Marie-Valérie Moreno - Academia.edu (original) (raw)

Papers by Marie-Valérie Moreno

HAL (Le Centre pour la Communication Scientifique Directe), Apr 21, 2013

International audienc

Gazzetta medica italiana. Archivio per le scienze mediche, Sep 1, 2017

Elsevier Masson, Jul 4, 2008

Nutrition Clinique et Métabolisme, 2016

Introduction et but de l’etude Un enfant sur deux meurt de sous alimentation ou de malnutrition a... more Introduction et but de l’etude Un enfant sur deux meurt de sous alimentation ou de malnutrition au Mali. Le but de cette etude preliminaire est de valider un nouvel outil de detection de la denutrition chez l’enfant prenant en compte les problematiques de l’Afrique de l’ouest. Materiel et methodes L’indice de masse corporelle (IMC) a ete valide par l’OMS [1] comme critere universel de detection de la malnutrition. Des auteurs ont propose d’autres criteres de detection de la denutrition [2] , [3] , [4] , respectivement (garcons et filles) : denutrition IMC [1] [3] , [4] [5] [2] [6] , [7] pour mesurer : masse grasse, hydratation [7] , [8] et angle de phase (IAM) [3] , [4] . L’appareil avait ete modifie (jauge de detection automatique de la denutrition) pour s’adapter a cette utilisation specifique. Resultats Le Tableau 1 presente le nombre de sujets denutris detectes selon le critere choisi. On note 31,4 % d’enfants denutris selon le critere de l’IMC. Tous les enfants detectes par le critere « IMC » presentaient aussi un des autres criteres (IAM, MG ou hydratation). En revanche, certains enfants presentant une denutrition tissulaire, hydrique ou metabolique, n’ont pas tous ete detectes par l’indice IMC. Conclusion Il semblerait qu’il soit interessant d’enrichir la detection de la denutrition par d’autres criteres que l’IMC, permettant de mieux cibler la cause de la denutrition en vu d’un suivi nutritionnel cible. A terme l’objectif est de pouvoir relier (reseau mobile), les dispensaires avec les hopitaux de Bamako pour que les professionnels de sante puissent accompagner les populations isolees.

Journal of Physics: Conference Series, 2010

View the article online for updates and enhancements. You may also like Star Formation in the Loc... more View the article online for updates and enhancements. You may also like Star Formation in the Local Universe from the CALIFA Sample. II. Activation and Quenching Mechanisms in Bulges, Bars, and Disks C. Catalán-Torrecilla, A. Gil de Paz, A. Castillo-Morales et al.

Medical & Biological Engineering & Computing, 2015

The objective of this study is to evaluate the accuracy of independent hydric data for the quanti... more The objective of this study is to evaluate the accuracy of independent hydric data for the quantification of total body water (Vt), extracellular water (Ve) and intracellular water (Vi), obtained by a Z-Metrix multifrequency impedancemeter (ZM), in standing and lying position, with respect to the Xitron reference. In a second step, the aim is also to consider whether it is possible to quantify daily hydration. As part of the clinical study No. A01373-52-2008, 97 healthy subjects underwent ZM impedance with 29 of them also assessing Xitron. Note that the average repeatability error of the ZM impedancemeter is less than 0.5%. For total body water (Vt), we note a low R ² dispersion with an average of respectively 0.9 for men and 0.6 for women. The estimation of the total body water is more accurate for women with a maximum error of 1.8% in standing position against 3.9% for men in the same position. We note a low R ² dispersion respectively of 0.965 for men and of 0.84 for women. The estimation of extracellular water is equivalent with a maximum error of 3.1% in standing position for women against 2.97 % for men in the same position. The estimation of the total body water by direct measurement and by summing the volumes of extracellular and intracellular water obtained by the Z-Metrix ® shows very low dispersions with R ² equal to 0.89, and average error from 1.3 % for healthy women in lying position to 3.9% for healthy women in standing position. Finally, despite the impact of events on the daily impedance measurements, it is viable to track a subject's overall hydration.

