Results 41 to 50 of about 3,634,156 (345)

Spectro-Temporal Electrocardiogram Analysis for Noise-Robust Heart Rate and Heart Rate Variability Measurement

open access: yesIEEE Journal of Translational Engineering in Health and Medicine, 2017
The last few years has seen a proliferation of wearable electrocardiogram (ECG) devices in the market with applications in fitness tracking, patient monitoring, athletic performance assessment, stress and fatigue detection, and biometrics, to name a few.
Diana P. Tobon   +2 more
doaj   +1 more source

Wrist-Based Photoplethysmography Assessment of Heart Rate and Heart Rate Variability: Validation of WHOOP

open access: yesSensors, 2021
Heart rate (HR) and HR variability (HRV) infer readiness to perform exercise in athletic populations. Technological advancements have facilitated HR and HRV quantification via photoplethysmography (PPG).
Clint R. Bellenger   +4 more
doaj   +1 more source

The role of inhibitory G proteins and regulators of G protein signaling in the in vivo control of heart rate and predisposition to cardiac arrhythmias [PDF]

open access: yes, 2012
Inhibitory heterotrimeric G proteins and the control of heart rate. The activation of cell signaling pathways involving inhibitory heterotrimeric G proteins acts to slow the heart rate via modulation of ion channels.
Ang, R, Opel, A, Tinker, A
core   +1 more source

Cardiogenic syncopal states in children and adolescents

open access: yesВопросы современной педиатрии, 2011
The article analyzes modern data on diagnostic approaches in children and adolescents with cardiogenic syncopal status. Clinical symptoms of vasovagal attack and common diagnostic algorithm of episode of syncope in children and adolescents are briefly ...
S.Yu. Tereshchenko
doaj   +2 more sources

Fetal to Neonatal Heart Rate Transition during Normal Vaginal Deliveries: A Prospective Observational Study

open access: yesChildren, 2023
Documentation of fetal to neonatal heart rate (HR) transition is limited. The aim of the current study was to describe HR changes from one hour before to one hour after normal vaginal deliveries.
Yuda Munyaw   +6 more
doaj   +1 more source

Multifractality and scale invariance in human heartbeat dynamics

open access: yes, 2007
Human heart rate is known to display complex fluctuations. Evidence of multifractality in heart rate fluctuations in healthy state has been reported [Ivanov et al., Nature {\bf 399}, 461 (1999)].
A. L. Goldberger   +3 more
core   +1 more source

Effect of selective heart rate slowing in heart failure with preserved ejection fraction [PDF]

open access: yes, 2015
Background Heart failure with preserved ejection fraction (HFpEF) is associated with significant morbidity and mortality but is currently refractory to therapy.
Ashrafian, Houman   +12 more
core   +2 more sources

Heart-Rate Variability—More than Heart Beats?

open access: yesFrontiers in Public Health, 2017
Heart-rate variability (HRV) is frequently introduced as mirroring imbalances within the autonomous nerve system. Many investigations are based on the paradigm that increased sympathetic tone is associated with decreased parasympathetic tone and vice ...
Gernot Ernst
doaj   +1 more source

Heart-rate pulse-shift detector [PDF]

open access: yes, 1974
Detector circuit accurately separates and counts phase-shift pulses over wide range of basic pulse-rate frequency, and also provides reasonable representation of full repetitive EKG waveform.
Anderson, M.
core   +1 more source

Circulating histones as clinical biomarkers in critically ill conditions

open access: yesFEBS Letters, EarlyView.
Circulating histones are emerging as promising biomarkers in critical illness due to their diagnostic, prognostic, and therapeutic potential. Detection methods such as ELISA and mass spectrometry provide reliable approaches for quantifying histone levels in plasma samples.
José Luis García‐Gimenez   +17 more
wiley   +1 more source

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