Short-term studies of heart rate variability: comparison of two methods for recording.

abstract：:In order to detect minute amounts of glucose in diluted urine, we applied the Raman spectroscopy method. To simulate abnormal diluted urine in a toilet bowl, we diluted normal urine ten-fold with water and added glucose up to 8 mg dl(-1). Data were collected using a low-resolution Raman spectrometer that was preproces...

journal_title：Physiological measurement

authors： Park C,Kim K,Choi J,Park K

更新日期：2007-05-01 00:00:00

abstract：:Non-invasive fetal heart rate is of great relevance in clinical practice to monitor fetal health state during pregnancy. To date, however, despite significant advances in the field of electrocardiography, the analysis of abdominal fetal ECG is considered a challenging problem for biomedical and signal processing commu...

journal_title：Physiological measurement

authors： Varanini M,Tartarisco G,Billeci L,Macerata A,Pioggia G,Balocchi R

更新日期：2014-08-01 00:00:00

abstract：:Sleep-wake patterns are often significantly disturbed in critically ill patients. This disturbance is closely linked to secondary brain dysfunctions in these patients. Sedation not only impairs sleep quality in ICU patients but also has detrimental effects on short- and long-term outcome. In other contexts, light ther...

journal_title：Physiological measurement

authors： Weiss B,Spies C,Piazena H,Penzel T,Fietze I,Luetz A

更新日期：2016-09-01 00:00:00

abstract：OBJECTIVE:Brain-computer interfaces (BCIs) are aimed at providing a new way of communication between the human brain and external devices. One of the major tasks associated with the BCI system is to improve classification performance of the motor imagery (MI) signal. Electroencephalogram (EEG) signals are widely used f...

journal_title：Physiological measurement

authors： Su J,Yang Z,Yan W,Sun W

更新日期：2020-08-11 00:00:00

abstract：:Gated SPECT (GSPECT) was evaluated for the measurement of left ventricular ejection fraction (LVEF) by comparing with equilibrium gated radionuclide ventriculography (RNVG). A total of 99 subjects underwent GSPECT and RNVG imaging. All studies were acquired in list mode with GSPECT studies processed to give 16- and 8-...

journal_title：Physiological measurement

authors： Wright GA,McDade M,Keeble W,Martin W,Hutton I

更新日期：2001-05-01 00:00:00

abstract：:We investigated the utility of ICA for evaluation of fetal rhythm in five uncomplicated twin pregnancies and in five twin pregnancies complicated by fetal arrhythmia. Using objective and subjective criteria, we sought to determine how the signal-to-noise ratio, signal fidelity and interference rejection are affected w...

journal_title：Physiological measurement

authors： Mensah-Brown NA,Lutter WJ,Comani S,Strasburger JF,Wakai RT

更新日期：2011-01-01 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

authors： Sezdi M,Bayik M,Ulgen Y

更新日期：2006-07-01 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

authors： Schwenk M,Gogulla S,Englert S,Czempik A,Hauer K

更新日期：2012-11-01 00:00:00

abstract：:Electrical impedance tomography (EIT) image reconstruction is an ill-posed problem requiring maximum measurement precision. Recent EIT systems claim 60 to 80 dB precision. Achieving higher values is hard in practice since measurements must be performed at relatively high frequency, on a living subject, while using com...

journal_title：Physiological measurement

authors： Hartinger AE,Gagnon H,Guardo R

更新日期：2006-05-01 00:00:00

abstract：:The measurement of the complex respiratory impedance at a high temporal resolution is described. The measurement of impedance is correlated with the breathing cycle using electrical transthoracic impedance. This allows the determination of the complex impedance at any fixed point in the respiratory cycle, which result...

journal_title：Physiological measurement

authors： van der Putten WJ,MacLeod D,Prichard JS

更新日期：1993-08-01 00:00:00

abstract：:Agitation is a significant problem in the intensive care unit (ICU), affecting 71% of sedated adult patients during 58% of ICU patient-days (Fraser and Riker 2001 NY Health-Syst. Pharm. 20 17-24). Subjective scale-based assessment methods are currently used to assess the level of patient agitation, but are limited in ...