Http Www Theses Fr, 2007

L'étude de la composition corporelle permet notamment le suivi des volumes en eau du corps, d... more L'étude de la composition corporelle permet notamment le suivi des volumes en eau du corps, du taux d'hydratation, ainsi que celui de la masse grasse, de la masse musculaire et de la masse cellulaire active. La bioimpédance permet d'accéder à ces informations de façon non invasive, indolore et peu coûteuse. Notre objectif a été de développer de nouvelles fonctionnalités pour un prototype de pèse-personne impédancemètre, souhaitant apporter ainsi des outils complémentaires au personnel médical. Pour ce faire, nous avons étudié des populations d'enfants et d'adultes sains et pathologiques. Nous avons utilisé un impédancemètre multifréquence, un prototype de pèse-personne impédancemètre permettant d'obtenir en plus de la masse grasse, les résistances à basse et haute fréquence, ainsi qu'un DEXA. Nous avons ainsi développé des équations permettant au prototype de donner les volumes en eau extracellulaire et totale, en plus de la masse maigre du corps. Nous avons aussi confirmé l'intérêt de paramètres tels que la phase ou la masse cellulaire pour le suivi de la dénutrition ou proposé de nouveaux indices tels que le rapport de la résistance extracellulaire sur la résistance à fréquence infinie. Nous avons aussi montré la fiabilité de l'impédancemétrie pour le suivi de surcharges hydriques et des thérapies associées.Measurements of body composition permits the monitoring of water volumes, of the rate of hydration, as well as fat mass, muscle mass and body cell mass. Bioimpedance is a very convenient tool as it is non-invasive, painless and inexpensive. Our goal was to develop new functionalities for a prototype foot-to-foot impedancemeter, in order to bring additional tools to the medical staff. To this effect, we have studied populations of children and adults, healthy and pathological. We have used a multifrequency medical impedancemeter, a prototype foot-to-foot impedancemeter permitting to obtain fat mass, low and high frequency resistances, and Dual energy X-Ray absorptiometry. We have developed for this prototype equations giving extracellular and total body water volumes, in addition to lean body mass. We have also confirmed the importance of parameters such as the phase or body cell mass for monitoring malnutrition or proposed new indices such as the ratio of extracellular resistance to infinite resistance. We have also demonstrated the reliability of impedancemetry for monitoring excess water and associated therapies.COMPIEGNE-BU (601592101) / SudocSudocFranceF

Medical Engineering & Physics, 2008

Our main goal was to test various impedance methods for measuring body composition in adolescents... more Our main goal was to test various impedance methods for measuring body composition in adolescents with anorexia nervosa (AN) during refeeding therapy. A specific objective was to compare the information provided by a foot-to-foot impedancemeter (FFI) with that supplied by a medical multifrequency impedancemeter and by dual X-ray absorptiometry (DXA). We have monitored 13 young AN subjects and 17 healthy controls of a similar age group using a Xitron 4200 multifrequency impedancemeter measuring extracellular (ECW) and total body water (TBW) volumes and a Tefal Bodymaster FFI measuring weight (W), fat-free-mass (FFM) and body fat mass (FM). This Tefal device has been modified to measure in addition ECW and TBW resistances permitting to calculate ECW and TBW volumes using appropriate algorithms. In addition FFM and FM were measured by DXA on AN subjects. FFM measured by the FFI and the Xitron in AN subjects were found to be respectively 7.8% and 4.5% lower than FFM measured by DXA. TBW measured by FFI was not significantly different from that measured by Xitron in AN subjects and in controls. ECW measured by the FFI was not significantly different from that measured by Xitron in controls, but was in AN subjects. The body cell mass to (height) 2 ratio was found to be significantly different between AN subjects and controls. The modified FFI was found to be simpler and quicker to use than the Xitron, while giving similar information.

Journal of Physics: Conference Series, 2013

ABSTRACT

Computer Methods in Biomechanics and Biomedical Engineering, 2005

... In Emulsions Science ed. by Sherman DH London, Academic Press, 1968, pp. 354-477 [2] Ellis KJ... more ... In Emulsions Science ed. by Sherman DH London, Academic Press, 1968, pp. 354-477 [2] Ellis KJ, W ong WW . J Appl Physiol 2998; 85:1056 [3] Fenech M, Jaffrin MY, Dabaja Z. XXVIII SB congress, Poitiers, 2003. [4] MY. Jaffrin, R Kieffer, MV Moreno. Nutrition (in press), 2005.

Medical & Biological Engineering & Computing, 2006

We propose a method for calculating directly total body water (TBW) volumes (V t) from whole body... more We propose a method for calculating directly total body water (TBW) volumes (V t) from whole body resistance extrapolated at infinite frequency (R ¥) using a XITRON 4200 impedance meter. Mean TBW resistivities for men and women were determined from measurements of R ¥ and fat-free mass (FFM d) measured by DXA in 58 healthy subjects assuming an average hydration coefficient of 73.2%. Mean differences between V t measured by our new method and those deduced from DXA data were +0.11 ± 1.61 L for women and +0.13 ± 2.16 L for men. For validation, this method was tested with the same resistivities against a 2nd group of 16 volunteers and the mean difference between V t from impedance and DXA was-0.80 ± 1.43 L. Since the resistance at 50 kHz (R 50) was found to be equal, in average, to 1.230 R ¥ for men and 1.223 R ¥ for women, this method can also be applied at 50 kHz with a similar accuracy by estimating R ¥ from R 50. When our new method was applied to the monitoring of water loss during 28 dialysis runs performed on 13 patients, it predicted a mean water loss equal to 94% of ultrafiltered volume.

