Abstract:
:This article compares the determination of body fat-free-mass (FFM) by impedance, using either hand-to-foot resistance (R₁₃) or foot-to-foot one (R₃₄) from comparison with dual X-ray absorptiometry (DXA) measurements in a normal population. The first goal was to see if the foot-to-foot resistance used in body fat analysers provides less accurate information for body FFM than the hand-to-foot one used by medical impedance-meters. Another goal was to compare the prediction accuracy of six different regression equations of FFM for each sex and for each resistance relatively to DXA. The impedancemeter used in this study was a Tefal prototype with 4 plantar electrodes and 4 additional electrodes for the hands and providing hand-to-foot and foot-to-foot resistances. Coefficients of these correlations were determined by comparison with FFM measured by DXA in a 1st cohort of 170 healthy adults. For an independent validation, these equations were tested in a 2nd cohort of 86 adults who underwent the same impedance and DXA protocols, using Student's paired t-tests. The accuracy of FFM prediction increased generally with the number of physiologic parameters included in the regression, but none of our equations gave FFM predictions significantly different from DXA. FFM calculated from the foot-to-foot resistance were closer to DXA values than those calculated from hand-to-foot resistance, as their average P-value of comparison with DXA was higher at 0.695 against 0.387 for R₁₃.
journal_name
Med Biol Eng Computjournal_title
Medical & biological engineering & computingauthors
Bousbiat S,Jaffrin MY,Dongmo Edoi
10.1007/s11517-011-0827-ysubject
Has Abstractpub_date
2011-11-01 00:00:00pages
1329-36issue
11eissn
0140-0118issn
1741-0444journal_volume
49pub_type
杂志文章abstract::It is acknowledged that the first heart sound S1 consists of two major, high-frequency components M1 and T1, corresponding, respectively, to the vibrations of the mitral and tricuspid valves and their surrounding tissues following valve closure in early systole. In this study, the matching pursuit (MP) method was used...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/BF02345436
更新日期:2001-11-01 00:00:00
abstract::The clinical efficacy of a microwave (MW) hyperthermia system using an electric-field converging (lens) applicator is evaluated for 42 malignant tumours with a maximum tumour depth of less than 7 cm. The mean of the maximum, average and minimum tumour temperature of the 42 tumours are 44.5, 42.5 and 40.7 C, respective...
journal_title:Medical & biological engineering & computing
pub_type: 临床试验,杂志文章
doi:10.1007/BF02522944
更新日期:1995-01-01 00:00:00
abstract::A continuous cardiac output monitoring system has been developed in the laboratory to allow the real-time measurement of the cardiac output. This form of continuous cardiac output measurement allows the doctor to view the beat-to-beat cardiac output and can be employed to measure artery constrictions as well. The sens...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/BF02345272
更新日期:2001-01-01 00:00:00
abstract::This study introduced the Kalman filter procedure for tracking urinary bladder filling from intermittent bladder volume measurements taken by an ultrasonic bladder volume monitor. The Kalman filter was based on a double integrator as a model for the bladder filling process between micturitions and included a procedure...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/BF02345809
更新日期:2005-05-01 00:00:00
abstract::Currently, simulations of the induced currents in the brain produced by transcranial magnetic stimulation (TMS) are used to elucidate the regions reached by stimuli. However, models commonly found in the literature are too general and neglect imperfections in the windings. Aiming to predict the stimulation sites in pa...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-020-02156-2
更新日期:2020-07-01 00:00:00
abstract::Fetal heart rate (FHR) monitoring is used routinely in labor, but conventional methods have a limited capacity to detect fetal hypoxia/acidosis. An exploratory study was performed on the simultaneous assessment of maternal heart rate (MHR) and FHR variability, to evaluate their evolution during labor and their capacit...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-015-1359-7
更新日期:2016-04-01 00:00:00
abstract::The relation is investigated between stimulus frequency, stimulus pulse amplitude and the neural damage induced by continuous stimulation of the cat's sciatic nerve. The chronically implanted electrodes were pulsed continuously and the effects of the electrical stimulation were quantified as the amount of early axonal...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/BF02510526
更新日期:1995-05-01 00:00:00
