Lack of agreement of in vivo raw bioimpedance measurements obtained from two single and multi-frequency bioelectrical impedance devices
Open accessAbstract
Background It is important for highly active individuals to accurately assess their hydration level. Bioelectrical impedance (BIA) can potentially meet these needs but its validity in active individuals is not well established.Methods We compared whole-body bioimpedance measurements obtained from multi-frequency bioelectrical impedance spectroscopy (BIS, Xitron 4200) at a 50 kHz frequency with those determined by a phase-sensitive single-frequency device (SF-BIA, BIA-101, RJL/Akern Systems) in two populations: active adults and elite athletes.Results One hundred twenty-six participants, including active males involved in recreational sports (N = 25, 20-39 yr) and elite athletes (females: N = 26, 18-35 yr; males: N = 75, 18-38 yr) participated in this study. Reactance (Xc), Resistance (R), Impedance (Z), and phase angle (PhA) were obtained by BIS and SF-BIA. Small but significant differences (R: -9.91 ± 15.09 Ω; Xc: -0.97 ± 2.56 Ω; Z: -9.96 ± 15.18 Ω; PhA: 0.12 ± 0.2°) were observed between the bioimpedance equipment in all measured variables (p < 0.05) though differences were within the devices' technical error of measurements. Device-specific values were highly (p < 0.0001) correlated [R 2 ranged from 0.881 (Xc) to 0.833 (R)], but slopes and intercepts were different (p < 0.0001) from 1 and 0, respectively. Relatively large limits of agreement were observed for R (-40 to 21 Ω), Xc (-6 to 4 Ω), PhA (-0.4 to 0.5°), and impedance (-40 to 20 Ω).Conclusion Bioimpedance measurements from the current single- and multi-frequency devices should not be used interchangeably. The of lack of agreement between devices was observed in determining individual values of R, Xc, Z and PhA of highly active populations possibly due to methodological and biological factors.
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There is a lack of agreement between bioelectrical values obtained at different frequencies.
“considering the lack of agreement between bioelectrical values obtained at different frequencies [21, 107]”
From High-standard predictive equations for estimating body composition using bioelectrical impedance analysis: a systematic review (2024) · cites this paper as [107]
The Discussion (p. 11) reports a lack of agreement between two devices in a highly active population, but specifies that their values were compared at the same frequency, 50 kHz. The paper does not establish a lack of agreement between values obtained at different frequencies. (LLM, conf=0.89)
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References 36 · Cited by 99
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- Authors
- Silva, A. M., Matias, C. N., Nunes, C. L., Santos, D. A., Marini, E., Lukaski, H. C., & Sardinha, L. B.
- Affiliations
- University of Lisbon (PT)
- University of Cagliari (IT)
- University of North Dakota (US)
- Corresponding author
- Silva, Analiza M.
- ORCID
- Venue
- European Journal of Clinical Nutrition
- Published
- 2018-10-22
- Volume
- 73
- Issue
- 7
- Pages
- 1077-1083
- ISSN
- 0954-3007 (ISSN-L)
- 1476-5640
- OpenAlex
- W2897420011
- Cited by
- 99
- References
- 36
- Citations by year
- 2026: 6 · 2025: 11 · 2024: 13 · 2023: 10 · 2022: 15 · 2021: 20 · 2020: 12 · 2019: 11 · 2018: 1
- FWCI
- 7.54
- Type
- journal article
- Language
- en
- Open access
- green
- hdl.handle.net
- Licence
- other-oa
- www.springer.com/tdm (tdm)
- Locations
- European Journal of Clinical Nutrition (publishedVersion)
- PubMed (publishedVersion)
- UNICA IRIS Institutional Research Information System (University of Cagliari) (submittedVersion, other-oa)
- UNICA IRIS Institutional Research Information System (University of Cagliari) (submittedVersion)
- Funders
- Ministry of Education and Science | Fundação para a Ciência e a Tecnologia (PTDC/DES/69495/2006, PTDC/DES/098963/2008, SFRH/BPD/92462/2013)
- Topics
- Health Sciences › Medicine › Physiology › Body Composition Measurement Techniques
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Electrical and Bioimpedance Tomography
- Health Sciences › Medicine › Surgery › Hemodynamic Monitoring and Therapy
- Keywords
- bioimpedance, bioimpedance spectroscopy, hydration status, device agreement, elite athletes, physically active adults, body resistance, reactance, phase angle, measurement error
- MeSH terms
- Adolescent, Adult, Dehydration, Equipment Design, Female, Humans, Male, Reproducibility of Results, Electric Impedance, Young Adult, Athletes
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