Abstract:
:Changes of the heart autonomic balance between morning (8-9 h) and afternoon (14-15 h) measurements were studied in 22 healthy subjects. The selection of these two daytime periods was substantiated by the established higher risk of cardiovascular incidents in the morning and the relative balance of the vegetative nervous system in the afternoon hours. The changes were analysed by RR-variability indices from ECG recordings in the resting state and with vegetative nervous system stimulation by the handgrip test and Valsalva manoeuvre. It was shown that there were no significant differences between the morning and afternoon values of the respective indices, between morning and afternoon handgrip tests and between morning and afternoon Valsalva manoeuvres. However, there were significant differences in comparison of the index values between resting state and handgrip test and resting state and Valsalva manoeuvre, both from morning and afternoon measurements. Moreover, the significantly differing indices were clustered in different groupings, when comparing resting state recordings with morning and afternoon stimulation tests. For this reason, the authors introduced an indicator for time-related autonomic balance changes. The indicator evaluates the power of each RR-variability index to respond to changes in the autonomic control, in comparisons between resting state and stimulation data in the morning and afternoon measurements. These evaluations showed low power of the frequency-domain indices to respond to time-related autonomic balance changes in stimulation, with respect to the resting state. The time-domain indices have considerably higher power to react to relative morning and afternoon changes in the two vegetative nervous system components. Based on the estimations of the RR-variability indices obtained by the introduced indicator, a profile was constructed to represent time-related heart autonomic balance changes in healthy subjects. It was established that in spite of the relative stability of the vegetative nervous system in healthy subjects, hypersympatheticotonia and relatively lower parasympathetic tone were present in the risky morning hours.
journal_name
Physiol Measjournal_title
Physiological measurementauthors
Matveev M,Prokopova R,Nachev Chdoi
10.1088/0967-3334/24/3/309subject
Has Abstractpub_date
2003-08-01 00:00:00pages
727-43issue
3eissn
0967-3334issn
1361-6579journal_volume
24pub_type
杂志文章abstract:OBJECTIVE:This paper aims to report on the accuracy of estimating sleep stages using a wrist-worn device that measures movement using a 3D accelerometer and an optical pulse photoplethysmograph (PPG). APPROACH:Overnight recordings were obtained from 60 adult participants wearing these devices on their left and right w...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/1361-6579/aa9047
更新日期:2017-10-31 00:00:00
abstract::In recent AASM practice, parameter actimetry is cited to measure total sleep time in obstructive sleep apnoea patients, when polysomnography is not available. An actigraph was therefore compared to polysomnographic data in 28 subjects with known sleep disordered breathing. Total sleep time (TST), sleep period time (SP...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/31/12/005
更新日期:2010-12-01 00:00:00
abstract:OBJECTIVE:To quantify the presence of cardiorespiratory interaction in a group of 41 healthy subjects performing a subset of the Ewing test battery. APPROACH:We measure the empirical distribution of the cardiorespiratory coupling time (RI), defined as the time from inspiration onset to R peaks in the ECG. The study pr...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/1361-6579/aa9693
更新日期:2017-11-30 00:00:00
abstract::The aim of this study was to analyse the feasibility of long-term measurements of cerebral (crSO2) and peripheral (prSO2) regional tissue oxygen saturation on the first day of life by determining the amount of artefacts and their influence on rSO2. Near infrared spectroscopy (NIRS) measurements were performed fronto-p...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/35/7/1349
更新日期:2014-07-01 00:00:00
abstract:OBJECTIVE:Doppler ultrasound (US) is the most commonly applied method to measure the fetal heart rate (fHR). When the fetal heart is not properly located within the ultrasonic beam, fHR measurements often fail. As a consequence, clinical staff need to reposition the US transducer on the maternal abdomen, which can be a...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/1361-6579/aa8a1a
更新日期:2017-09-21 00:00:00
abstract::During anaesthesia awareness and nociception are serious complications that may further lead to haemodynamic instability. Specific monitoring of depth of hypnosis and depth of analgesia based on heart rate variability (HRV) analysis is eligible to improve patient safety and reduce efforts in post-operative care. Conse...