IFMBE Proceedings

... and intracellular fluid volumes in dialyzed patients by bio-impedance and hematocrit measurem... more ... and intracellular fluid volumes in dialyzed patients by bio-impedance and hematocrit measurements”, ASAIO J, 2002, 48:326 4. Jaffrin MY, Fenech M, Moreno MV, Kieffer R (2006) Total body water measurements by a modification of the bioimpedance spectros-copy method. ...

Journal of Biomechanics, 2006

ABSTRACT The objective was to set-up a method for measuring total body water volumes (TBW) using ... more ABSTRACT The objective was to set-up a method for measuring total body water volumes (TBW) using a Tefal foot-to-foot impedancemeter (FFI) by comparison with a multifrequency medical impedancemeter and to validate this method against deuterium dilution data. The investigation was carried out in 57 Caucasian adult subjects. Impedancemeters were a Tefal Bodymaster Vision (foot-to-foot) featuring a square wave signal and a Xitron Hydra 4200 (5-1000 kHz) using BIS method. TBW was measured by the Xitron using a new method that we have developed which applies the BIS method directly to extra and intracellular fluids combined. Although the high frequency impedance of the FFI (R(hf)) was higher than the Xitron infinite frequency resistance and corresponded to a frequency around 100 kHz, TBW differences between the FFI and Xitron were not significant, 0.17+/-2.17 L for men (P=0.694) and 0.04+/-1.88 L for women (P=0.902). Then, our method was tested on another Caucasian population in which R(hf) had been measured with the same FFI, together with TBW measurements by deuterium dilution. TBW differences between the FFI and dilution were -0.38+/-2.27 L for men (P=0.237) and -0.72+/-2.37 L for women (P=0.06). Our method permits, at least in a Caucasian healthy population, to measure TBW using this FFI with the same accuracy as a whole body multifrequency medical impedancemeter, and the measurement, made in upright position, is much quicker.

Journal of Biomechanics, 2006

Foot-to-foot impedancemeters (FFI) are cheaper, simpler and quicker to use than medical type impe... more Foot-to-foot impedancemeters (FFI) are cheaper, simpler and quicker to use than medical type impedancemeters. The purpose of this work was to increase the functions of a prototype FFI derived from a commercially available FFI (Tefal Bodymaster Vision ,Rumilly, France) with performing electronics, in order to obtain extracellular (ECW), total body water (TBW) volumes, body cell mass (BCM) and muscle mass in addition to weight and fat-free mass. A modification of the FFI permitted also to use it with hand and feet reusable electrodes. ECW and TBW measurements with the FFI were achieved by comparison with measurements made using a multifrequency medical impedancemeter Hydra 4200 (Xitron Tech, San Diego) and Dual X ray absorptiometry and appropriate modifications of the bioimpedance spectroscopic (BIS) method (1, 2). For BCM and muscle mass, we used Kotler’s and Wang’s methods respectively to relate them to the total body potassium concentration TBK as BCM = 0.0083 TBK, Muscle mass=0.0093 TBK+0.024 Age-3.21 where TBK is expressed in terms of Xcp, the equivalent reactance at 50 kHz, the subject height H, and his weight W. These methods were applied on a group of 52 children: 12 controls did not practice exercise, 20 jogged intermittently and 20 jogged regularly for three months. Changes in all the physiologic parameters listed above during this period as well as improvement in running speed for the three groups were compared and will be reported. With further development, this FFI prototype, which is easy to

Journal of Physics: Conference Series, 2013

ABSTRACT Body composition is a useful means for athletes' body composition assessment, re... more ABSTRACT Body composition is a useful means for athletes' body composition assessment, relying on reference population data. This study aims at comparing body composition multifrequency impedance data of athletes and healthy adult populations. Differences were found in tissular, hydration and metabolic indices. They were significant, in the expected direction, but quite weak and additional data from reference technologies would set if specific equations are needed. The current ones are nevertheless suitable for reliable follow-up studies.

