Automatic recording of biological impedances.
An automatic recording system for measurements of biological impedances at different frequencies is described. The system comprises a signal synthesizer and a network analyser controlled by a desk calculator. The impedance and phase angle are recorded at one hundred and sixty logarithmically-spaced frequencies between 100 Hz and 1 MHz. A pilot study was conducted to explore the usefulness of the system for investigating fluid balance problems.
D001698:Biomedical Engineering; D004582:Electronics, Medical / Q000295:instrumentation*; D006801:Humans; D008991:Monitoring, Physiologic / Q000295:instrumentation*; D014882:Water-Electrolyte Balance