Purpose: A decrease of electrocardiographic T-wave voltage with increasing training loads has been reported in elite endurance athletes and ascribed to training-related adaptation in sympathetic activity to the ventricles. A switch from vagal to sympathetic predominance in sino-atrial node regulation on going from low to peak training load has been reported in world-class rowers. In this study on world-class endurance athletes, we tested the hypothesis that training-induced variations in T-wave amplitude at higher training loads are paralleled by changes in HR spectral profile. Methods: We studied eight male rowers of the Italian national team in the season culminating with the Rowing World Championship. Athletes were evaluated at 50 and 100% of training load, similar to 20 d before the World Championship, and during the World Championship, when the intensity was markedly reduced. We assessed T-wave maximum amplitude in chest lead V6 and cardiac autonomic regulation by power spectral analysis of R-R interval variability. Results: The increase in training load from 50 to 100% was accompanied by a significant decrease in high frequency and a significant increase in low-frequency R-R variability (in normalized units) with a concomitant significant decrease in T-wave amplitude (muV). Reduction in training load during the World Championship resulted in a return of spectral profile to the level observed at 50% training load and in a partial recovery of T-wave amplitude. HR did not change significantly. Conclusions: In high-performance world-class athletes, training load simultaneously affects both ventricular repolarization and HR variability patterns possibly through variations in cardiac sympathetic modulation to the ventricles and the sino-atrial node. Information on concomitant changes in ventricular repolarization and autonomic cardiac regulation might be employed to tailor training protocols of elite athletes.
Iellamo F., P.F. (2004). T-wave and heart rate variability changes to assess training in world-class athletes. MEDICINE AND SCIENCE IN SPORTS AND EXERCISE, 36(8), 1342-1346.
|Tipologia:||Articolo su rivista|
|Citazione:||Iellamo F., P.F. (2004). T-wave and heart rate variability changes to assess training in world-class athletes. MEDICINE AND SCIENCE IN SPORTS AND EXERCISE, 36(8), 1342-1346.|
|IF:||Con Impact Factor ISI|
|Settore Scientifico Disciplinare:||Settore MED/09 - Medicina Interna|
|Revisione (peer review):||Sì, ma tipo non specificato|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1249/01.MSS.0000135796.75091.8A|
|Stato di pubblicazione:||Pubblicato|
|Data di pubblicazione:||2004|
|Titolo:||T-wave and heart rate variability changes to assess training in world-class athletes|
|Autori:||Iellamo F., Pigozzi F., Spataro A., Lucini D., Pagani M.|
|Appare nelle tipologie:||01 - Articolo su rivista|