journal_title:Physiological measurement
pub_type: 临床试验,杂志文章
doi:10.1088/0967-3334/33/2/207
更新日期:2012-02-01 00:00:00
abstract::The aim of this study was to investigate masticatory muscle activity during deliberately performed functional and non-functional oral tasks. Electromyographic (EMG) surface activity was recorded unilaterally from the masseter, anterior temporalis and suprahyoid muscles in 11 subjects (5 men, 6 women; age = 34.6 +/- 10...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/29/12/004
更新日期:2008-12-01 00:00:00
abstract::Measurement of intracranial pressure (ICP) can be invaluable in the management of critically ill patients. Cerebrospinal fluid is produced by the choroid plexus in the brain ventricles (a set of communicating chambers), after which it circulates through the different ventricles and exits into the subarachnoid space ar...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/1361-6579/aa7256
更新日期:2017-07-24 00:00:00
abstract::In magnetic resonance electrical impedance tomography (MREIT) we inject currents through electrodes placed on the surface of a subject and try to reconstruct cross-sectional resistivity (or conductivity) images using internal magnetic flux density as well as boundary voltage measurements. In this paper we present a st...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/24/2/367
更新日期:2003-05-01 00:00:00
abstract:OBJECTIVE:The creation of artificial gravity on board a space station is one of the promising methods for preventing health problems during space missions; a short-radius centrifuge (SRC) is the model of such a method on Earth. Our goal was to evaluate the sensitivity of bioimpedance polysegmental measurements for moni...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/1361-6579/ab840b
更新日期:2020-05-07 00:00:00
abstract::A magnetic pulse generator has been set up in order to study gastric activity. Two coils 1.05 m in diameter, arranged in a Helmholtz configuration, were used. The system generated magnetic field pulses higher than 15 mT, of duration 17.3+/-1.2 ms. Measurements were performed in 11 male volunteers, with average age 29....
journal_title:Physiological measurement
pub_type: 临床试验,杂志文章
doi:10.1088/0967-3334/25/5/015
更新日期:2004-10-01 00:00:00
abstract::Cardiac output (CO) monitoring is not only essential for critically ill patients in the hospital, but also for patients at home and those undergoing cardiopulmonary exercise testing. However, CO is difficult to monitor during daily activities and exercise. In this paper, we aim at developing a novel CO estimation meth...
journal_title:Physiological measurement
pub_type: 临床试验,杂志文章
doi:10.1088/0967-3334/31/5/008
更新日期:2010-05-01 00:00:00
abstract::The back-projected independent components (BICs) of single-trial, auditory P300 and contingent negative variation (CNV) evoked potentials (EPs) were derived using independent component analysis (ICA) and cluster analysis. The method was tested in simulation including a study of the electric dipole equivalents of the s...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/28/8/001
更新日期:2007-08-01 00:00:00
abstract:OBJECTIVE:As the global burden of cardiovascular disease increases, proactive cardiovascular healthcare by means of accurate, precise, continuous, and non-invasive monitoring is becoming crucial. However, no current device is able to provide cardiac hemodynamic monitoring with the aforementioned criterion. Electrical i...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/1361-6579/abb141
更新日期:2020-10-06 00:00:00
abstract::The wrist is increasingly being used as the preferred site for objectively assessing physical activity but the relative accuracy of processing methods for wrist data has not been determined. OBJECTIVE:This study evaluates the validity of four processing methods for wrist-worn ActiGraph (AG) data against energy expend...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/1361-6579/aa6d00
更新日期:2017-06-01 00:00:00
abstract::The goal of the present study was to develop and evaluate a new method for the prediction of unexplained syncope occurrences. Diagnosis of syncope is currently based on the reproduction of symptoms in combination with hypotension and bradycardia induced by a 45 min 60-70 degrees head-upright tilt test (HUTT). The main...
