000108303 001__ 108303
000108303 005__ 20230519145350.0
000108303 0247_ $$2doi$$a10.1111/sms.13849
000108303 0248_ $$2sideral$$a121141
000108303 037__ $$aART-2021-121141
000108303 041__ $$aeng
000108303 100__ $$0(orcid)0000-0002-7842-9611$$aMilagro, J.
000108303 245__ $$aEstimation of the second ventilatory threshold through ventricular repolarization profile analysis
000108303 260__ $$c2021
000108303 5060_ $$aAccess copy available to the general public$$fUnrestricted
000108303 5203_ $$aUnder the hypothesis that sympathetic control of ventricular repolarization may change once the second ventilatory threshold (VT2) has been reached, a novel methodology for non-invasive VT2 estimation based on the analysis of the T wave from the electrocardiogram (ECG) is proposed, and potential underlying physiological mechanisms are suggested. 25 volunteers (33.4 ± 5.2 years) underwent an incremental power cycle ergometer test (25 W/minute). During the test, respiratory gas exchange and multi-lead ECG were acquired. The former was employed to determine VT2, used here as a reference, whereas the latter was used to compute the temporal profiles of an index of ventricular repolarization instability (dT) and its low-frequency (LF) oscillations (LFdT). The sudden increases observed in dT and LFdT profiles above an established heart rate threshold were employed to derive VT2 estimates, referred to as VT2dT and VT2LFdT, respectively. Estimation errors of -4.7 ± 25.2 W were obtained when considering VT2dT. Errors were lower than the one-minute power increment of 25 W in 68% of the subjects and lower than 50 W in 89.5% of them. When using VT2LFdT, estimation error was of 15.3 ± 32.4 W. Most of the subjects shared common characteristic dT and LFdT profiles, which could be reflecting changes in the autonomic control of ventricular repolarization before and after reaching VT2. The analysis of ventricular repolarization dynamics during exercise allows non-invasive ECG-based estimation of VT2, possibly in relation to changes in the autonomic control of ventricular electrical activity when VT2 is reached.
000108303 536__ $$9info:eu-repo/grantAgreement/ES/DGA-FSE/LMP124-18$$9info:eu-repo/grantAgreement/ES/DGA-FSE/LMP44-18$$9info:eu-repo/grantAgreement/ES/DGA-FSE/T39-20R-BSICoS group$$9info:eu-repo/grantAgreement/EUR/ERC-2014-StG-638284$$9info:eu-repo/grantAgreement/ES/MECD/FPU16-05879$$9info:eu-repo/grantAgreement/ES/MINECO/BES-2015-073694$$9info:eu-repo/grantAgreement/ES/MINECO-FEDER/RTI2018-097723-B-I00$$9info:eu-repo/grantAgreement/ES/MINECO/PID2019-105674RB-I00
000108303 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/
000108303 590__ $$a4.645$$b2021
000108303 591__ $$aSPORT SCIENCES$$b14 / 88 = 0.159$$c2021$$dQ1$$eT1
000108303 594__ $$a7.6$$b2021
000108303 592__ $$a1.383$$b2021
000108303 593__ $$aPhysical Therapy, Sports Therapy and Rehabilitation$$c2021$$dQ1
000108303 593__ $$aOrthopedics and Sports Medicine$$c2021$$dQ1
000108303 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion
000108303 700__ $$0(orcid)0000-0001-6025-5070$$aHernández-Vicente, A.$$uUniversidad de Zaragoza
000108303 700__ $$0(orcid)0000-0002-1462-4880$$aHernando, D.
000108303 700__ $$0(orcid)0000-0002-7215-6931$$aCasajús, J.A.$$uUniversidad de Zaragoza
000108303 700__ $$0(orcid)0000-0001-8374-9081$$aGaratachea, N.$$uUniversidad de Zaragoza
000108303 700__ $$0(orcid)0000-0003-1272-0550$$aBailón, R.$$uUniversidad de Zaragoza
000108303 700__ $$0(orcid)0000-0002-1960-407X$$aPueyo, E.$$uUniversidad de Zaragoza
000108303 7102_ $$11006$$2245$$aUniversidad de Zaragoza$$bDpto. Fisiatría y Enfermería$$cÁrea Educación Física y Depor.
000108303 7102_ $$15008$$2800$$aUniversidad de Zaragoza$$bDpto. Ingeniería Electrón.Com.$$cÁrea Teoría Señal y Comunicac.
000108303 773__ $$g31, 2 (2021), 339-349$$pScand. j. med. sci. sports$$tScandinavian Journal of Medicine and Science in Sports$$x0905-7188
000108303 8564_ $$s820488$$uhttps://zaguan.unizar.es/record/108303/files/texto_completo.pdf$$yPostprint
000108303 8564_ $$s2286839$$uhttps://zaguan.unizar.es/record/108303/files/texto_completo.jpg?subformat=icon$$xicon$$yPostprint
000108303 909CO $$ooai:zaguan.unizar.es:108303$$particulos$$pdriver
000108303 951__ $$a2023-05-18-13:26:13
000108303 980__ $$aARTICLE