L'étude de la composition corporelle permet notamment le suivi des volumes en eau du corps, d... more L'étude de la composition corporelle permet notamment le suivi des volumes en eau du corps, du taux d'hydratation, ainsi que celui de la masse grasse, de la masse musculaire et de la masse cellulaire active. La bioimpédance permet d'accéder à ces informations de façon non invasive, indolore et peu coûteuse. Notre objectif a été de développer de nouvelles fonctionnalités pour un prototype de pèse-personne impédancemètre, souhaitant apporter ainsi des outils complémentaires au personnel médical. Pour ce faire, nous avons étudié des populations d'enfants et d'adultes sains et pathologiques. Nous avons utilisé un impédancemètre multifréquence, un prototype de pèse-personne impédancemètre permettant d'obtenir en plus de la masse grasse, les résistances à basse et haute fréquence, ainsi qu'un DEXA. Nous avons ainsi développé des équations permettant au prototype de donner les volumes en eau extracellulaire et totale, en plus de la masse maigre du corps. Nous av...

Nutrition Clinique et Métabolisme, 2014

Introduction et but de l’etude Le suivi de la composition corporelle est demontre comme pertinent... more Introduction et but de l’etude Le suivi de la composition corporelle est demontre comme pertinent pour realiser un suivi de qualite chez le sportif[1], la personne âgee[2], ou encore la personne en perte de poids. Differentes techniques permettent de mesurer tissus, metabolisme et fluides notamment sur le corps entier. Aujourd’hui, il est possible d’etablir un lien entre l’alimentation, l’activite physique et les resultats de composition corporelle, ce qui permet d’augmenter la pertinence des interpretations, dans divers domaines notamment pour le suivi de la perte de poids. Le but de cette etude est de quantifier l’impact d’un programme alimentaire, base sur la micro-nutrition, et d’un programme d’activite physique sur les indices de composition corporelle. Materiel et methodes Un echantillon de 27 sujets sains a ete analyse a l’aide d’un impedancemetre multifrequence, valide clini-quement [3 ;4] et marque Ce Medical (Z-Metrix®, BioparHom©). Les indices metaboliques (masse cellulaire active (MCA) et indice d’activite metabolique (IAM)), tissulaires (masse grasse (MG), masse musculaire (MMus)) et hydriques (eau totale (Vt)) ont ete calcules. Un score sur 20, tres apprecie par le corps medical. est ensuite calcule pour chaque bloc d’indices. Durant l’etude (3-12mois), les sujets ont ete mesures entre 3 et 5 fois. Pendant l’etude, le programme nutritionnel a ete etabli par une dieteticienne clinique diplomee. Les programmes alimentaires sont modelises dans un logiciel de nutrition Bionut® (BioparHom©, France). Ce savoir-faire a ete implemente dans un logiciel qui propose des plans alimentaires en relation directe avec les parametres de composition corporelle. Par exemple, si un sujet a une masse grasse au-dessus des normes de bonne sante, le logiciel proposera un plan alimentaire comprenant des aliments pauvres en graisse. Resultats et Analyse statistique Le poids des sujets a diminue d’en moyenne 6,4kg ± 3,5. Leur masse grasse a diminue de facon significative (p Le score metabolique n’a pas evolue de facon significative, il passe de 17,89 a 18,52 (+0,63), tout comme le score hydrique qui passe d’en moyenne 10,74 a 10,11 (-0,11). Le score tissulaire a augmente de 2,22 points de facon significative, en augmentant de 11,86 a 14,08. Conclusion les resultats obtenus avec l’impedance multifrequence combine a un programme nutritionnel personnalise et en lien direct avec la composition corporelle ont mis en evidence un outil pertinent pour la perte de poids. Cet outil peut permettre d’ameliorer la pratique pour les therapeutes afin de gerer la sarcopenie, la deshydratation, l’obesite ou encore la denutrition

Sensors (Basel, Switzerland), 2021

The physiology of the patient can be reflected by various data. Serious games, using an intellige... more The physiology of the patient can be reflected by various data. Serious games, using an intelligent combination, could be based on this data to adjust to the specificities of the patient. Rehabilitation would therefore be personalized to the patient. This smart suit would use dry electrodes in order to be easily usable. Before performing dry electrode validation tests on a population, it is necessary to perform preliminary tests on a phantom. Agar-Agar (AA) gel, combined with NaCl and graphite which directly impact the resistivity and reactance values of the phantom, are generally used. Depending on the part of the body simulated by the phantom, it is necessary to adapt the concentrations of NaCl and graphite in order to obtain values of physiological reactance and resistance. The anisotropy of a muscle must also be considered. Different concentrations of NaCl and graphite have been tested in order to present charts linking the concentrations to the resistance and reactance values o...

