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The interval estimate of any variable is known as the prediction interval. It helps decide if a point estimate is dependable.
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Related Experiment Video

Updated: Jan 21, 2026

Impact of High-intensity Interval Exercise and Moderate-Intensity Continuous Exercise on the Cardiac Troponin T Level at an Early Stage of Training
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High intensity interval training after cardiac resynchronization therapy: An explorative randomized controlled trial.

Ruud F Spee1, Victor M Niemeijer2, Thijs Schoots2

  • 1Cardiology Department, Máxima Medical Center Veldhoven, the Netherlands; ICIN, Netherlands Heart Institute, Utrecht, the Netherlands.

International Journal of Cardiology
|July 30, 2019
PubMed
Summary

High-intensity interval training (HIT) added to cardiac resynchronization therapy (CRT) improves exercise capacity in heart failure patients. This enhancement is linked to better anaerobic performance, not peak oxygen uptake.

Keywords:
Cardiac resynchronization therapyChronic heart failureExercise capacityHigh intensity interval training

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Area of Science:

  • Cardiology
  • Exercise Physiology
  • Heart Failure Management

Background:

  • Cardiac resynchronization therapy (CRT) improves outcomes in select heart failure (HF) patients.
  • Combining CRT with moderate exercise training enhances exercise capacity.
  • The role of high-intensity interval training (HIT) as an adjunct to CRT is not well-established.

Purpose of the Study:

  • To investigate the additional effects of HIT on exercise capacity when combined with CRT.
  • To test the hypothesis that HIT may further improve exercise capacity in CRT patients due to complementary physiological effects.

Main Methods:

  • 24 NYHA class II/III HF patients undergoing CRT were assessed for echocardiogram, QoL, and cardiopulmonary exercise testing (CPET).
  • After 3 months post-CRT, patients were randomized to usual care or HIT (36 sessions at 85-95% peak V̇O₂).
  • Measurements were taken pre-implantation, and at 3 and 6 months post-implantation.

Main Results:

  • CRT improved peak V̇O₂ and workload. HIT further increased peak workload significantly in the intervention group.
  • Peak cardiac output (CO) and left ventricular ejection fraction (LVEF) did not change significantly with HIT.
  • V̇O₂ recovery kinetics improved post-CRT, with no additional benefit from HIT.

Conclusions:

  • High-intensity interval training (HIT) offers additional improvements in exercise capacity for CRT patients.
  • The benefits of HIT appear to stem from enhanced anaerobic performance rather than increased peak oxygen uptake or cardiac output.