Cardiac repolarisation indices are associated with oxygen consumption during maximal exercise test in highly-trained cross-country skiers
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View abstract on PubMed
Summary
This summary is machine-generated.Vector electrocardiographic T-wave characteristics correlate with oxygen consumption (VO2) during exercise tests in elite skiers. Baseline T-wave data did not predict overall physical performance, but specific components showed associations near the anaerobic threshold.
Area Of Science
- Sports Medicine
- Cardiology
- Exercise Physiology
Background
- Cardiopulmonary exercise testing (CPET) is crucial for assessing cardiorespiratory fitness.
- Vector electrocardiography (VECG) offers advanced analysis of cardiac electrical activity.
- Understanding T-wave dynamics during exercise can provide insights into cardiac function and performance.
Purpose Of The Study
- To investigate the relationship between VECG T-wave characteristics and oxygen consumption (VO2) during maximal CPET.
- To determine if VECG T-wave parameters can predict physical performance in highly trained cross-country skiers.
- To analyze T-wave vector changes at different exercise intensities, including rest, anaerobic threshold, peak load, and recovery.
Main Methods
- Employed CPET on a bicycle ergospirometer with simultaneous VO2 and electrocardiogram (ECG) recording in 30 elite male cross-country skiers.
- Estimated anaerobic threshold using the respiratory exchange ratio and maximal oxygen consumption (VO2max/kg) for physical performance.
- Calculated VECG characteristics, including T-vector magnitude and components (Tx, Ty, Tz), using the Kors transformation procedure.
Main Results
- T-vector magnitudes (T-vector, Tx, Ty) were significantly associated with VO2/kg throughout the CPET (p < 0.010).
- Baseline T-vector characteristics did not correlate with maximal physical performance (VO2max/kg).
- At the stage preceding the anaerobic threshold (preAnT), Tx and T-vector amplitude showed significant associations with VO2max/kg (p = 0.039 and p = 0.023, respectively).
Conclusions
- VECG T-wave characteristics dynamically change during exercise and are linked to oxygen consumption levels in elite skiers.
- While not predictive of peak performance, specific T-wave vector components near the anaerobic threshold may offer insights into exercise intensity and physiological response.
- VECG analysis during CPET may serve as a valuable tool for monitoring cardiac function and training adaptations in athletes.
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