journal_title：Physiological measurement

authors： Chase JG,Starfinger C,Lam Z,Agogue F,Shaw GM

更新日期：2004-08-01 00:00:00

abstract：:Infant multiple breath washout (MBW) testing serves as a primary outcome in clinical studies. However, it is still unknown whether current software algorithms allow between-centre comparisons. In this study of healthy infants, we quantified MBW measurement errors and tried to improve data quality by simply changing so...

journal_title：Physiological measurement

authors： Anagnostopoulou P,Egger B,Lurà M,Usemann J,Schmidt A,Gorlanova O,Korten I,Roos M,Frey U,Latzin P

更新日期：2016-03-01 00:00:00

abstract：:Muscle stiffness is known to vary as a result of a variety of disease states, yet current clinical methods for quantifying muscle stiffness have limitations including cost and availability. We investigated the capability of shear wave elastography (SWE) to measure variations in gastrocnemius shear wave speed induced v...

journal_title：Physiological measurement

authors： Chernak LA,DeWall RJ,Lee KS,Thelen DG

更新日期：2013-06-01 00:00:00

abstract：:A simple wearable device for sit-to-stand timing detection was designed and constructed with rate gyroscopes and accelerometers and a dedicated adaptive algorithm. The method was validated by comparison with optoelectronic equipment. Results from the comparison showed a maximal error always lower than 2.5 x 10(-2) s f...

journal_title：Physiological measurement

authors： Giansanti D,Maccioni G

更新日期：2006-08-01 00:00:00

abstract：:Electrical impedance tomography (EIT) has the potential to become a new tool for bedside monitoring of regional lung ventilation. The aim of our study was to assess the reproducibility of regional lung ventilation distribution determined by EIT during mechanical ventilation under identical ventilator settings. The exp...

journal_title：Physiological measurement

authors： Frerichs I,Schmitz G,Pulletz S,Schädler D,Zick G,Scholz J,Weiler N

更新日期：2007-07-01 00:00:00

abstract：OBJECTIVE:Accurate bladder size estimation is an important clinical parameter that assists physicians, enabling them to provide better treatment for patients who are suffering from urinary incontinence. Electrical impedance tomography (EIT) is a non-invasive medical imaging method that estimates organ boundaries assumi...

journal_title：Physiological measurement

authors： Konki SK,Khambampati AK,Sharma SK,Kim KY

更新日期：2020-12-18 00:00:00

abstract：:Electrical impedance tomography (EIT) could be used as a portable non-invasive means to image the development of ischaemic stroke or haemorrhage. The purpose of this study was to examine if this was possible using time difference imaging, in the anesthetised rat using 40 spring-loaded scalp electrodes with applied con...

journal_title：Physiological measurement

authors： Dowrick T,Blochet C,Holder D

更新日期：2016-06-01 00:00:00

abstract：:Previous studies demonstrate that it is possible to evaluate a heart graft rejection condition using a bioimpedance technique by means of an intracavitary catheter. We propose to use a less invasive technique consisting in the use of a transoesophageal catheter and two standard ECG electrodes on the thorax. The aim of...

journal_title：Physiological measurement

authors： Giovinazzo G,Ribas N,Cinca J,Rosell-Ferrer J

更新日期：2011-07-01 00:00:00

abstract：:A coordinated study of the dispersal of water between the various body compartments (stomach and gut, blood stream and tissue) and the similar dispersal kinetics of ethanol and its metabolism has been carried out involving two healthy volunteers using flowing afterglow mass spectrometry, FA-MS, and selected ion flow t...

journal_title：Physiological measurement

authors： Spanel P,Wang T,Smith D

更新日期：2005-08-01 00:00:00

abstract：OBJECTIVE:The aim of the study was to explore the feasibility of titrating tidal volume (V T) and positive end-expiratory pressure (PEEP) during one-lung ventilation (OLV) based on ventilation distribution and oxygenation. APPROACH:Twenty-four consecutive patients requiring intubation with a double-lumen tube and subs...

journal_title：Physiological measurement

authors： Zhao Z,Wang W,Zhang Z,Xu M,Frerichs I,Wu J,Moeller K

更新日期：2018-03-29 00:00:00

abstract：:High-frequency (HF) oscillations in RR interval from 0.15-0.40 Hz are widely accepted as a measure of cardiac vagal outflow but the HF/RR relationship appears complex, particularly with longer RR intervals. The aim of this study was to evaluate the HF/RR interval relationship during free and paced breathing. HF power ...

