya, 2009)
      Master thesis (pre-Bologna period)
      Open Access
      The use of technology in medical applications has expanded tremendously in the last 50 years, playing an important role in diagnosis and treatment of disease. As a consequence of this growth, it has been possible to develop ...
    • Do ventricular repolarization interval ratios depend on heart rate and should they be rate-corrected? 

      Alvarado Serrano, Carlos; Ramos Castro, Juan José; Pallàs-Areny, Ramon (Institute of Electrical and Electronics Engineers, 2003-09)
      Conference report
      Open Access
      QT interval decreases with increasing heart rate (HR), hence to define normal values of QT interval for different heart rates requires the application of a QT interval rate correction formula. However, the influence of HR ...
    • Estudi de la repercussió de cardiopaties congènites en la capacitat de bombeig del cor 

      Ferraté Domingo, Elisenda (Universitat Politècnica de Catalunya, 2015-06)
      Bachelor thesis
      Open Access
      En l’actualitat, el nombre d’investigacions i de projectes realitzats amb la col·laboració de diverses disciplines de la ciència i la tecnologia és més elevat. Per tal de trobar equacions o lleis genèriques que permetin ...
    • Global and transient effects of intermittent hypoxia on heart rate variability markers: evaluation using an obstructive sleep apnea model 

      Romero, Daniel; Jané Campos, Raimon (Institute of Electrical and Electronics Engineers (IEEE), 2021-01-01)
      Article
      Open Access
      Intermittent hypoxia (IH) produces autonomic dysfunction that promotes the development of arrhythmia and hypertension in patients with obstructive sleep apnea (OSA). This paper investigated different heart rate variability ...
    • HRV based Health&Sport markers using video from the face 

      Capdevila, Ll.; Moreno, Jordi; Movellan, Javier; Parrado Romero, Eva; Ramos Castro, Juan José (IEEE, 2012)
      Conference report
      Restricted access - publisher's policy
      Heart Rate Variability (HRV) is an indicator of health status in the general population and of adaptatio n to stress in athletes. In this paper we compare the performance of two systems to measure HRV: (1) A commerc ...
    • Human emotion characterization by heart rate variability analysis guided by respiration 

      Valderas Yamuza, Maria Teresa; Bolea, Juan; Orini, M; Laguna Lasaosa, Pablo; Vallverdú Ferrer, Montserrat; Bailón Luesma, Raquel (2019-01-28)
      Article
      Open Access
      Developing a tool which identifies emotions based on their effect on cardiac activity may have a potential impact on clinical practice, since it may help in the diagnosing of psycho-neural illnesses. In this study, a method ...
    • Non-linear HRV analysis to quantify the effects of intermittent hypoxia using an OSA rat model 

      Romero, Daniel; Jané Campos, Raimon (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Conference report
      Open Access
      In this paper, a non-linear HRV analysis was performed to assess fragmentation signatures observed in heartbeat time series after intermittent hypoxia (IH). Three markers quantifying short-term fragmentation levels, PIP, ...