abstract::Magnetic nanoparticles for therapy and diagnosis are at the leading edge of the rapidly developing field of bionanotechnology. In this study, we have theoretically studied motion of magnetic nano- as well as micro-particles in the field of cylindrical Halbach array of permanent magnets. Magnetic flux density was model...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-010-0636-8
更新日期:2010-08-01 00:00:00
abstract::Musculoskeletal models have been developed to estimate internal loading on the human skeleton, which cannot directly be measured in vivo, from external measurements like kinematics and external forces. Such models of the shoulder and upper extremity have been used for a variety of purposes, ranging from understanding ...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章,评审
doi:10.1007/s11517-013-1099-5
更新日期:2013-09-01 00:00:00
abstract::Apoptosis proteins are related to many diseases. Obtaining the subcellular localization information of apoptosis proteins is helpful to understand the mechanism of diseases and to develop new drugs. At present, the researchers mainly focus on the primary protein sequences, so there is still room for improvement in the...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-019-02045-3
更新日期:2019-12-01 00:00:00
abstract::Respiratory sinus arrhythmia (RSA) is the variation of heart rate (or RR interval) in phase with respiration and has been extensively studied. However, the effect of respiration on atrioventricular conduction delay (and hence PR interval length) has not yet received much attention. This work reports on measurements of...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/BF02345298
更新日期:2002-11-01 00:00:00
abstract::A bicuspid aortic valve (BAV) is a congenital cardiac disorder where the valve consists of only two cusps instead of three, as in a normal tricuspid valve (TAV). Although 97 % of BAVs include asymmetric cusps, little or no prior studies have investigated the blood flow through a three-dimensional BAV and root. The aim...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-013-1055-4
更新日期:2013-08-01 00:00:00
abstract::In the case of female breast cancer, a breast-conserving excision is often desirable. This surgery is based on preoperatively gathered MRI, mammography, and sonography images. These images are recorded in multiple patient positions, e. g., 2D mammography images in standing position with a compressed breast and 3D MRI ...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-019-01977-0
更新日期:2019-07-01 00:00:00
abstract::In common radiography, image contrast is often limited due mainly to scattered x-rays and noise, decreasing the quantitative usefulness of x-ray images. Several scatter reduction methods based on software correction schemes have been extensively investigated in an attempt to overcome these difficulties, most of which ...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-018-1893-1
更新日期:2019-02-01 00:00:00
abstract::In acute experiments the sciatic nerve of the rat is electrically stimulated to induce fatigue in the medial Gastrocnemius muscle. Fatigue tests are carried out using intermittent stimulation of different compartments (sequential) or a single compartment (synchronous) of the sciatic nerve. The activation of different ...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/BF02530036
更新日期:1997-05-01 00:00:00
abstract::A method for the estimation of medium rate transitions of non-stationary electroencephalograms (EEG) is proposed. The method is applicable to such EEG dynamics that are between (a) fast transitions for which segmentation procedures are used and (b) slow transitions for which adaptive filters work properly. The estimat...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/BF02513305
更新日期:1999-05-01 00:00:00
abstract::Atrial fibrillation (AF) is the most common cardiac arrhythmia with episodes that may terminate spontaneously in the first stages of the disease. On the other hand, when the arrhythmia is not self-terminating, normal sinus rhythm (NSR) restoration use to be required to reduce the risk of stroke and improve cardiac out...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-008-0348-5
更新日期:2008-07-01 00:00:00
abstract::In a previous paper we demonstrated that the linear portion of the pressure-velocity loop (PU-loop) corresponding to early systole could be used to calculate the local wave speed. In this paper we extend this work to show that determination of the time at which the PU-loop first deviates from linearity provides a conv...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-007-0241-7
更新日期:2007-12-01 00:00:00
abstract::There is multiple evidence in the literature that a sub-threshold pre-pulse, delivered immediately prior to an electrical stimulation pulse, can alter the activation threshold of nerve fibers and motor unit recruitment characteristics. So far, previously published works combined monophasic stimuli with sub-threshold d...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-018-1851-y
