Validation of a new dielectric device to assess changes of tissue water in skin and subcutaneous fat.


:Easily applicable and inexpensive water-specific techniques to evaluate local oedema, swollen tissue problems and fluid retention in humans are not available. In the present investigation a recently constructed non-invasive device for a local measurement of changes in tissue water in human skin and subcutaneous fat (SSF) was validated. The instrument transmits an ultra high-frequency electromagnetic (EM) wave of 300 MHz into a coaxial line and further into an open-ended coaxial probe which is in contact with the skin. Due to the dimensions of the applied probe the penetration of the EM field extends to subcutaneous fat. A major part of the EM energy is absorbed by tissue water while the rest is reflected back into a coaxial line. From the information of the reflected wave an electrical parameter, directly proportional to tissue water content, called a dielectric constant of SSF, was calculated. For system validation, the decrease of water content in SSF measured with the dielectric technique in the volar forearm of seven patients during haemodialysis treatment was compared with the decrease of the circumference of the forearm and the amount of fluid removed. Statistically highly significant correlations were obtained between the decreasing dielectric constant (i.e. water content) of the SSF and the fluid removed during haemodialysis treatment (r = -0.99, p < 0.01) and between the decreasing dielectric constant and the circumference of the arm (r = 0.97, p < 0.05). The sensitivity of the dielectric method was four-fold compared with the circumferential measurement. The repeatability 3.0% was not dependent on the phase of haemodialysis. The new device allows an easy and non-invasive measurement technique to assess changes of tissue water in SSF.


Physiol Meas


Nuutinen J,Ikäheimo R,Lahtinen T




Has Abstract


2004-04-01 00:00:00












  • Time-related heart autonomic balance characteristics in healthy subjects.

    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 nerv...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Matveev M,Prokopova R,Nachev Ch

    更新日期:2003-08-01 00:00:00

  • Masticatory muscle activity during deliberately performed oral tasks.

    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


    authors: Farella M,Palla S,Erni S,Michelotti A,Gallo LM

    更新日期:2008-12-01 00:00:00

  • In vivo quantification of accumulating abdominal fluid using an electrical impedance tomography hemiarray.

    abstract::A new method to image and quantify intra-abdominal haemorrhage using electrical impedance tomography (EIT) was tested in vivo. Supine peritoneal dialysis patients were monitored using an 8-electrode hemiarray placed on the anterior abdomen. EIT measurements were recorded using the EPack II data acquisition system befo...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Tucker AS,Ross EA,Paugh-Miller J,Sadleir RJ

    更新日期:2011-02-01 00:00:00

  • A bio-telemetric device for measurement of left ventricular pressure-volume loops using the admittance technique in conscious, ambulatory rats.

    abstract::This paper presents the design, construction and testing of a device to measure pressure-volume loops in the left ventricle of conscious, ambulatory rats. Pressure is measured with a standard sensor, but volume is derived from data collected from a tetrapolar electrode catheter using a novel admittance technique. Ther...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Raghavan K,Feldman MD,Porterfield JE,Larson ER,Jenkins JT,Escobedo D,Pearce JA,Valvano JW

    更新日期:2011-06-01 00:00:00

  • Assessment of cerebrospinal fluid outflow conductance using an adaptive observer--experimental and clinical evaluation.

    abstract::Idiopathic normal pressure hydrocephalus (INPH) patients have a disturbance in the dynamics of the cerebrospinal fluid (CSF) system. The outflow conductance, C, of the CSF system has been suggested to be prognostic for positive outcome after treatment with a CSF shunt. All current methods for estimation of C have draw...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Andersson K,Manchester IR,Andersson N,Shiriaev A,Malm J,Eklund A

    更新日期:2007-11-01 00:00:00

  • A clinical distortion index for compressed echocardiogram evaluation: recommendations for Xvid codec.

    abstract::This paper introduces a new clinical distortion index able to measure the decrease in diagnostic content in compressed echocardiograms. It is calculated using cardiologists' answers to a clinical testbed composed of two types of tests: one blind and the other semi-blind. This index may be used to compare clinical perf...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Alesanco A,Hernández C,Portolés A,Ramos L,Aured C,García M,Serrano P,García J

    更新日期:2009-05-01 00:00:00

  • Head and pelvis stride-to-stride oscillations in gait: validation and interpretation of measurements from wearable accelerometers.

    abstract::Unstable gait is a risk factor for falls. Wearable accelerometers enable remote monitoring of daily walking. Here, new methods for measuring stride-to-stride oscillations are validated against optical motion capture, normative data determined, and dependency on walking speed investigated. Walks by 13 young people (mea...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Brodie MA,Beijer TR,Canning CG,Lord SR

    更新日期:2015-05-01 00:00:00

  • Dynamic data monitoring improves predictive analytics for failed extubation in the ICU.

    abstract:OBJECTIVE:Predictive analytics monitoring that informs clinicians of the risk for failed extubation would help minimize both the duration of mechanical ventilation and the risk of emergency re-intubation in ICU patients. We hypothesized that dynamic monitoring of cardiorespiratory data, vital signs, and lab test result...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Keim-Malpass J,Enfield KB,Calland JF,Lake DE,Clark MT

