A 16-week randomized controlled trial with over 300 participants tested the effects of once-weekly vs. thrice-weekly HIIT sessions (75 minutes total) in overweight adults. Both test groups reduced body fat compared to controls, and did not differ in reduction of body fat and waist circumference. The 3x/week group gained better cardiorespiratory fitness.
Original paper: https://www.nature.com/articles/s41467-025-68149-7




