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Updated: Apr 30, 2026

A Real-World High-Intensity Interval Training Protocol for Cardiorespiratory Fitness Improvement
Published on: February 22, 2022
High-intensity interval exercise induces 24-h energy expenditure similar to traditional endurance exercise despite
Lauren E Skelly1, Patricia C Andrews, Jenna B Gillen
1Department of Kinesiology, Ivor Wynne Centre, McMaster University, Hamilton, ON L8S 4K1, Canada.
Abstract:
Subjects performed high-intensity interval training (HIIT) and continuous moderate-intensity training (END) to evaluate 24-h oxygen consumption. Oxygen consumption during HIIT was lower versus END; however, total oxygen consumption over 24 h was similar. These data demonstrate that HIIT and END induce similar 24-h energy expenditure, which may explain the comparable changes in body composition reported despite lower total training volume and time commitment.
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