Actually, very recently a study was published on the matter. They found splitting the exercise in two different bouts instead of one achieved better results in terms of weight loss. However, the study only had 7 people participate in it. Which means? The study was absolutely worthless.
Do whichever fits into your life style the best. If one would go into the enzymatic process of weight loss. Then I would say the one hour session is "technically" better then the two thirty minute sessions. Of course, assuming both are completely equal in all aspects, beyond simply time per workout.
i can see it as being better in theory, working out will burn those calories then, basically equally, but splitting it up will help you to burn more while resting since you will jump ur metabolism with a good boost.
this is interesting
Your thinking of a process called the "thermic affect of exercise". Following a meal it can increase the "thermic affect of eating". Basically, moderate exercise following a meal. Can technically increase the amount of calories needed to properly digest the meal.I heard that each time you exercise - your metabolism = at a high for the following 30 minutes (which is why it may be good to eat right afterwards instead of later on in the day).. So, if this is true, exercising twice a day and eating after each exercise session- it will help your metabolism/lose weight.