Ten minutes of exercise will have an effect on your body for at least an hour afterward. Researchers from Massachusetts General Hospital measured changes in the blood of 70 healthy people of various levels of fitness.
"First, in 70 healthy people put on a treadmill, the team found more than 20 metabolites that change during exercise, naturally produced compounds involved in burning calories and fat and improving blood-sugar control. Some weren't known until now to be involved with exercise. Some revved up during exercise, like those involved in processing fat. Others involved with cellular stress decreased with exercise."
Leaner people had higher amounts of niacinamide which is a metabolite related to blood sugar control. People who were in better shape, according to their oxygen intake while they were exercising, seemed to burn more fat than those who were experiencing shortness of breath. There were also marathon runners in the group being tested. These people had ten times the amount of niacinimide after racing.
One of the goals of this research was to gather data that may ultimately lead to more personalized medicine.
http://news.yahoo.com/s/ap/20100601/ap_on_he_me/us_med_healthbeat_exercise_metabolism