Results 11 to 20 of about 16,021,980 (396)
Heart rate and respiratory rate influence on heart rate variability repeatability: effects of the correction for the prevailing heart rate [PDF]
Frontiers in Physiology, 2016 Background: Since heart rate variability (HRV) is associated with average heart rate (HR) and respiratory rate (RespRate), alterations in these parameters may impose changes in HRV.
Jakub Sławomir Gąsior +5 more
doaj +3 more sources
Anatomy of the Heart with the Highest Heart Rate [PDF]
Journal of Anatomy, 2021 ABSTRACTShrews occupy the lower extreme of the seven orders of magnitude mammals range in size. Their hearts are large relative to body weight and heart rate can exceed a thousand beats a minute. To investigate whether cardiac traits that are typical mammalian scale to these extremes, we assessed the heart of three species of shrew (genusSorex ...
Yun Hee Chang +2 more
openaire +3 more sources
Circadian rhythm of heart rate and heart rate variability [PDF]
Archives of Disease in Childhood, 2000 Measurements of heart rate variability (HRV) are increasingly used as markers of cardiac autonomic activity.To examine circadian variation in heart rate and HRV in children.A total of 57 healthy infants and children, aged 2 months to 15 years, underwent ambulatory 24 hour Holter recording.
Massin, M. M. +4 more
openaire +2 more sources
Influence of a 100-mile ultramarathon on heart rate and heart rate variability
BMJ Open Sport & Exercise Medicine, 2021 Aims This study aimed to investigate the impact of an ultramarathon (UM) with a distance of 100 miles on heart rate (HR) and heart rate variability (HRV).Methods 28 runners (25 men and 3 women) underwent 24-hour Holter ECG monitoring 1 week before the UM,
Bernd Wolfarth +6 more
doaj +1 more source
Fetal Heart Rate Fragmentation
Frontiers in Pediatrics, 2021 Intrapartum fetal monitoring's primary goal is to avoid adverse perinatal outcomes related to hypoxia/acidosis without increasing unnecessary interventions.
Matilde Costa +6 more
doaj +1 more source
JMIR mHealth and uHealth, 2020 Background Consumer-wearable activity trackers are small electronic devices that record fitness and health-related measures. Objective The purpose of this systematic review was to examine the validity and reliability of commercial wearables in measuring ...
D. Fuller +11 more
semanticscholar +1 more source
Journal of the American Heart Association: Cardiovascular and Cerebrovascular Disease, 2017 BackgroundHeart rate variability (HRV) characterizes cardiac autonomic functioning. The association of HRV with stroke is uncertain. We examined whether 24‐hour HRV added predictive value to the Cardiovascular Health Study clinical stroke risk score (CHS‐
Rohan K. Bodapati +4 more
doaj +1 more source
An Overview of Heart Rate Variability Metrics and Norms
Frontiers in Public Health, 2017 Healthy biological systems exhibit complex patterns of variability that can be described by mathematical chaos. Heart rate variability (HRV) consists of changes in the time intervals between consecutive heartbeats called interbeat intervals (IBIs).
F. Shaffer, J. Ginsberg
semanticscholar +1 more source
Impact of Heart Rate Fragmentation on the Assessment of Heart Rate Variability
Applied Sciences, 2020 Heart rate fragmentation (HRF) is a type of sinoatrial instability characterized by frequent (often every beat) appearance of inflection in the R-R interval time series, despite the electrocardiograms appearing to be sinus rhythm.
Junichiro Hayano +3 more
doaj +1 more source
Investigating sources of inaccuracy in wearable optical heart rate sensors
npj Digital Medicine, 2020 As wearable technologies are being increasingly used for clinical research and healthcare, it is critical to understand their accuracy and determine how measurement errors may affect research conclusions and impact healthcare decision-making. Accuracy of
Brinnae Bent +3 more
semanticscholar +1 more source