Estimation of the second ventilatory threshold through ventricular repolarization profile analysis

Milagro, J. ; Hernández-Vicente, A. (Universidad de Zaragoza) ; Hernando, D. ; Casajús, J.A. (Universidad de Zaragoza) ; Garatachea, N. (Universidad de Zaragoza) ; Bailón, R. (Universidad de Zaragoza) ; Pueyo, E. (Universidad de Zaragoza)

Resumen: Under 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.

Idioma: Inglés

DOI: 10.1111/sms.13849

Año: 2021

Publicado en: Scandinavian Journal of Medicine and Science in Sports 31, 2 (2021), 339-349
ISSN: 0905-7188

Factor impacto JCR: 4.645 (2021)

Categ. JCR: SPORT SCIENCES rank: 14 / 88 = 0.159 (2021) - Q1 - T1

Factor impacto CITESCORE: 7.6 - Health Professions (Q1) - Medicine (Q1)

Factor impacto SCIMAGO: 1.383 - Physical Therapy, Sports Therapy and Rehabilitation (Q1) - Orthopedics and Sports Medicine (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA-FSE/LMP124-18
Financiación: info:eu-repo/grantAgreement/ES/DGA-FSE/LMP44-18
Financiación: info:eu-repo/grantAgreement/ES/DGA-FSE/T39-20R-BSICoS group
Financiación: info:eu-repo/grantAgreement/EUR/ERC-2014-StG-638284
Financiación: info:eu-repo/grantAgreement/ES/MECD/FPU16-05879
Financiación: info:eu-repo/grantAgreement/ES/MINECO/BES-2015-073694
Financiación: info:eu-repo/grantAgreement/ES/MINECO-FEDER/RTI2018-097723-B-I00
Financiación: info:eu-repo/grantAgreement/ES/MINECO/PID2019-105674RB-I00

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Educación Física y Depor. (Dpto. Fisiatría y Enfermería)
Área (Departamento): Área Teoría Señal y Comunicac. (Dpto. Ingeniería Electrón.Com.)