Related Experiment Videos
Ventilation and heart rate response during exercise in normals: relevance for rate variable pacing
N Treese1, D MacCarter, O Akbulut
1II. Medizinische Klinik, Johannes Gutenberg University Mainz, Germany.
Pacing and Clinical Electrophysiology : PACE
|August 1, 1993
Summary
The study reveals that while heart rate (HR) correlates with oxygen uptake (VO2) and ventilation (VE), the anaerobic threshold (AT) significantly alters these relationships. HR increases more with VO2 than VE post-AT.
Area of Science:
- Cardiopulmonary Exercise Physiology
- Sports Medicine
- Clinical Exercise Testing
Background:
- Heart rate (HR) and oxygen uptake (VO2) relationships are valuable for rate-variable pacing.
- The influence of the anaerobic threshold (AT) on HR-VO2 and HR-VE slopes is less understood.
Purpose of the Study:
- To investigate the impact of anaerobic threshold (AT) on the linearity of heart rate-oxygen uptake (HR-VO2) and heart rate-minute ventilation (HR-VE) relationships during exercise.
Main Methods:
- Utilized semisupine bicycle exercise testing with respiratory gas exchange analysis in 39 subjects without major cardiopulmonary disease.
- Determined anaerobic threshold (AT) using the V-slope method during a ramped work rate protocol.
Main Results:
- High correlations (r ≥ 0.9) were observed between HR, VO2, and minute ventilation (VE).
- Linearity for HR-VO2 was found in 16/39 subjects and for HR-VE in 11/39 subjects.
- Post-AT, HR increased more relative to VO2 (slopes: 3.2 vs. 2.6 in men, P<0.05) but less relative to VE (slopes: 1.0 vs. 1.6 in men, P<0.05).
Conclusions:
- The anaerobic threshold acts as a breakpoint, altering the linear relationship between HR, VO2, and VE.
- Exercise intensity relative to AT influences the differing slopes of HR-VO2 and HR-VE, impacting pacing strategies.