journal_title:Physiological measurement
pub_type: 临床试验,杂志文章
doi:10.1088/0967-3334/28/2/007
更新日期:2007-02-01 00:00:00
abstract::Twenty-nine patients were monitored overnight for breathing distress patterns during postoperative analgesia. Nasal flow apnoea monitoring and pulse oximetry data were recorded at 50 Hz. Respiratory inductive plethysmography (RIP) tracked tidal volume (TV) thoracoabdominal motion, and supplemented the flow monitoring ...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/20/2/307
更新日期:1999-05-01 00:00:00
abstract::False alarm (FA) rates as high as 86% have been reported in intensive care unit monitors. High FA rates decrease quality of care by slowing staff response times while increasing patient burdens and stresses. In this study, we proposed a rule-based and multi-channel information fusion method for accurately classifying ...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/37/8/1298
更新日期:2016-08-01 00:00:00
abstract::A photoplethysmographic (PPG) signal can provide very useful information about a subject's cardiovascular status. Motion artifacts (MAs), which usually deteriorate the waveform of a PPG signal, severely obstruct its applications in the clinical diagnosis and healthcare area. To reduce the MAs from a PPG signal, in the...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/36/10/2159
更新日期:2015-10-01 00:00:00
abstract::This study investigates the cerebral hemodynamic changes during a routine sleep-deprived video-electroencephalogram (SD-VEEG) in healthy children. Forty-two children with normal intelligence were examined. The children were 5-14 years of age, and their electroencephalograms (EEGs) were within the normal range. Each su...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/37/7/981
更新日期:2016-07-01 00:00:00
abstract::Chemical alterations of red blood cells (RBCs) during storage eventually affect the electrical properties of blood. In this study, the physiological parameters such as extracellular (SAGM + CPD + residual plasma) Na(+), K(+), Cl(-), pH, 2,3-DPG and ATP together with the Cole-Cole parameters were measured using erythro...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/27/7/006
更新日期:2006-07-01 00:00:00
abstract::We aim to investigate whether phase shift between respiratory oscillations in cerebral blood flow velocity (CBFV) and arterial blood pressure (ABP) is associated with changes in cerebral autoregulation (CA) or reflects the mechano-elastic properties of the cerebrovascular bed. The relationships between respiratory pha...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/1361-6579/38/2/310
更新日期:2017-02-01 00:00:00
abstract:OBJECTIVE:The healing of wounds is critical in protecting the human body against environmental factors. The mechanisms involving protein expression during this complex physiological process have not been fully elucidated. APPROACH:Here, we use reverse-phase protein microarrays (RPPA) involving 94 phosphoproteins to st...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/1361-6579/aaee19
更新日期:2018-12-07 00:00:00
abstract::Body temperature measurement is an important clinical parameter. The performance of a number of non-invasive thermometers was measured by comparing intra- and inter-operator variability (n = 100) and clinical accuracy (n = 61). Variability was elevated in febrile compared to normothermic subjects for axillary and oral...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/31/9/003
更新日期:2010-09-01 00:00:00
abstract::Vital signs monitoring is ubiquitous in clinical environments and emerging in home-based healthcare applications. Still, since current monitoring methods require uncomfortable sensors, respiration rate remains the least measured vital sign. In this paper, we propose a video-based respiration monitoring method that aut...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/37/1/100
更新日期:2016-01-01 00:00:00
abstract::A majority of geriatric patients experience difficulty in performing sit-to-stand (SiSt) transitions. A detailed assessment of SiSt ability is a prerequisite for successful rehabilitation. Body fixed sensors (BFSs) are increasingly used to assess functional performances. As to date there is no system which analyzes cl...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/33/11/1931
更新日期:2012-11-01 00:00:00
abstract::Heart rate variability (HRV) is often analysed using short-term studies. Our objective was to compare two of them in a group of diabetic patients (reduced HRV) and in a control group. From the same 10 min surface electrocardiogram (ECG) two recordings were obtained. In one of them the whole signal was acquired through...
journal_title:Physiological measurement
pub_type: 临床试验,杂志文章
doi:10.1088/0967-3334/25/6/n01
更新日期:2004-12-01 00:00:00
abstract::If electrical impedance tomography is to be used as a clinical tool, the image reconstruction algorithms must yield accurate images of impedance changes. One of the keys to producing an accurate reconstructed image is the inclusion of prior information regarding the physical geometry of the object. To achieve this, ma...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/22/1/308
更新日期:2001-02-01 00:00:00
abstract::Controversial data exist on acute and chronic effects of competitive sports on central hemodynamics and arterial stiffness. We investigated chronic as well as acute training effects in professional rowers. The trial was planned as a non-randomized, controlled pilot-study comparing athletes and controls. 13 German nati...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/37/4/544
更新日期:2016-04-01 00:00:00
abstract::We tested the hypothesis that transmission of arterial pressure to brain tissue oxygenation is low under conditions of arterial pressure instability. Two experimental models of hemodynamic instability were used in healthy human volunteers; (1) oscillatory lower body negative pressure (OLBNP) (N = 8; 5 male, 3 female),...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/36/4/785
更新日期:2015-04-01 00:00:00