HAL (Le Centre pour la Communication Scientifique Directe), Apr 21, 2013

International audienc

Gazzetta medica italiana. Archivio per le scienze mediche, Sep 1, 2017

Elsevier Masson, Jul 4, 2008

Nutrition Clinique et Métabolisme, 2016

Introduction et but de l’etude Un enfant sur deux meurt de sous alimentation ou de malnutrition a... more Introduction et but de l’etude Un enfant sur deux meurt de sous alimentation ou de malnutrition au Mali. Le but de cette etude preliminaire est de valider un nouvel outil de detection de la denutrition chez l’enfant prenant en compte les problematiques de l’Afrique de l’ouest. Materiel et methodes L’indice de masse corporelle (IMC) a ete valide par l’OMS [1] comme critere universel de detection de la malnutrition. Des auteurs ont propose d’autres criteres de detection de la denutrition [2] , [3] , [4] , respectivement (garcons et filles) : denutrition IMC [1] [3] , [4] [5] [2] [6] , [7] pour mesurer : masse grasse, hydratation [7] , [8] et angle de phase (IAM) [3] , [4] . L’appareil avait ete modifie (jauge de detection automatique de la denutrition) pour s’adapter a cette utilisation specifique. Resultats Le Tableau 1 presente le nombre de sujets denutris detectes selon le critere choisi. On note 31,4 % d’enfants denutris selon le critere de l’IMC. Tous les enfants detectes par le critere « IMC » presentaient aussi un des autres criteres (IAM, MG ou hydratation). En revanche, certains enfants presentant une denutrition tissulaire, hydrique ou metabolique, n’ont pas tous ete detectes par l’indice IMC. Conclusion Il semblerait qu’il soit interessant d’enrichir la detection de la denutrition par d’autres criteres que l’IMC, permettant de mieux cibler la cause de la denutrition en vu d’un suivi nutritionnel cible. A terme l’objectif est de pouvoir relier (reseau mobile), les dispensaires avec les hopitaux de Bamako pour que les professionnels de sante puissent accompagner les populations isolees.

Journal of Physics: Conference Series, 2010

View the article online for updates and enhancements. You may also like Star Formation in the Loc... more View the article online for updates and enhancements. You may also like Star Formation in the Local Universe from the CALIFA Sample. II. Activation and Quenching Mechanisms in Bulges, Bars, and Disks C. Catalán-Torrecilla, A. Gil de Paz, A. Castillo-Morales et al.

Medical & Biological Engineering & Computing, 2015

The objective of this study is to evaluate the accuracy of independent hydric data for the quanti... more The objective of this study is to evaluate the accuracy of independent hydric data for the quantification of total body water (Vt), extracellular water (Ve) and intracellular water (Vi), obtained by a Z-Metrix multifrequency impedancemeter (ZM), in standing and lying position, with respect to the Xitron reference. In a second step, the aim is also to consider whether it is possible to quantify daily hydration. As part of the clinical study No. A01373-52-2008, 97 healthy subjects underwent ZM impedance with 29 of them also assessing Xitron. Note that the average repeatability error of the ZM impedancemeter is less than 0.5%. For total body water (Vt), we note a low R ² dispersion with an average of respectively 0.9 for men and 0.6 for women. The estimation of the total body water is more accurate for women with a maximum error of 1.8% in standing position against 3.9% for men in the same position. We note a low R ² dispersion respectively of 0.965 for men and of 0.84 for women. The estimation of extracellular water is equivalent with a maximum error of 3.1% in standing position for women against 2.97 % for men in the same position. The estimation of the total body water by direct measurement and by summing the volumes of extracellular and intracellular water obtained by the Z-Metrix ® shows very low dispersions with R ² equal to 0.89, and average error from 1.3 % for healthy women in lying position to 3.9% for healthy women in standing position. Finally, despite the impact of events on the daily impedance measurements, it is viable to track a subject's overall hydration.