    更新日期:2018-07-16 00:00:00

  • Effects of whole-body mechanical stimulation at double the heart rate on the blood pressure waveform in rats.

    abstract::The effects of mechanical stimulation on hemodynamics, such as due to mechanotransduction in vascular endothelial cells, have been widely discussed recently. We previously proposed a resonance model in which the arterial system is treated as a pressure-transmitting system, and suggested that the application of externa...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Hsiu H,Jan MY,Wang WK,Wang YY

    更新日期:2006-02-01 00:00:00

  • Feasible assessment of recovery and cardiovascular health: accuracy of nocturnal HR and HRV assessed via ring PPG in comparison to medical grade ECG.

    abstract:OBJECTIVE:To validate the accuracy of the Oura ring in the quantification of resting heart rate (HR) and heart rate variability (HRV). BACKGROUND:Wearable devices have become comfortable, lightweight, and technologically advanced for assessing health behavior. As an example, the novel Oura ring integrates daily physic...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Kinnunen H,Rantanen A,Kenttä T,Koskimäki H

    更新日期:2020-05-07 00:00:00

  • Quantifying agitation in sedated ICU patients using heart rate and blood pressure.

    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

    pub_type: 临床试验,杂志文章


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

    更新日期:2004-08-01 00:00:00

  • Is dynamic cerebral autoregulation measurement using transcranial Doppler ultrasound reproducible in the presence of high concentration oxygen and carbon dioxide?

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    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Minhas JS,Syed NF,Haunton VJ,Panerai RB,Robinson TG,Mistri AK

    更新日期:2016-05-01 00:00:00

  • Combining and benchmarking methods of foetal ECG extraction without maternal or scalp electrode data.

    abstract::Despite significant advances in adult clinical electrocardiography (ECG) signal processing techniques and the power of digital processors, the analysis of non-invasive foetal ECG (NI-FECG) is still in its infancy. The Physionet/Computing in Cardiology Challenge 2013 addresses some of these limitations by making a set ...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Behar J,Oster J,Clifford GD

    更新日期:2014-08-01 00:00:00

  • Dynamic profiles of volatile organic compounds in exhaled breath as determined by a coupled PTR-MS/GC-MS study.

    abstract::In this phenomenological study we focus on dynamic measurements of volatile organic compounds (VOCs) in exhaled breath under exercise conditions. An experimental setup efficiently combining breath-by-breath analyses using proton transfer reaction mass spectrometry (PTR-MS) with data reflecting the behaviour of major h...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: King J,Mochalski P,Kupferthaler A,Unterkofler K,Koc H,Filipiak W,Teschl S,Hinterhuber H,Amann A

    更新日期:2010-09-01 00:00:00

  • Wavelet-based real-time calculation of multiple physiological parameters on an embedded platform.

    abstract:OBJECTIVE:This paper aims to present how physiological signals can be processed based on wavelet decomposition to calculate multiple physiological parameters in real-time on an embedded platform. APPROACH:An ECG and PPG are decomposed to the appropriate scale based on a quadratic spline wavelet base in order to obtain...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Tang M,Xia P,He Z,Zhao Z,Chen X,Yang T,Zhang Z,Zhan Q,Li X,Fang Z

    更新日期:2020-03-06 00:00:00

  • The independent components of auditory P300 and CNV evoked potentials derived from single-trial recordings.

    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


    authors: Jervis B,Belal S,Camilleri K,Cassar T,Bigan C,Linden DE,Michalopoulos K,Zervakis M,Besleaga M,Fabri S,Muscat J

    更新日期:2007-08-01 00:00:00

  • Association between RR interval and high-frequency heart rate variability acquired during short-term, resting recordings with free and paced breathing.

    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

    pub_type: 杂志文章


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

    更新日期:2008-07-01 00:00:00

  • A deep neural network for estimating the bladder boundary using electrical impedance tomography.

    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

    pub_type: 杂志文章


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

    更新日期:2020-12-18 00:00:00

  • The contribution of vascular smooth muscle, elastin and collagen on the passive mechanics of porcine carotid arteries.

    abstract::The main components responsible for the mechanical behavior of the arterial wall are collagen, elastin, and smooth muscle cells (SMCs) in the medial layer. We determined the structural and mechanical changes in porcine carotid arteries after administration of Triton® X-100, elastase, and collagenase using the inflatio...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Kochová P,Kuncová J,Svíglerová J,Cimrman R,Miklíková M,Liška V,Tonar Z

    更新日期:2012-08-01 00:00:00

  • Evaluation of an algorithm based on single-condition decision rules for binary classification of 12-lead ambulatory ECG recording quality.

