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Updated: Jun 22, 2025

A Real-World High-Intensity Interval Training Protocol for Cardiorespiratory Fitness Improvement
Published on: February 22, 2022
A training goal-oriented categorization model of high-intensity interval training.
Thomas L Stöggl1,2, Tilmann Strepp1, Hans-Peter Wiesinger1,3,4
1Department of Sport and Exercise Science, Paris Lodron University Salzburg, Salzburg, Austria.
This review proposes a new, goal-oriented categorization model for high-intensity interval training (HIIT), defining six types based on interval duration, intensity, and recovery. This framework aims to standardize HIIT research and guide training for athletes.
Area of Science:
- Exercise Physiology
- Sports Science
- Training Methodology
Background:
- Existing high-intensity interval training (HIIT) categorization models lack consistency in definition, terminology, and completeness.
- A unified and scientifically sound framework for HIIT is needed to advance research and practical application.
- Varied HIIT protocols make it challenging to compare study findings and optimize training outcomes.
Purpose of the Study:
- To present a novel, training goal-oriented categorization model for high-intensity interval training (HIIT).
- To establish a consensus among diverse HIIT definitions and concepts found in the scientific literature.
- To provide a structured foundation for future research, including systematic reviews and meta-analyses on HIIT.
Main Methods:
- A comprehensive literature review was conducted to identify and analyze existing HIIT categorization models.
- A new model was developed based on the interplay of interval duration, interval intensity, and the interval-to-recovery ratio.
- Six distinct HIIT types were derived from the literature to form the proposed categorization framework.
Main Results:
- A six-type categorization model for HIIT is proposed, grounded in the interaction of key training variables.
- The model elucidates the scientific underpinnings of each HIIT type and their potential physiological effects.
- Potential impacts on aerobic, anaerobic, and neuromuscular systems, as well as transfer effects on competition performance, are discussed.
Conclusions:
- The proposed HIIT categorization model offers a standardized "toolbox" for goal-oriented training prescription.
- Identified research gaps and discrepancies highlight the need for more randomized controlled trials, particularly in elite athletes.
- This framework aims to enhance the consistency and comparability of HIIT research, facilitating future meta-analyses.
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