Http Www Theses Fr, 2007

L'étude de la composition corporelle permet notamment le suivi des volumes en eau du corps, d... more L'étude de la composition corporelle permet notamment le suivi des volumes en eau du corps, du taux d'hydratation, ainsi que celui de la masse grasse, de la masse musculaire et de la masse cellulaire active. La bioimpédance permet d'accéder à ces informations de façon non invasive, indolore et peu coûteuse. Notre objectif a été de développer de nouvelles fonctionnalités pour un prototype de pèse-personne impédancemètre, souhaitant apporter ainsi des outils complémentaires au personnel médical. Pour ce faire, nous avons étudié des populations d'enfants et d'adultes sains et pathologiques. Nous avons utilisé un impédancemètre multifréquence, un prototype de pèse-personne impédancemètre permettant d'obtenir en plus de la masse grasse, les résistances à basse et haute fréquence, ainsi qu'un DEXA. Nous avons ainsi développé des équations permettant au prototype de donner les volumes en eau extracellulaire et totale, en plus de la masse maigre du corps. Nous avons aussi confirmé l'intérêt de paramètres tels que la phase ou la masse cellulaire pour le suivi de la dénutrition ou proposé de nouveaux indices tels que le rapport de la résistance extracellulaire sur la résistance à fréquence infinie. Nous avons aussi montré la fiabilité de l'impédancemétrie pour le suivi de surcharges hydriques et des thérapies associées.Measurements of body composition permits the monitoring of water volumes, of the rate of hydration, as well as fat mass, muscle mass and body cell mass. Bioimpedance is a very convenient tool as it is non-invasive, painless and inexpensive. Our goal was to develop new functionalities for a prototype foot-to-foot impedancemeter, in order to bring additional tools to the medical staff. To this effect, we have studied populations of children and adults, healthy and pathological. We have used a multifrequency medical impedancemeter, a prototype foot-to-foot impedancemeter permitting to obtain fat mass, low and high frequency resistances, and Dual energy X-Ray absorptiometry. We have developed for this prototype equations giving extracellular and total body water volumes, in addition to lean body mass. We have also confirmed the importance of parameters such as the phase or body cell mass for monitoring malnutrition or proposed new indices such as the ratio of extracellular resistance to infinite resistance. We have also demonstrated the reliability of impedancemetry for monitoring excess water and associated therapies.COMPIEGNE-BU (601592101) / SudocSudocFranceF

Medical Engineering & Physics, 2008

Our main goal was to test various impedance methods for measuring body composition in adolescents... more Our main goal was to test various impedance methods for measuring body composition in adolescents with anorexia nervosa (AN) during refeeding therapy. A specific objective was to compare the information provided by a foot-to-foot impedancemeter (FFI) with that supplied by a medical multifrequency impedancemeter and by dual X-ray absorptiometry (DXA). We have monitored 13 young AN subjects and 17 healthy controls of a similar age group using a Xitron 4200 multifrequency impedancemeter measuring extracellular (ECW) and total body water (TBW) volumes and a Tefal Bodymaster FFI measuring weight (W), fat-free-mass (FFM) and body fat mass (FM). This Tefal device has been modified to measure in addition ECW and TBW resistances permitting to calculate ECW and TBW volumes using appropriate algorithms. In addition FFM and FM were measured by DXA on AN subjects. FFM measured by the FFI and the Xitron in AN subjects were found to be respectively 7.8% and 4.5% lower than FFM measured by DXA. TBW measured by FFI was not significantly different from that measured by Xitron in AN subjects and in controls. ECW measured by the FFI was not significantly different from that measured by Xitron in controls, but was in AN subjects. The body cell mass to (height) 2 ratio was found to be significantly different between AN subjects and controls. The modified FFI was found to be simpler and quicker to use than the Xitron, while giving similar information.

Journal of Physics: Conference Series, 2013

ABSTRACT

Computer Methods in Biomechanics and Biomedical Engineering, 2005

... In Emulsions Science ed. by Sherman DH London, Academic Press, 1968, pp. 354-477 [2] Ellis KJ... more ... In Emulsions Science ed. by Sherman DH London, Academic Press, 1968, pp. 354-477 [2] Ellis KJ, W ong WW . J Appl Physiol 2998; 85:1056 [3] Fenech M, Jaffrin MY, Dabaja Z. XXVIII SB congress, Poitiers, 2003. [4] MY. Jaffrin, R Kieffer, MV Moreno. Nutrition (in press), 2005.

Medical & Biological Engineering & Computing, 2006

We propose a method for calculating directly total body water (TBW) volumes (V t) from whole body... more We propose a method for calculating directly total body water (TBW) volumes (V t) from whole body resistance extrapolated at infinite frequency (R ¥) using a XITRON 4200 impedance meter. Mean TBW resistivities for men and women were determined from measurements of R ¥ and fat-free mass (FFM d) measured by DXA in 58 healthy subjects assuming an average hydration coefficient of 73.2%. Mean differences between V t measured by our new method and those deduced from DXA data were +0.11 ± 1.61 L for women and +0.13 ± 2.16 L for men. For validation, this method was tested with the same resistivities against a 2nd group of 16 volunteers and the mean difference between V t from impedance and DXA was-0.80 ± 1.43 L. Since the resistance at 50 kHz (R 50) was found to be equal, in average, to 1.230 R ¥ for men and 1.223 R ¥ for women, this method can also be applied at 50 kHz with a similar accuracy by estimating R ¥ from R 50. When our new method was applied to the monitoring of water loss during 28 dialysis runs performed on 13 patients, it predicted a mean water loss equal to 94% of ultrafiltered volume.

