This study evaluated the potential of using smartphone-acquired seismocardiographic (SCG) signals for monitoring cardiac deconditioning after prolonged bed rest (BR). Ten healthy volunteers were enrolled in a 10-day BR. By positioning a smartphone on subject's chest, 1-minute SCG was acquired before the BR (PRE), on the 10th day of BR (BR10), and one day after reambulation (R+1). Signals were pre-processed and automatic beat identification was performed. Heart rate and variability indices (SDAO-AO, RMSSD, SDAO-AO/RMSSD) were calculated. Isovolumetric contraction (IVC), aortic valve opening (AO) and closure (AC) points were identified on the SCG, from which amplitude difference (AMPAO-IVC) and slope were derived. Finally, linear (iKlin) and rotational (iKrot) kinetic energies were calculated. At BR10 sympathetic modulation at awakening increased. Also, SCG morphology was affected, with increased AMPAO-IVC and IVC-AO slope. Further, at BR10 changes in morphology recovered, while iKlin/iKrot ratio increased. These findings support smartphones' potential as portable and non-invasive cardiac health monitoring devices for cardiac deconditioning.

Assessing Cardiac Electro-Mechanical Deconditioning during Bed Rest Using Smartphone's Inertial Sensors

Solbiati S.;Paglialonga A.;Caiani E. G.
2021

Abstract

This study evaluated the potential of using smartphone-acquired seismocardiographic (SCG) signals for monitoring cardiac deconditioning after prolonged bed rest (BR). Ten healthy volunteers were enrolled in a 10-day BR. By positioning a smartphone on subject's chest, 1-minute SCG was acquired before the BR (PRE), on the 10th day of BR (BR10), and one day after reambulation (R+1). Signals were pre-processed and automatic beat identification was performed. Heart rate and variability indices (SDAO-AO, RMSSD, SDAO-AO/RMSSD) were calculated. Isovolumetric contraction (IVC), aortic valve opening (AO) and closure (AC) points were identified on the SCG, from which amplitude difference (AMPAO-IVC) and slope were derived. Finally, linear (iKlin) and rotational (iKrot) kinetic energies were calculated. At BR10 sympathetic modulation at awakening increased. Also, SCG morphology was affected, with increased AMPAO-IVC and IVC-AO slope. Further, at BR10 changes in morphology recovered, while iKlin/iKrot ratio increased. These findings support smartphones' potential as portable and non-invasive cardiac health monitoring devices for cardiac deconditioning.
Computing in Cardiology
978-1-6654-7916-5
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/1217037
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 0
  • ???jsp.display-item.citation.isi??? ND
social impact