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Updated: Jun 18, 2025
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A Real-World High-Intensity Interval Training Protocol for Cardiorespiratory Fitness Improvement
Published on: February 22, 2022
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Acute Response of Different High-Intensity Interval Training Protocols on Cardiac Auto-Regulation Using Wearable
1Department of Sport and Leisure Studies, College of Physical Education, Keimyung University, Daegu 42601, Republic of Korea.
Sensors (Basel, Switzerland)
|July 27, 2024
Summary
Longer high-intensity interval training (HIIT) work intervals, even with the same work-to-rest ratio, significantly enhance cardiac auto-regulation and post-exercise hypotension, as measured by wearable devices.
Area of Science:
- Exercise Physiology
- Cardiovascular Health
- Wearable Technology
Background:
- High-intensity interval training (HIIT) is a popular exercise modality.
- Understanding the impact of different HIIT protocols on cardiac auto-regulation is crucial for optimizing training.
- Wearable devices offer a non-invasive method for monitoring physiological responses to exercise.
Purpose of the Study:
- To compare the effects of different HIIT protocols with varying work and rest durations on cardiac auto-regulation.
- To assess the influence of HIIT work-to-rest ratios on physiological responses using wearable technology.
- To investigate the impact of HIIT on post-exercise hypotension.
Main Methods:
- Randomized counter-balanced crossover study involving 13 physically active young males.
- Three HIIT protocols with identical work-to-rest ratios but different work/rest durations (10s/50s, 20s/100s, 40s/200s) were administered.
- Cardiac auto-regulation (HRV, vascular function) and post-exercise hypotension were measured using a wearable device.
Main Results:
- The 40s/200s HIIT protocol induced the most significant changes in R-R interval, ln low-frequency domain, ln high-frequency domain, and ln LF/HF ratio.
- Post-exercise hypotension was observed only in the 40s/200s protocol at 5 minutes post-exercise.
- Longer work intervals in HIIT protocols appear more effective for stimulating cardiac auto-regulation.
Conclusions:
- HIIT protocols with longer work durations, despite identical intensity and work-to-rest ratios, elicit a greater cardiac auto-regulatory response.
- Wearable devices can effectively monitor cardiac auto-regulation changes in response to varying HIIT protocols.
- Further research with 24-hour monitoring is recommended to fully understand the long-term effects of different HIIT protocols.
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