scholarly journals Bioelectrical Impedance Vector Analysis and Phase Angle on Different Oral Zinc Supplementation in Eutrophic Children: Randomized Triple-Blind Study

Nutrients ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1215 ◽  
Author(s):  
Karina M. Vermeulen ◽  
Márcia Marília G. D. Lopes ◽  
Camila X. Alves ◽  
Naira J. N. Brito ◽  
Maria das Graças Almeida ◽  
...  

The parameters derived from bioelectrical impedance, phase angle (PA) and bioelectrical impedance vector analysis (BIVA) have been associated with cell membrane integrity and body cell mass. Zinc is a micronutrient that exerts important structural functions and acts in maintaining cellular functionality. To evaluate cell integrity and body cell mass, PA and BIVA were evaluated in children orally supplemented with zinc at different concentrations. Anthropometric, bioelectrical (resistance and reactance) and serum zinc variables were collected from two randomized, triple-blind, controlled clinical trials. Sampling was composed of 71 children consisting of three groups: a control group who received a placebo and two experimental groups who received oral supplementation of 5 or 10 mg-Zn/day for three months. The three groups presented increases (p < 0.001) in the linear height and weight. In the group supplemented with 10 mg-Zn/day, there was an increase in reactance values (p = 0.036) and PA (p = 0.002), in addition to vector displacement (p < 0.001) in relation to the confidence ellipses. An increase in serum zinc concentration was found (p < 0.001) in all three groups. Whit this, the supplementation with 10 mg-Zn/day promotes changes in the integrity of the cell membrane associated with the increase in the cellular mass of healthy children.

Author(s):  
Marilia Firmino De Castro Ribeiro ◽  
Juliana Megumi Nisio dos Reis ◽  
Ana Paula Bazanelli

Os parâmetros não tradicionais derivados da bioimpedância elétrica (BIA) como reatância, ângulo de fase e massa celular estão cada vez sendo mais utilizados na prática clínica para auxiliar no diagnóstico nutricional dos pacientes com doença renal crônica e, consequentemente, no prognóstico clínico dessa população. O presente estudo teve por objetivo avaliar a relação dos parâmetros derivados da BIA com o estado nutricional de pacientes em hemodiálise. Estudo transversal, realizado com trinta pacientes adultos de uma clínica de Nefrologia localizada na região metropolitana de São Paulo. Foi utilizada a BIA para avaliar esses parâmetros, assim como para avaliar a composição corporal. A amostra foi constituída por homens e mulheres com média de idade de aproximadamente 56 anos. O ângulo de fase dos pacientes foi de 5,9±1,6 graus e apresentou uma correlação negativa com idade (r= -0,69, p< 0,001) e água corporal extracelular (r= -0,93 p< 0,001). A média de reatância foi de 50,9±16,08 ohms e apresentou correlação negativa com a água extracelular (r= -0,82, p<0,001) e positiva com a massa celular (r=0,51, p<0,004). Em relação ao percentual de massa celular, a média foi de 36,8± 6,1%, sendo que a mesma apresentou uma correlação negativa com a idade (r= -0,66, p< 0,001), gordura corporal (r= -0,73, p< 0,001), água corporal extracelular (r= -0,82, p<0,001).Conclui-se que os parâmetros não tradicionais derivados da BIA apresentaram boa associação com o estado nutricional dos pacientes, podendo dessa forma, serem aliados importantes para obtenção do melhor diagnóstico nutricional e, consequentemente, do prognóstico dos mesmos durante o tratamento dialítico.Palavras-chave: Bioimpedância Elétrica. Estado Nutricional. Diálise.AbstractNon-traditional parameters derived from bioelectrical impedance analysis (BIA) as reactance, phase angle and cell mass are increasingly being used in clinical practice to improve the nutritionalstatus of chronic kidney disease patients andthe clinical outcomes in this population. The present study aimed to evaluate the relationship of parameters derived from the BIA with nutritional status of hemodialysis patients. It was a cross-sectional study with 30 adultspatients of a nephrology clinic in the metropolitan region of São Paulo. BIA was used to evaluate as well as to assess the body composition. The mean age of the patients was approximately 56 years. The phase angle of the patients was 5.9 ± 1.6 degrees and it was negatively correlated with age (r = -0.69, p <0.001) andwith extracellular body water (r = -0.93 p <0.001). The mean reactance was 50.9 ± 16.08 ohms and it showed a negative correlation with the extracellular water (r = -0.82, p <0.001) and positively with the body cell mass (r = 0.51, p <0.004). Regarding to the percentage of body cell mass, the mean was 36.8 ± 6.1%, and it presented a negative correlation with age (r = -0.66, p <0.001), body fat (r = -0.73, p <0.001) and with body water extracellular (r = -0.82, p <0.001). The present study concluded that non-traditional parameters derived from BIA showed a good association with the nutritional status of hemodialysis patients. It is important for getting the best nutritional diagnosis and consequently the prognosis of these patientsduring the dialysis treatment.Keywords: Bioelectrical Impedance. Nutritional Status. Dialysis.


2020 ◽  
Vol 15 (3) ◽  
pp. 361-367 ◽  
Author(s):  
Francesco Campa ◽  
Catarina N. Matias ◽  
Elisabetta Marini ◽  
Steven B. Heymsfield ◽  
Stefania Toselli ◽  
...  