    abstract::A new algorithm for classifying ECG recording quality based on the detection of commonly observed ECG contaminants which often render the ECG unusable for diagnostic purposes was evaluated. Contaminants (baseline drift, flat line, QRS-artefact, spurious spikes, amplitude stepwise changes, noise) were detected on indiv...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Di Marco LY,Duan W,Bojarnejad M,Zheng D,King S,Murray A,Langley P

    更新日期:2012-09-01 00:00:00

  • Comparison of different passive knee extension torque-angle assessments.

    abstract::Previous studies have used isokinetic dynamometry to assess joint torques and angles during passive extension of the knee, often without reporting upon methodological errors and reliability outcomes. In addition, the reliability of the techniques used to measure passive knee extension torque-angle and the extent to wh...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Freitas SR,Vaz JR,Bruno PM,Valamatos MJ,Mil-Homens P

    更新日期:2013-11-01 00:00:00

  • Independent component analysis of normal and abnormal rhythm in twin pregnancies.

    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

    pub_type: 杂志文章


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

    更新日期:2011-01-01 00:00:00

  • The feasibility of in vivo quantification of bone-fluorine in humans by delayed neutron activation analysis: a pilot study.

    abstract::Fluorine (F) plays an important role in dental health and bone formation. Many studies have shown that excess fluoride (F(-)) can result in dental or skeletal fluorosis, while other studies have indicated that a proper dosage of fluoride may have a protective effect on bone fracture incidence. Fluorine is stored almos...

    journal_title:Physiological measurement

    pub_type: 临床试验,杂志文章


    authors: Chamberlain M,Gräfe JL,Byun SH,Chettle DR,Egden LM,Orchard GM,Webber CE,McNeill FE

    更新日期:2012-02-01 00:00:00

  • A practical approach to storage and retrieval of high-frequency physiological signals.

    abstract:OBJECTIVE:Storage of physiological waveform data for retrospective analysis presents significant challenges. Resultant data can be very large, and therefore becomes expensive to store and complicated to manage. Traditional database approaches are not appropriate for large scale storage of physiological waveforms. Our g...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Goodwin AJ,Eytan D,Greer RW,Mazwi M,Thommandram A,Goodfellow SD,Assadi A,Jegatheeswaran A,Laussen PC

    更新日期:2020-04-20 00:00:00

  • The physiological impact of the nonlinearity of arterial elasticity in the ambulatory arterial stiffness index.

    abstract::The ambulatory arterial stiffness index (AASI) is claimed to be a new estimator for arterial rigidity. It was recently defined as one minus the slope of the linear regression of systolic to diastolic ambulatory pressure during 24 h. Although several reports testify its clinical relevance, the explanation of how this n...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Craiem D,Graf S,Salvucci F,Chironi G,Megnien JL,Simon A,Armentano RL

    更新日期:2010-07-01 00:00:00

  • Eye-tracker algorithms to detect saccades during static and dynamic tasks: a structured review.

    abstract:OBJECTIVE:Eye-tracking devices have become widely used as clinical assessment tools in a variety of applied-scientific fields to measure saccadic eye movements. With the emergence of multiple static and dynamic devices, the concurrent need for algorithm development and validation is paramount. APPROACH:This review ass...

    journal_title:Physiological measurement

    pub_type: 杂志文章,评审


    authors: Stuart S,Hickey A,Vitorio R,Welman K,Foo S,Keen D,Godfrey A

    更新日期:2019-02-26 00:00:00

  • A method of reducing the error caused by boundary shape and electrode positions in electrical impedance tomography.

    abstract::This paper describes a method of reducing the influence of the data error caused by non-ideal boundary shape and electrode placement on reconstructed images. A data calibration and a modified Newton-Raphson reconstruction are combined in the method to ensure rapid convergence and small reconstruction error. The method...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Li J

    更新日期:1994-05-01 00:00:00

  • Monitoring nasal conductance by bilateral nasal cannula pressure transducers.

    abstract::Nasal obstruction is common and may disturb well-being during daytime and sleep. Its objective assessment by standard methods requires patient cooperation and inconvenient instrumentation. Therefore, the purpose of this study was to develop a novel, unobtrusive technique for continuous monitoring of changes in nasal c...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Thurnheer R,Bloch KE

    更新日期:2004-04-01 00:00:00

  • A finite element model of needle electrode spatial sensitivity.

    abstract::We used the finite element (FE) method to estimate the spatial sensitivity of a needle electrode for bioimpedance measurements. This current conducting needle with an insulated shaft was inserted in a saline solution and the current was measured at the neutral electrode. Model resistance and reactance were calculated ...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Høyum P,Kalvøy H,Martinsen ØG,Grimnes S

    更新日期:2010-10-01 00:00:00

  • Snore site discrimination using statistical moments of free field snoring sounds recorded during sleep nasendoscopy.

    abstract::The non-invasive measurement of free field snoring sounds to estimate the site of snoring is an important development in the diagnosis, treatment and management of sleep-related breathing disorders. We investigated characteristics of the probability density function by testing the sensitivity of the statistical moment...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Beeton RJ,Wells I,Ebden P,Whittet HB,Clarke J

    更新日期:2007-10-01 00:00:00