更新日期:2018-12-01 00:00:00
abstract::One of the most common cancer types among women is breast cancer. Regular mammographic examinations increase the possibility for early diagnosis and treatment and significantly improve the chance of survival for patients with breast cancer. Clustered microcalcifications have been considered as important indicators of ...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-006-0117-2
更新日期:2006-11-01 00:00:00
abstract::Chronic obstructive pulmonary disease (COPD) is characterized by expiratory airflow limitation, but current diagnostic criteria only consider flow till the first second and are therefore strongly debated. We aimed to develop a data-based individualized model for flow decline and to explore the relationship between mod...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-014-1202-6
更新日期:2014-12-01 00:00:00
abstract::The paper describes the application of new semi-automatic segmentation software to the task of detection of anatomical structures and lesion and their three-dimensional (3D) visualisation in 23 patients with secondary progressive multiple sclerosis (MS). The purpose is to study the correlation between magnetic resonan...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/BF02513274
更新日期:1999-01-01 00:00:00
abstract::Biomechanical models used to estimate joint loads often predict that antagonistic muscles are inactive or underestimate their contributions [3, 5]. This can result in systematic underestimation of muscle force predictions and joint contact forces. To test the feasibility of employing an empirical co-activation ratio t...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-013-1081-2
更新日期:2014-03-01 00:00:00
abstract::The mechanism of brain contusion has been investigated using a series of three-dimensional (3D) finite element analyses. A head injury model was used to simulate forward and backward rotation around the upper cervical vertebra. Intracranial pressure and shear stress responses were calculated and compared. The results ...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/BF02347044
更新日期:2000-05-01 00:00:00
abstract::This article presents a novel approach of edged and edgeless object-shape recognition and 3D reconstruction from gradient-based analysis of tactile images. We recognize an object's shape by visualizing a surface topology in our mind while grasping the object in our palm and also taking help from our past experience of...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-014-1142-1
更新日期:2014-04-01 00:00:00
abstract::We present a new, automatic, correlation-based method for measuring the duration of motor unit action potentials (MUAPs). The method seeks to replicate the way an expert elctromyographer uses his or her eyes, calculating the start and end of the MUAP waveform on the basis of the degree of similarity of non-excluded di...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-019-02115-6
更新日期:2020-03-01 00:00:00
abstract::Time-varying filtering techniques are applied to the problem of baseline correction by letting the cut-off frequency of a linear filter be controlled by the low-frequency properties of the ECG signal. The time-varying filter is implemented as a bank of linear low-pass filters, in which each filter has a slightly diffe...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/BF02441986
更新日期:1993-09-01 00:00:00
abstract::An automatic power-generating system (AGS) which converts kinetic energy into electric energy for quartz watches was tested as a power source for implantable cardiac pacemakers. An automatic power-generating mechanism and a capacitor (0.33 F) were removed from a quartz watch (SEIKO) and encapsulated in a polyvinyl cas...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/BF02513315
更新日期:1999-05-01 00:00:00
abstract::An eye pointer was developed as a new line-of-sight displacement analyser. It analyses an observer's eye movements and superimposes their line of vision on a TV image which is the same as their view. A newly developed miniature colour field camera and very compact eye-movement sensors are attached to a translucent rei...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/BF02446149
更新日期:1990-07-01 00:00:00
abstract::This study analyzes the performance of knee extension and flexion of Taekwondo and Kickboxing athletes. The power values were extracted through electromyography obtained by an isokinetic dynamometer at 60 degrees per second. These values are resulted from the square of the electromyography signal. The analysis of kick...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-010-0608-z
更新日期:2010-06-01 00:00:00