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Updated: Aug 8, 2026

A Real-World High-Intensity Interval Training Protocol for Cardiorespiratory Fitness Improvement
Published on: February 22, 2022
Characterizing enjoyment of high-intensity interval training in association with exercise exertion among inactive
Alfred Min1, Barbara De Barros Gonze1, Rebecca A G Christensen1
1Department of Kinesiology, University of Toronto, Toronto, ON, Canada.
Abstract:
Enjoyment across treadmill-based high-intensity interval training (HIIT) is unclear in women with cardiometabolic risk factors. Nineteen inactive women (53 ± 13 years; 29.1 ± 7.1 kg/m2) performed three HIIT protocols in randomized order: 4 × 4 min (80% volume of oxygen consumption reserve (VO2R)), 10 × 1 min (90% VO2R), and 8 × 15 s (110% VO2R). Heart rate, rating of perceived exertion (RPE), and exercise enjoyment (short-form physical activity enjoyment scale ∼5 min post-exercise) were assessed. The 4 × 4 min protocol elicited higher heart rate and RPE and lower enjoyment than other protocols (p < 0.05). Enjoyment did not differ between 10 × 1 min and 8 × 15 s (p > 0.05), although 10 × 1 min elicited greater exertion (p < 0.05). The 10 × 1 min protocol may balance enjoyment and exertion. ClinicalTrials.gov: NCT05758857.
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