000075904 001__ 75904
000075904 005__ 20190111130514.0
000075904 0248_ $$2sideral$$a108507
000075904 037__ $$aART-2012-108507
000075904 041__ $$aeng
000075904 100__ $$aPellegrini, A.
000075904 245__ $$aSelective beat averaging to evaluate ventricular repolarization adaptation to deconditioning after 5 days of head-down bed rest
000075904 260__ $$c2012
000075904 5060_ $$aAccess copy available to the general public$$fUnrestricted
000075904 5203_ $$aThe study of QT/RR relationship is important for the clinical evaluation of possible risk of ventricular tachyarrhythmia. Our aim was to assess the effects of 5-days of head-down (-6 degrees) bed-rest (HDBR) on ventricular repolarization. High fidelity 12-leads Holter ECG was acquired before (PRE), the last day of HDBR (HDT5), and five days after its conclusion (POST). X, Y, Z leads were derived (inverse Dower matrix) and vectorcardiogram computed. Selective beat averaging applied to the night period resulted in averages preceded by the same stable heart rate (for each 10 msec bin amplitude, in the range 900-1200 msec). For each template (i.e., one for each bin), T-wave maximum amplitude (Tmax), T wave area, R-Tapex and R-Tend were computed. Results (in 8 male volunteers) showed that, compared to PRE, at HDT5 both R-Tapex and R-Tend resulted significantly shortened (-5% and -3%, respectively), together with a decrease in T-wave area (-7%), while Tmax was unchanged. At POST, duration parameters showed a trend towards their control values (-1.5% and -3%, respectively) while amplitude parameters resulted restored. Despite the short-term BR, cardiac adaptation to deconditioning affected ventricular repolarization during the night period. © 2012 CCAL.
000075904 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttp://creativecommons.org/licenses/by/3.0/es/
000075904 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000075904 700__ $$0(orcid)0000-0003-4068-127X$$aBolea, J.
000075904 700__ $$aLlamedo Soria, M.
000075904 700__ $$aSotaquira, M.
000075904 700__ $$0(orcid)0000-0001-7755-5002$$aAlmeida, R.
000075904 700__ $$0(orcid)0000-0003-3434-9254$$aLaguna, P.$$uUniversidad de Zaragoza
000075904 700__ $$aVaïda, P.
000075904 700__ $$aCaiani, E.G.
000075904 7102_ $$15008$$2800$$aUniversidad de Zaragoza$$bDpto. Ingeniería Electrón.Com.$$cÁrea Teoría Señal y Comunicac.
000075904 773__ $$g39 (2012), 605-608$$pComput. cardiol.$$tComputing in Cardiology$$x2325-8861
000075904 85641 $$uhttps://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6420466$$zTexto completo de la revista
000075904 8564_ $$s166922$$uhttps://zaguan.unizar.es/record/75904/files/texto_completo.pdf$$yVersión publicada
000075904 8564_ $$s106662$$uhttps://zaguan.unizar.es/record/75904/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000075904 909CO $$ooai:zaguan.unizar.es:75904$$particulos$$pdriver
000075904 951__ $$a2019-01-11-13:02:39
000075904 980__ $$aARTICLE