Dedication of Bioelectric Impedance Analysis(BIA)

Dedication of Bioelectric Impedance Analysis(BIA)

Charder has been committed to the research of BIA method for many years, applying the latest artificial neural network algorithm on bioelectrical impedance analysis to assess the body composition. The unique MA-BIA algorithm have been repeatedly verified by a large number of clinical experiments, providing the subject with more accurate and more valuable human body composition analysis results.

What is Bioelectrical Impedance Analysis (BIA)?

What is Bioelectrical Impedance Analysis (BIA) ?

Bioelectric Impedance Analysis(BIA) is a commonly used method for estimating body composition, and in particular body fat. It is a non-invasive, inexpensive, and portable method fit for a daily or routine clinical examination. Many of the early research studies showed that BIA was quite variable and it was not regarded by many as providing an accurate measure of body composition. In recent years technological improvements have made BIA a more reliable and therefore more acceptable way of measuring body composition.

Multi-frequency measurement

Multi-frequency measurement

Charder uses multiple frequency BIA technique to measure and analyze biological tissues which gives the most detailed and unique analysis results in the market. It is a wide spectrum of utilization of the result in the area of disease prognosis and monitoring of human vital status.

Unique Muscle Analysis Method and multi-measurement parameters

Charder for the study of BIA method was founded 15 years ago. After years of technical improvements, Charder unique muscle analysis method is able to precisely measure muscles of the trunk, upper limb and muscles of the lower limb.

Multi-measurement Parameters

  • Total and segmental lean mass analysis
  • Abdominal fat analysis - visceral fat and subcutaneous fat
  • Indicator of sarcopenia - Skeletal muscle index
  • Indicator of sarcopenia - Estimate Handgrip strength
  • Bioelectrical impedance vector analysis (BIVA)
  • PBF percentile for adults
Bioelectirc Impedance Vector Analysis


The bioelectric impedance vector analysis method (BIVA) is a novel approach to estimate the hydration status using height indexed resistance and reactance data (R-Xc graph) from bioimpedance measurements. BIVA represent a valuable, low-cost, non-invasive, objective, and rapid tool to complement the clinical evaluation and follow-up of the patient through detection of body composition changes, muscle and nutritional status of these patients. BIVA provides additional prognostic information about mortality from all causes.

Phase angle and health determinants

The phase angle (PA) has been used as a prognostic marker in several clinical situations. Existing rigorous and large-scale medical studies have pointed out that the higher PA in bioimpedance analysis not only represents good exercise training, in fact; higher PA can also represent physiological indicators of healthy cell function and good health, therefore Charder body composition analyzers consider PA as a standard parameter, so as to assess the health of the subject in a more objective and clinically manner.

Phase angle and health determinants

High Correlation with DEXA

After years of dedication to Bioelectrical Impedance Analysis(BIA) research, we have invested in relevant research for many years and cooperated with many colleges and universities and research institutes and have rich clinical experiment results. Our MA-BIA measurement has been clinically proven, the accuracy and repetitiveness have a positive correlation coefficient of 95% with DEXA.

Body Composition Analyzer

Validation Studies

  • KC Hsieh, JJ Chao, CS Wu, HK Lu. Discrepancy BMD between Taiwan First Division Football League players and healthy men by DXA. Journal of Strength Conditioning Research, June 2017, Submitted. (SCI)
  • CS Wu, YY Chen, LC Lee, KH Lu, JJ Chao, KC Hsieh*. The validation of bioelectrical impedance analysis system in evaluating segmental body composition in soccer players, Journal of Exercise Science & Fitness, August 2017, Under review. (SCI)
  • YS Liao, HC Li, LW Lee, YL Kuo, HK Lu, CL Lai, YS Wang, KC Hsieh. Validation of a portable eight‐electrode multi‐frequency bioelectrical impedance analysis using dual‐energy X‐ray absorptiometry as a reference. Aug 2017, Clinical Nutrition, Under review. (SCI)
  • KT Chen, YY Chen, CL Chuang, HK Lu, LM Chiang, CL Lai, KM Casebolt, AC, WL Lin, Huang, KC Hsieh*. Discrepancies between leg‐to‐leg bioelectrical impedance analysis and computerized tomography in abdominal visceral fat measurement. Scientific reports, 2017, 7(1):9102. (SCI)
  • LW Lee, YS Liao, HK Lu, PL Hsiao, YY Chen, CC Chi, KC Hsieh*. Validation of two portable bioelectrical impedance analyses for the assessment of body composition in school age children. PLOS One, 2017, 12(2), e0171568. (SCI)
  • MF Chen, YY Chen, TR Jang, WL Lin, J Chen, KC Hsieh*. Total body composition Estimated by a standing‐posture 8‐electrode bioelectrical impedance analysis in young Taiwanese male wrestlers, Biology of Sport, Dec 2016; 33:399‐405. (SCI)
  • AC Huang, YY Chen, CL Chuang, LM Chiang, HK Lu, HC Lin, KT Chen, AC Hsiao, KC Hsieh*. Cross‐mode bioelectrical impedance analysis in a standing position for estimating fat free mass validated against dual‐energy X‐ray absorptiometry. Nutrition Research, 2015; 35: 982‐989. (SCI)