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Updated: Jan 19, 2026
A Real-World High-Intensity Interval Training Protocol for Cardiorespiratory Fitness Improvement
Published on: February 22, 2022
Kinematic alterations after two high-intensity intermittent training protocols in endurance runners
Felipe García-Pinillos1, Alejandro Molina-Molina2, Juan A Párraga-Montilla1
1Department of Corporal Expression, University of Jaen, Jaen 23071, Spain.
High-intensity intermittent training (HIIT) did not significantly alter running kinematics in trained athletes, even at high exertion levels. Different HIIT protocols with similar loads but varying paces showed distinct kinematic patterns, but not fatigue-induced changes.
Area of Science:
- Sports Science
- Exercise Physiology
- Biomechanics
Background:
- High-intensity intermittent training (HIIT) is a popular training method for endurance athletes.
- Understanding the kinematic changes during HIIT is crucial for optimizing performance and preventing injuries.
- Previous research has not fully elucidated the kinematic responses to different HIIT protocols with similar external loads.
Purpose of the Study:
- To evaluate running kinematic characteristics during early and late stages of two HIIT protocols with similar external loads but different average running paces.
- To compare fatigue-induced kinematic changes between these two HIIT protocols.
Main Methods:
- Eighteen endurance runners participated in two HIIT protocols: 10x400m and 40x100m runs.
- Kinematic data (spatial-temporal parameters, joint angles, foot strike) were collected using high-speed cameras.
- Physiological measures included heart rate, blood lactate, and rate of perceived exertion.
Main Results:
- Both HIIT protocols induced high levels of exhaustion in athletes.
- No significant changes in running kinematics were observed within either protocol from the first to the last run.
- Differences in running pace between protocols affected kinematics, including step and flight times, and joint angles.
Conclusions:
- HIIT sessions of 15-90 seconds at intensities above velocity associated with maximal oxygen uptake did not consistently alter running kinematics in trained endurance runners.
- Running speed is a key factor influencing kinematic patterns during HIIT.
- Fatigue did not significantly perturb running kinematics within these specific HIIT protocols.
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