Weekly HIIT session matched a three-day schedule
Both workout formats improved body fat and cardiovascular fitness during the 16-week trial.
A 75-minute HIIT workout performed on one day produced body-fat results comparable to splitting the same weekly duration across three days. The randomized trial followed 315 inactive adults in Hong Kong for 16 weeks. Participants carried extra weight around the waist and averaged 48 years of age, a BMI near 29 and a waist measurement near 95 cm or 37.4 inches.
Against the education-only comparison arm, the condensed schedule was associated with roughly 1.7 pounds (0.8 kilograms) less fat. For the divided schedule, the difference was about 2.2 pounds (1.0 kilogram). Researchers found no meaningful statistical separation between the two exercise formats. Both also increased cardiorespiratory fitness, reflecting better oxygen delivery by the heart and lungs during activity.
The findings offer more scheduling flexibility for people who struggle to fit exercise into several days. However, the research covered HIIT and body-fat changes during this specific period, not every part of physical fitness. Resistance exercise has separate roles in preserving muscle, supporting metabolism and bone health, managing blood sugar and maintaining everyday movement. Walking and moderate-intensity cardio also remain parts of a balanced activity routine.
- The comparison arm attended health education classes every two weeks.
- HIIT cycles between demanding efforts and recovery intervals.
- No workout-related injuries or harmful events were recorded.
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