Interesting answers. The biochemistry of ATP production is fascinatining. In the mitochondria or in the cytoplasm the production of ATP is a miracle. One can do gas analysis or look at expired gases, but so what? Eat healthy, most of the time, get on your bike and go for a long spin, and sit back in your chair and take a much needed break. Danny
The only true way to determine that is to have a gas analysis. The person is wears a mask and their exhalations are analyzed.
This analysis tells what the person is burning.
This is very simplistic; hopefully you get the gist. As for a general idea, it can be calculated to get a rough estimate.
As stated, this is a complex question. During exercise you are burning some of both sources and even some from protein. The amount depends on a number of factors. All of these factors play a different role in the energy system at different times. In a nut shell, fat takes a longer time to contribute energy and tends to be too slow to contribute in high intensity exercise the way that carbohydrates can. But fat does still contribute in all exercise to some degree.
If you are looking at this from a weight loss perspective, fat will contribute to the recovery refueling of muscle energy stores after exercise along with the post exercise fuel that you should be consuming. The body will allocate calories to go back into the fat cells if there is enough excess to cover it. Some of the fat energy is going to go into the fat cells no matter what, but if there is a calorie deficit (not too extreme), the fat cell will release some of that restored fat over the course of time.
I have really (really really) over simplified this as I don’t think I should spoon feed you everything. I do teach such topics to interested students. And this type of information is the type that I do feel can be shared in an online learning environment. You can check out my website if you think you might be interested in some of my CEC courses. I teach over a dozen topics that are already set up. But I also teach to specific request topics as needed. www.hawaiifitnessacademy.com or contact me through my IDEA profile.
Hello Julia Conaway,
There really isn’t a simple answer. The article Harris supplies explains it nicely enough to understand what is going on; but, no one really knows the exact moment. I like the tip to exercise first thing in the day vs. the end of the day; but, please, be prepared with some nourishment if you decide to go out without breakfast. Safety is number one, along with health, then the body will be able to adapt to perform the workouts and reap benefits. But, you already know this, of course.
Natalie aka NAPS 2 B Fit.
Thank you so much for taking the time to answer. I printed the article you linked. I am giving it to a “Fitness professional” chiropractor that team taught a class and now teaches at a local Y. He asked my opinion -as a GrpX instructor of 31 years – but it is SOOO open-ended and yes, there are so many variables. I have included in my “education package” for him: Burning fat Myths and Facts and What do mitochondria do?
Thank you again