Errors in prolonged electrical impedance measurements due to electrode repositioning and postural changes

Albert Lozano-Nieto, J. Rosell, R. Pallas-Areny

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Long-term electrical impedance measurements are affected by specific errors. Electrode failure, changes in its impedance due to aging, and postural changes are among the most important. The authors analyse errors due to electrode replacement and body postural changes. Electrode replacement errors can cause impedance changes up to 5% of basal value. This is one of the most important factors in data reproducibility. Body postural changes also contribute to impedance variations. The authors have proposed the use of a reference position to carry out impedance measurements as the one that shows the smallest impedance sensitivity to postural changes. In general, the authors observed that this is achieved with arms and legs slightly separated from the body. They propose the use of a ratio of impedance at two different frequencies to discern the origin of impedance changes, whether from physiological phenomena or postural errors.

Original languageEnglish (US)
Article number004
Pages (from-to)121-130
Number of pages10
JournalPhysiological Measurement
Volume16
Issue number2
DOIs
StatePublished - 1995

Fingerprint

Acoustic impedance
Electric Impedance
Electrodes
Aging of materials
Physiological Phenomena
Leg
Arm

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Physiology
  • Physiology (medical)

Cite this

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abstract = "Long-term electrical impedance measurements are affected by specific errors. Electrode failure, changes in its impedance due to aging, and postural changes are among the most important. The authors analyse errors due to electrode replacement and body postural changes. Electrode replacement errors can cause impedance changes up to 5{\%} of basal value. This is one of the most important factors in data reproducibility. Body postural changes also contribute to impedance variations. The authors have proposed the use of a reference position to carry out impedance measurements as the one that shows the smallest impedance sensitivity to postural changes. In general, the authors observed that this is achieved with arms and legs slightly separated from the body. They propose the use of a ratio of impedance at two different frequencies to discern the origin of impedance changes, whether from physiological phenomena or postural errors.",
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Errors in prolonged electrical impedance measurements due to electrode repositioning and postural changes. / Lozano-Nieto, Albert; Rosell, J.; Pallas-Areny, R.

In: Physiological Measurement, Vol. 16, No. 2, 004, 1995, p. 121-130.

Research output: Contribution to journalArticle

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