Results from 27 women and 20 men between the ages of 25 and 55 were included in the 12-week study, which was published in the journal Frontiers in Physiology.
The women who worked out in the morning, before 8:30 am, burnt more body fat than those who worked out in the evening, especially around the abdomen. For the men, the opposite turned out to be true. Those whose workouts occurred between 6 and 8 p.m. Compared to their early-morning colleagues, they burnt more body fat. Women who exercised in the evening saw bigger increases in upper-body strength. These findings support the notion that both men and women exercise differently depending on the time of day. The results of this short study, however, cannot be regarded as definitive.