journal_title：Physiological measurement

authors： Sandercock G,Gladwell V,Dawson S,Nunan D,Brodie D,Beneke R

更新日期：2008-07-01 00:00:00

abstract：:A multi-frequency electrical impedance tomography system for cardiopulmonary monitoring has been designed with specialized digital signal processors developed primarily for the telecommunications sector. The system consists of two modules: a scan-head and a base-station. The scan-head, located close to the patient's t...

journal_title：Physiological measurement

authors： Robitaille N,Guardo R,Maurice I,Hartinger AE,Gagnon H

更新日期：2009-06-01 00:00:00

abstract：:Objective assessment of stroke-patients' ability to control arm movements is vital for evidence-based therapy and progress monitoring. This study compares three different indices to quantify the quality of wrist movement during a task involving tracking a target on a screen. Each method is assessed in terms of agreeme...

journal_title：Physiological measurement

authors： Notley SV,Turk R,Pickering R,Simpson DM,Burridge JH

更新日期：2007-08-01 00:00:00

abstract：:Electrical impedance tomography (EIT) has shown significant promise for lung imaging. One key challenge for EIT in this application is the movement of electrodes during breathing, which introduces artefacts in reconstructed images. Various approaches have been proposed to compensate for electrode movement, but no comp...

journal_title：Physiological measurement

authors： Biguri A,Grychtol B,Adler A,Soleimani M

更新日期：2015-06-01 00:00:00

abstract：:In this paper we present the concept, the design and the test procedure for a DSP-based high-precision and high-performance wide-band (up to 10 MHz) bioimpedance analyser module for application in EIT or bioimpedance spectroscopy. The module implements a digital concept with appropriate signal conditioning hardware fo...

journal_title：Physiological measurement

authors： Dudykevych T,Gersing E,Thiel F,Hellige G

更新日期：2001-02-01 00:00:00

abstract：OBJECTIVE:The Actiwatch 2 (AW2) is a wrist-worn accelerometer typically used to measure sleep. Although it can measure physical activity, there is limited evidence supporting its validity. We assessed the validity and reliability of the AW2 to measure sedentary behavior and physical activity (light, moderate, vigorous ...

journal_title：Physiological measurement

authors： Kemp C,Pienaar PR,Henst RHP,Roden LC,Kolbe-Alexander TL,Rae DE

更新日期：2020-09-04 00:00:00

abstract：:Patients with claudication have an inadequate haemodynamic response to exercise. Blood flow response will not only have a magnitude, but also a rate of change. There is scope for investigating these parameters, as manipulation of the factors which control them may benefit work to improve the treatment for claudication...

journal_title：Physiological measurement

authors： Meeson S,Srodon PD

更新日期：2005-12-01 00:00:00

abstract：:Electrical impedance spectroscopy has been developed as a potential method for the diagnosis of carcinoma in epithelial tissues. An understanding of the influence of structural changes in the tissue on the properties measured using this technique is essential for interpreting measured data and optimization of probe de...

journal_title：Physiological measurement

authors： Walker DC,Smallwood RH,Keshtar A,Wilkinson BA,Hamdy FC,Lee JA

更新日期：2005-06-01 00:00:00

abstract：:The aim of the study was to investigate whether body mass index (BMI) influences the estimation of extracellular volume (ECV) in hemodialysis (HD) patients when using segmental bioimpedance analysis (SBIA) compared to wrist-to-ankle bioimpedance analysis (WBIA) during HD with ultrafiltration (UF). Twenty five HD patie...

journal_title：Physiological measurement

authors： Carter M,Morris AT,Zhu F,Zaluska W,Levin NW

更新日期：2005-04-01 00:00:00

abstract：:The heart rate variability is composed of low- and high-frequency fluctuations, which are mediated by the sympathetic and the parasympathetic nervous systems. The baseline and the amplitude of the photoplethysmographic (PPG) signal also show fluctuations in the same frequencies. In the current study, PPG examinations ...

journal_title：Physiological measurement

authors： Nitzan M,Babchenko A,Khanokh B,Landau D

更新日期：1998-02-01 00:00:00