IFMBE Proceedings

... and intracellular fluid volumes in dialyzed patients by bio-impedance and hematocrit measurem... more ... and intracellular fluid volumes in dialyzed patients by bio-impedance and hematocrit measurements”, ASAIO J, 2002, 48:326 4. Jaffrin MY, Fenech M, Moreno MV, Kieffer R (2006) Total body water measurements by a modification of the bioimpedance spectros-copy method. ...

Journal of Biomechanics, 2006

ABSTRACT The objective was to set-up a method for measuring total body water volumes (TBW) using ... more ABSTRACT The objective was to set-up a method for measuring total body water volumes (TBW) using a Tefal foot-to-foot impedancemeter (FFI) by comparison with a multifrequency medical impedancemeter and to validate this method against deuterium dilution data. The investigation was carried out in 57 Caucasian adult subjects. Impedancemeters were a Tefal Bodymaster Vision (foot-to-foot) featuring a square wave signal and a Xitron Hydra 4200 (5-1000 kHz) using BIS method. TBW was measured by the Xitron using a new method that we have developed which applies the BIS method directly to extra and intracellular fluids combined. Although the high frequency impedance of the FFI (R(hf)) was higher than the Xitron infinite frequency resistance and corresponded to a frequency around 100 kHz, TBW differences between the FFI and Xitron were not significant, 0.17+/-2.17 L for men (P=0.694) and 0.04+/-1.88 L for women (P=0.902). Then, our method was tested on another Caucasian population in which R(hf) had been measured with the same FFI, together with TBW measurements by deuterium dilution. TBW differences between the FFI and dilution were -0.38+/-2.27 L for men (P=0.237) and -0.72+/-2.37 L for women (P=0.06). Our method permits, at least in a Caucasian healthy population, to measure TBW using this FFI with the same accuracy as a whole body multifrequency medical impedancemeter, and the measurement, made in upright position, is much quicker.

Journal of Biomechanics, 2006

Foot-to-foot impedancemeters (FFI) are cheaper, simpler and quicker to use than medical type impe... more Foot-to-foot impedancemeters (FFI) are cheaper, simpler and quicker to use than medical type impedancemeters. The purpose of this work was to increase the functions of a prototype FFI derived from a commercially available FFI (Tefal Bodymaster Vision ,Rumilly, France) with performing electronics, in order to obtain extracellular (ECW), total body water (TBW) volumes, body cell mass (BCM) and muscle mass in addition to weight and fat-free mass. A modification of the FFI permitted also to use it with hand and feet reusable electrodes. ECW and TBW measurements with the FFI were achieved by comparison with measurements made using a multifrequency medical impedancemeter Hydra 4200 (Xitron Tech, San Diego) and Dual X ray absorptiometry and appropriate modifications of the bioimpedance spectroscopic (BIS) method (1, 2). For BCM and muscle mass, we used Kotler’s and Wang’s methods respectively to relate them to the total body potassium concentration TBK as BCM = 0.0083 TBK, Muscle mass=0.0093 TBK+0.024 Age-3.21 where TBK is expressed in terms of Xcp, the equivalent reactance at 50 kHz, the subject height H, and his weight W. These methods were applied on a group of 52 children: 12 controls did not practice exercise, 20 jogged intermittently and 20 jogged regularly for three months. Changes in all the physiologic parameters listed above during this period as well as improvement in running speed for the three groups were compared and will be reported. With further development, this FFI prototype, which is easy to

Journal of Physics: Conference Series, 2013

ABSTRACT Body composition is a useful means for athletes' body composition assessment, re... more ABSTRACT Body composition is a useful means for athletes' body composition assessment, relying on reference population data. This study aims at comparing body composition multifrequency impedance data of athletes and healthy adult populations. Differences were found in tissular, hydration and metabolic indices. They were significant, in the expected direction, but quite weak and additional data from reference technologies would set if specific equations are needed. The current ones are nevertheless suitable for reliable follow-up studies.

