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Updated: May 10, 2026
08:27
A Real-World High-Intensity Interval Training Protocol for Cardiorespiratory Fitness Improvement
Published on: February 22, 2022
Cardiorespiratory response to aerobic exercise programs with different intensity: 20 weeks longitudinal study
Sandip Meghnad Hulke1, Mrunal S Phatak, Yuganti P Vaidya
1Department of physiology, Laxminarayan Medical College and Research Centre, Bhopal, India.
Summary
Intensive exercise training for 20 weeks significantly improves cardio-respiratory health, including aerobic power and lung function. Higher intensity exercise yields greater benefits for athletes and students.
Area of Science:
- Exercise Physiology
- Cardiovascular Adaptations
- Pulmonary Medicine
Background:
- Regular intensive exercise leads to increased left ventricular (LV) wall thickness and cavity size.
- The extent of these cardiac adaptations is influenced by exercise frequency, intensity, type, and duration.
Purpose of the Study:
- To investigate the effects of sports training on LV morphology and function.
- To assess the impact on lung function.
- To determine the exercise intensity required for significant physiological changes.
Main Methods:
- A 20-week longitudinal study involving medical college students.
- Three groups: high-intensity (HG), low-intensity (LG), and no-exercise (NG) control group.
- Echocardiography and pulmonary function tests were conducted at baseline, 10 weeks, and 20 weeks.
Main Results:
- The high-intensity group (HG) showed significant improvements in most cardio-respiratory parameters (VO2max, heart rate, LVIDD, LVIDS, EDV, MVV, PEFR, FVC) compared to the low-intensity group (LG).
- Improvements were particularly notable by the 20th week of training.
- LG also demonstrated improvements in VO2max, heart rate, MVV, and PEFR.
Conclusions:
- Twenty weeks of moderate to high-intensity exercise training enhances aerobic power, maximal voluntary ventilation (MVV), and peak expiratory flow rate (PEFR).
- For comprehensive cardio-respiratory development, very high-intensity exercise is recommended, especially with shorter training durations.
Keywords:
ejection fraction %end diastolic volumeforced vital capacity.left ventricular Internal diameter at end-diastoleleft ventricular Internal diameter at end-systolemaximum voluntary ventilationpeak expiratory flow rateMore Related Videos
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