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Updated: Jun 2, 2026
A Real-World High-Intensity Interval Training Protocol for Cardiorespiratory Fitness Improvement
Published on: February 22, 2022
Comparing In-Person to Tele-Exercise High-Intensity Interval Training in Adults With Class II/III Obesity
Lisa Chionis1, Maya Watanabe2, Evan L Reynolds3
1University of Michigan Medical School, Ann Arbor, Michigan.
Objective:
The COVID-19 pandemic accelerated the use of tele-exercise. Providers must now determine the most suitable modality of supervised exercise training for patients. This study compared exercise attendance and intensity during supervised high-intensity interval training (HIIT) between in-person and tele-exercise sessions among adults with class II/III obesity.
Methods:
We conducted a secondary analysis of a randomized controlled trial of 62 participants examining exercise and surgical weight loss effects on neuropathy. Participants underwent 2 in-person supervised and 1 unsupervised HIIT sessions weekly for 2 years. After the pandemic onset, sessions shifted to tele-exercise. We evaluated associations between session attendance and intensity with pre- versus post-lockdown timing.
Results:
Supervised session attendance increased after switching from in-person to tele-exercise sessions (incident rate ratio [IRR]: 1.50, 95% CI: [1.27, 1.79]). Pre-pandemic follow-up time was associated with decreased attendance (IRR: 0.95, 95% CI: [0.94, 0.97]), but supervised session attendance increased after the COVID-19 shutdown (IRR: 1.05, 95% CI: [1.03, 1.07]). Participants with prediabetes or diabetes showed reduced attendance, whereas those undergoing bariatric surgery had increased attendance. No change was seen in exercise intensity after switching from in-person to tele-exercise sessions (point estimate: -0.01, 95% CI: [-0.02, -0.01]), but small effects of follow-up time on exercise intensity were seen with increases over time before the pandemic and decreases after the lockdown.
Conclusion:
Tele-exercise resulted in improved attendance for HIIT training among adults with class II/III obesity without meaningful differences in exercise intensity, supporting its use for this population.
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