Variability of the maximal amplitudes of impedance cardiogram and of its first derivative during supine, standing, paced breathing, and exercise maneuvers

@article{CarrascoSosa2014VariabilityOT,
  title={Variability of the maximal amplitudes of impedance cardiogram and of its first derivative during supine, standing, paced breathing, and exercise maneuvers},
  author={Salvador Carrasco-Sosa and Alejandra Guill{\'e}n-Mandujano},
  journal={Computing in Cardiology 2014},
  year={2014},
  pages={1065-1068}
}
Beat-to-beat variability of the maximal amplitudes of thoracic impedance (ΔZ<sub>max</sub>) and of its first derivative (dZ/dt<sub>max</sub>) remain unexplored. We examined the effects of four maneuvers eliciting different sympathetic activity levels on ΔZ<sub>max</sub> and dZ/dt<sub>max</sub> time-frequency spectral measures. Seventeen healthy subjects performed 5-min maneuvers: lying, controlled breathing, standing (S) and exercise (E). Time-frequency spectra of RR intervals (RR), ΔZ<sub>max… CONTINUE READING