Purpose: To analyze the association between body fluid changes evaluated by bioelectrical impedance vector analysis and dilution techniques over a competitive season in athletes. Methods: A total of 58 athletes of both sexes (men: age 18.7 [4.0] y and women: age 19.2 [6.0] y) engaging in different sports were evaluated at the beginning (pre) and 6 months after (post) the competitive season. Deuterium dilution and bromide dilution were used as the criterion methods to assess total body water (TBW) and extracellular water (ECW), respectively; intracellular water (ICW) was calculated as TBW–ECW. Bioelectrical resistance and reactance were obtained with a phase-sensitive 50-kHz bioelectrical impedance analysis device; bioelectrical impedance vector analysis was applied. Dual-energy X-ray absorptiometry was used to assess fat mass and fat-free mass. The athletes were empirically classified considering TBW change (pre–post, increase or decrease) according to sex. Results: Significant mean vector displacements in the postgroups were observed in both sexes. Specifically, reductions in vector length (Z/H) were associated with increases in TBW and ICW (r = −.718, P < .01; r = −.630, P < .01, respectively) and decreases in ECW:ICW ratio (r = .344, P < .05), even after adjusting for age, height, and sex. Phase-angle variations were positively associated with TBW and ICW (r = .458, P < .01; r = .564, P < .01, respectively) and negatively associated with ECW:ICW (r = −.436, P < .01). Phase angle significantly increased in all the postgroups except in women in whom TBW decreased. Conclusions: The results suggest that bioelectrical impedance vector analysis is a suitable method to obtain a qualitative indication of body fluid changes during a competitive season in athletes.


Author(s):  
Leslie Verdeja-Vendrell ◽  
Dulce Gonzalez-Islas ◽  
Arturo Orea-Tejeda ◽  
Ana Grecia Navarrete-Penaloza ◽  
Rocio Sanchez-Santillan ◽  
...  

2020 ◽  
Vol 39 (2) ◽  
pp. 447-454 ◽  
Author(s):  
Elisabetta Marini ◽  
Francesco Campa ◽  
Roberto Buffa ◽  
Silvia Stagi ◽  
Catarina N. Matias ◽  
...  

Author(s):  
Priscila Custódio Martins ◽  
Luis Alberto Gobbo ◽  
Diego Augusto Santos Silva

Abstract Background Bioelectrical impedance vector analysis (BIVA) is able to identify differences in hydration status and body composition components, such as body cell mass (BCM) by means of plotting individuals in ellipses, when comparing groups with different characteristics. Objective Compare the confidence and tolerance ellipses of BIVA in individual and team sports athletes with a non-athlete reference population. Design and participants One hundred sixty-seven college athletes (team sports: 117 athletes, individual sports: 50 athletes) aged between 18 and 35 years. Bioelectrical impedance was used to measure resistance (R) and reactance (Xc) values that were used in the BIVA analysis to identify hydration status and BCM, respectively. Hotelling’s t-test was used to identify differences between groups in the confidence ellipses and the comparison was made with a non-athlete Italian reference population. Results There were no differences between male team sports and individual athletes (p = 0.151) and for female athletes (p = 0.624). Most athletes were located in the 50% tolerance ellipses, indicating adequate hydration. Compared to the Italian a non-athlete population, athletes of both sexes presented left impedance vector deviation in the minor axis (Xc) of the tolerance ellipses, indicating higher BCM. Conclusion There were no differences in BIVA between team and individual sports athletes, but most athletes presented an adequate hydration state and, compared to a non-athlete population, the athletes of the present study presented higher BCM.


2021 ◽  
Vol 11 (21) ◽  
pp. 9781
Author(s):  
Sandra de la Cruz Marcos ◽  
Mª Paz Redondo del Río ◽  
Beatriz de Mateo Silleras

The study of body composition (BC) allows evaluating nutritional status, optimizing competitive performance, and monitoring the success of training regimens in athletes. Since BC reference techniques are expensive and/or invasive, in practice simpler, less expensive, and safer methods such as anthropometry are often used. The problem is that anthropometry requires a qualified anthropometrist, a rigorous measurement protocol using validated equipment, and a lengthy procedure because of its limited accuracy. Bioimpedance analysis (BIA) is an indirect method for estimating BC in a simple, fast, inexpensive, noninvasive, accurate, and reproducible manner. Despite the limitations of conventional BIA, it is still the most commonly used method for assessing BC in athletes. However, bioelectrical impedance vector analysis (BIVA) allows qualitative assessment of body cell mass (BCM) and hydration status without the need for biological assumptions and without being subject to conventional BIA errors. The purpose of this article was to demonstrate the uses and applications of BIA in the study of the BC and physical characteristics of athletes. For example, several practical cases of athletes from different sports were compared. The results obtained from somatotype studies, conventional BIA, and BIVA were included. BIVA interpretation and somatotype were consistent for all cases analyzed, but BIVA also provided information about hydration and BCM. The application of BIVA in the assessment of athletes can improve BC studies in sports because it is fast, simple, and reliable and neither imposes two-compartment-model limitations on BC estimation nor requires any biological assumptions.


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