Deriving heart rate variability indices from cardiac monitoring-An indicator of driver sleepiness.

CONCLUSIONS: The association of HRV indices to KSS did not depend on the preprocessing strategy. No preprocessing method showed superiority for HRV association to driver sleepiness. This was also true for combinations of methods for frequency domain HRV indices. The results prove clear relationships between HRV indices and perceived sleepiness. Thus, HRV analysis shows promise for driver sleepiness detection. PMID: 30978124 [PubMed - as supplied by publisher]
Source: Traffic Injury Prevention - Category: Accident Prevention Authors: Tags: Traffic Inj Prev Source Type: research

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AbstractObjectiveThe aim of this study was to demonstrate the temporal profile of changes in heart rate variability (HRV), blood pressure variability (BPV), and cardiac baroreflex sensitivity (BRS) during the course of a healthy pregnancy.Materials and methodsThis was a longitudinal study during which autonomic variability parameters (HRV, BPV, BRS) were assessed in 66 pregnant women at 11 –13, 20–22 and 30–32 weeks of gestation. A lead II electrocardiogram tracing and beat-to-beat blood pressure were recorded with the subject breathing spontaneously in the supine position. Changes in the parameters ...
Source: Clinical Autonomic Research - Category: Research Source Type: research
The human and dog have sinus arrhythmia; however, the beat-to-beat interval changes were hypothesized to be different. Geometric analyses (R–R interval tachograms, dynamic Poincaré plots) to examine rate changes on a beat-to-beat basis were analyzed along with time and frequency domain heart rate variability from 40 human and 130 canine 24-h electrocardiographic recordings. Humans had bell-shaped beat-interval distributions, narrow interval bands across time with continuous interval change and linear changes in rate. In contrast, dogs had skewed non-singular beat distributions, wide interval bands {despite fas...
Source: Frontiers in Physiology - Category: Physiology Source Type: research
The human and dog have sinus arrhythmia; however, the beat-to-beat interval changes were hypothesized to be different. Geometric analyses (R-R interval tachograms, dynamic Poincaré plots) to examine rate changes on a beat-to-beat basis were analyzed along with time and frequency domain heart rate variability from 40 human and 130 canine 24-hour electrocardiographic recordings. Humans had bell-shaped beat-interval distributions, narrow interval bands across time with continuous interval change and linear changes in rate. In contrast, dogs had skewed nonsingular beat distributions, wide interval bands {despite faster ...
Source: Frontiers in Physiology - Category: Physiology Source Type: research
AbstractBackgroundEarly dumping and post-bariatric hypoglycemia (PBH) are often addressed as two separate postprandial complications after Roux-en-Y gastric bypass (RYGB). The aim of the study was to evaluate the occurrence of early dumping in RYGB-operated individuals with PBH with and without treatment intervention.MethodsEleven RYGB-operated women with documented PBH each underwent a baseline liquid mixed meal test (MMT) followed by five MMTs preceded by treatment with: acarbose 50  mg for 1 week, sitagliptin 100 mg for 1 week, verapamil 120 mg for 1 week, liraglutide 1.2 mg for 3 ...
Source: Obesity Surgery - Category: Surgery Source Type: research
This study explored whether sympathovagal modulation assessed through frequency domains of heart rate variability (HRV) can indicate sepsis in patients with suspected infection. In total, 370 consecutive adult patients with suspected infection admitted to the emergency department were enrolled in this single-center cohort study. A continuous 10-minute electrocardiography for HRV analysis was recorded immediately for these patients after inclusion. Patients were stratified into non-sepsis and sepsis groups based on a sepsis-related organ failure assessment score of ≥2 that met the Third International Consensus Definitio...
Source: Medicine - Category: Internal Medicine Tags: Research Article: Observational Study Source Type: research
This study was designed to determine the effectiveness of continuous positive airway pressure (CPAP) treatment on the improvement of heart rate variability (HRV) and whether gender plays a role in HRV in patients with mode-rate to severe obstructive sleep apnea syndrome (OSAS). METHODS: Consecutive patients with recently diagnosed moderate to severe OSAS underwent continuous synchronized electrocardiographic monitoring and were prospectively considered for inclusion in the study. HRV was analyzed before starting CPAP therapy and 1 year thereafter. The effects of CPAP on HRV were evaluated in men and women separately t...
Source: Turk Kardiyoloji Dernegi arsivi - Category: Cardiology Authors: Tags: Turk Kardiyol Dern Ars Source Type: research
In conclusion, long-term exposure to microgravity conditions leads to elevated low-frequency oscillations of ventricular repolarization, which are potentiated following sympathetic stimulation and are related to increased risk for repolarization instabilities and arrhythmias. Tested countermeasures are only partially effective in counteracting microgravity effects.
Source: Frontiers in Physiology - Category: Physiology Source Type: research
Conclusions: A screening tool based on heart rate variability and anthropometric parameters was developed to identify subjects with higher probability of suffering or developing cardio metabolic risk factors. PMID: 31829032 [PubMed - as supplied by publisher]
Source: Blood Pressure - Category: Hematology Tags: Blood Press Source Type: research
This study tests the utility of the concomitant evaluation of RR variability (RRV) and QT variability (QTV) markers in typifying cardiac autonomic control of humans under different experimental conditions and of rat groups featuring documented differences in resting sympatho-vagal balance. We considered: (i) 23 healthy young subjects in resting supine position (REST) undergoing head-up tilt at 45° (T45) and 90° (T90) followed by recovery to the supine position; (ii) 9 Wistar (WI) and 14 wild-type Groningen (WT) rats in unstressed conditions, where the WT animals were classified as non-aggressive (non-AGG, n = 9) an...
Source: Frontiers in Physiology - Category: Physiology Source Type: research
CHICAGO (AP) — Two centuries after its invention, the stethoscope — the very symbol of the medical profession — is facing an uncertain prognosis. It is threatened by hand-held devices that are also pressed against the chest but rely on ultrasound technology, artificial intelligence and smartphone apps instead of doctors’ ears to help detect leaks, murmurs, abnormal rhythms and other problems in the heart, lungs and elsewhere. Some of these instruments can yield images of the beating heart or create electrocardiogram graphs. Dr. Eric Topol, a world-renowned cardiologist, considers the stethoscope obs...
Source: TIME: Health - Category: Consumer Health News Authors: Tags: Uncategorized technology Source Type: news
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