Bioelectrical impedance vector analysis and phase angle in boys with Duchenne muscular dystrophy

  • Karina M. Vermeulen
  • Márcia M.G.D. Lopes
  • Evellyn C. Grilo
  • Camila X. Alves
  • Richele J.A. Machado
  • Lucia L. Lais
  • José Brandão-Neto
  • Sancha H.L. Vale
Keywords: Duchenne muscular dystrophy, phase angle, bioelectrical impedance vector analysis, body composition, lean mass


Background: Duchenne muscular dystrophy (DMD) is a disease characterized by progressive loss of functional muscle mass followed by changes in body composition.

Objective: This study aimed to describe and evaluate bioimpedance parameters in boys with DMD. Design: This cross-sectional, descriptive study investigated children and adolescents diagnosed with DMD. Age, weight, height, resistance, and reactance data were collected. Phase angle and bioelectrical impedance vector analysis were calculated based on resistance and reactance values.

Results: We analyzed 43 boys aged between 2.7 and 19.8 years. Low-phase angle values were observed during the investigation of bioimpedance parameters. Bioelectrical impedance vector analysis showed that approximately 87% of the subjects presented vectors outside the tolerance ellipses, and only one patient presented vectors located within the 50% tolerance ellipse, indicating normally hydrated and a good body cell mass. Compared with the reference population, boys with DMD had lower levels of body cell mass.

Conclusion: Based on the evidence, compared with the reference population, patients with DMD had lower levels of body cell mass. This evidence points to bioimpedance parameters as useful tools for the nutritional evaluation and clinical management of patients with DMD.


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How to Cite
Vermeulen, K. M., Lopes, M. M., Grilo, E. C., Alves, C. X., Machado, R. J., Lais, L. L., Brandão-Neto, J., & Vale, S. H. (2019). Bioelectrical impedance vector analysis and phase angle in boys with Duchenne muscular dystrophy. Food & Nutrition Research, 63.
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