L'étude de la composition corporelle permet notamment le suivi des volumes en eau du corps, d... more L'étude de la composition corporelle permet notamment le suivi des volumes en eau du corps, du taux d'hydratation, ainsi que celui de la masse grasse, de la masse musculaire et de la masse cellulaire active. La bioimpédance permet d'accéder à ces informations de façon non invasive, indolore et peu coûteuse. Notre objectif a été de développer de nouvelles fonctionnalités pour un prototype de pèse-personne impédancemètre, souhaitant apporter ainsi des outils complémentaires au personnel médical. Pour ce faire, nous avons étudié des populations d'enfants et d'adultes sains et pathologiques. Nous avons utilisé un impédancemètre multifréquence, un prototype de pèse-personne impédancemètre permettant d'obtenir en plus de la masse grasse, les résistances à basse et haute fréquence, ainsi qu'un DEXA. Nous avons ainsi développé des équations permettant au prototype de donner les volumes en eau extracellulaire et totale, en plus de la masse maigre du corps. Nous av...

Nutrition Clinique et Métabolisme, 2014

Introduction et but de l’etude Le suivi de la composition corporelle est demontre comme pertinent... more Introduction et but de l’etude Le suivi de la composition corporelle est demontre comme pertinent pour realiser un suivi de qualite chez le sportif[1], la personne âgee[2], ou encore la personne en perte de poids. Differentes techniques permettent de mesurer tissus, metabolisme et fluides notamment sur le corps entier. Aujourd’hui, il est possible d’etablir un lien entre l’alimentation, l’activite physique et les resultats de composition corporelle, ce qui permet d’augmenter la pertinence des interpretations, dans divers domaines notamment pour le suivi de la perte de poids. Le but de cette etude est de quantifier l’impact d’un programme alimentaire, base sur la micro-nutrition, et d’un programme d’activite physique sur les indices de composition corporelle. Materiel et methodes Un echantillon de 27 sujets sains a ete analyse a l’aide d’un impedancemetre multifrequence, valide clini-quement [3 ;4] et marque Ce Medical (Z-Metrix®, BioparHom©). Les indices metaboliques (masse cellulaire active (MCA) et indice d’activite metabolique (IAM)), tissulaires (masse grasse (MG), masse musculaire (MMus)) et hydriques (eau totale (Vt)) ont ete calcules. Un score sur 20, tres apprecie par le corps medical. est ensuite calcule pour chaque bloc d’indices. Durant l’etude (3-12mois), les sujets ont ete mesures entre 3 et 5 fois. Pendant l’etude, le programme nutritionnel a ete etabli par une dieteticienne clinique diplomee. Les programmes alimentaires sont modelises dans un logiciel de nutrition Bionut® (BioparHom©, France). Ce savoir-faire a ete implemente dans un logiciel qui propose des plans alimentaires en relation directe avec les parametres de composition corporelle. Par exemple, si un sujet a une masse grasse au-dessus des normes de bonne sante, le logiciel proposera un plan alimentaire comprenant des aliments pauvres en graisse. Resultats et Analyse statistique Le poids des sujets a diminue d’en moyenne 6,4kg ± 3,5. Leur masse grasse a diminue de facon significative (p Le score metabolique n’a pas evolue de facon significative, il passe de 17,89 a 18,52 (+0,63), tout comme le score hydrique qui passe d’en moyenne 10,74 a 10,11 (-0,11). Le score tissulaire a augmente de 2,22 points de facon significative, en augmentant de 11,86 a 14,08. Conclusion les resultats obtenus avec l’impedance multifrequence combine a un programme nutritionnel personnalise et en lien direct avec la composition corporelle ont mis en evidence un outil pertinent pour la perte de poids. Cet outil peut permettre d’ameliorer la pratique pour les therapeutes afin de gerer la sarcopenie, la deshydratation, l’obesite ou encore la denutrition

Sensors (Basel, Switzerland), 2021

The physiology of the patient can be reflected by various data. Serious games, using an intellige... more The physiology of the patient can be reflected by various data. Serious games, using an intelligent combination, could be based on this data to adjust to the specificities of the patient. Rehabilitation would therefore be personalized to the patient. This smart suit would use dry electrodes in order to be easily usable. Before performing dry electrode validation tests on a population, it is necessary to perform preliminary tests on a phantom. Agar-Agar (AA) gel, combined with NaCl and graphite which directly impact the resistivity and reactance values of the phantom, are generally used. Depending on the part of the body simulated by the phantom, it is necessary to adapt the concentrations of NaCl and graphite in order to obtain values of physiological reactance and resistance. The anisotropy of a muscle must also be considered. Different concentrations of NaCl and graphite have been tested in order to present charts linking the concentrations to the resistance and reactance values o...