How many grams of FAT do we burn when doing stationary bike?

hot_ken

How do we know how many grams of fat do we burn when doing cardio (stationary bike in my case)?

I usually bike for 40 minutes 3 times a week.

Any ideas on how many grams of fat I burn (I bike moderate to vigorous effort)

* I'm Ken, 5'6'', 133 lbs, Filipino.

Thanks a lot!

ken

hot_ken

How do we know how many grams of fat do we burn when doing cardio (stationary bike in my case)?

I usually bike for 40 minutes 3 times a week.

Any ideas on how many grams of fat I burn (I bike moderate to vigorous effort)

* I'm Ken, 5'6'', 133 lbs, Filipino.

Thanks a lot!

ken

sanlin20

I'll help you with your question. You expend 292 calories of energy for 40 minutes of stationary biking. In the best case scenario, if all those energy indeed comes from the body fat, you burn 292/9 = 32 grams of fat since each gram of body fat stores 9 calories. Keep in mind that some or all the biking energy expenditure may also come from the food you ate earlier.

My friendly suggestion is that you not be too occupied by how much fat SHOULD burn by an activity. In spite of the exercises, body fat/weight may still fluctuate day by day. The key to a successful weight control, I believe, is to persistently and consistently stick to the daily/weekly nutritional and fitness goals. This website can help you in setting those goals as well as keeping track.

Azdak

Two things: first of all, without doing O2 analysis, you really don't know. Two, it doesn't make any difference. Any "fat" that you do consume during exercise is not coming from stored body fat (i.e. the visible "bulges" you see). Fuel substrates used during exercise and overall body composition changes are two different processes.

jtintx

Two things: first of all, without doing O2 analysis, you really don't know. Two, it doesn't make any difference. Any "fat" that you do consume during exercise is not coming from stored body fat (i.e. the visible "bulges" you see). Fuel substrates used during exercise and overall body composition changes are two different processes.

Can you elablorate on this in layman's terms. Thanks.

Edited to add: When does the body use stored body fat?

Azdak

Two things: first of all, without doing O2 analysis, you really don't know. Two, it doesn't make any difference. Any "fat" that you do consume during exercise is not coming from stored body fat (i.e. the visible "bulges" you see). Fuel substrates used during exercise and overall body composition changes are two different processes.

Can you elablorate on this in layman's terms. Thanks.

Edited to add: When does the body use stored body fat?

Exercise is a short-term activity that makes immediate demands on the body's ability to produce energy. Your body is constantly using a mixture of fats, carbs, and protein. During exercise, it adjusts the mix and utilizes whatever metabolic pathways necessary to meet the demands of the activity, including type, duration, intensity, environment, individual physiology, etc. The energy also must be delivered fairly rapidly. During exercise, the body uses what is available, including circulating blood glucose, amino acids, stored muscle glycogen, circulating triglycerides and triglycerides stored in the muscle cells. There is more than enough energy readily available in these stores to fuel the body for up to 2 hours of recreational exercise.

The process of mobilizing and using stored adipose tissue is a longer-term process that occurs in response to the overall balance between calorie intake and calorie expenditure. It does not occur during exercise--it occurs the other 23 hours a day. Even endurance athletes--marathoners, triathletes--do not use stored body fat during their events--they must replace their fuel stores with carbs and some proteins because body fat cannot be accessed quickly enough during exercise.

Trust me, if you ever went into true "fat burning" mode, you'd know it. In marathoning terms, it's called "hitting the wall". Because of the nature of fat metabolism, if you do switch over to mostly fat as an exercise fuel, you can only work at a max of about 60% effort (60% of VO2 max), although it feels like 100%. It's not pleasant.

jtintx

Two things: first of all, without doing O2 analysis, you really don't know. Two, it doesn't make any difference. Any "fat" that you do consume during exercise is not coming from stored body fat (i.e. the visible "bulges" you see). Fuel substrates used during exercise and overall body composition changes are two different processes.

Can you elablorate on this in layman's terms. Thanks.

Edited to add: When does the body use stored body fat?

Exercise is a short-term activity that makes immediate demands on the body's ability to produce energy. Your body is constantly using a mixture of fats, carbs, and protein. During exercise, it adjusts the mix and utilizes whatever metabolic pathways necessary to meet the demands of the activity, including type, duration, intensity, environment, individual physiology, etc. The energy also must be delivered fairly rapidly. During exercise, the body uses what is available, including circulating blood glucose, amino acids, stored muscle glycogen, circulating triglycerides and triglycerides stored in the muscle cells. There is more than enough energy readily available in these stores to fuel the body for up to 2 hours of recreational exercise.

The process of mobilizing and using stored adipose tissue is a longer-term process that occurs in response to the overall balance between calorie intake and calorie expenditure. It does not occur during exercise--it occurs the other 23 hours a day. Even endurance athletes--marathoners, triathletes--do not use stored body fat during their events--they must replace their fuel stores with carbs and some proteins because body fat cannot be accessed quickly enough during exercise.

Trust me, if you ever went into true "fat burning" mode, you'd know it. In marathoning terms, it's called "hitting the wall". Because of the nature of fat metabolism, if you do switch over to mostly fat as an exercise fuel, you can only work at a max of about 60% effort (60% of VO2 max), although it feels like 100%. It's not pleasant.

I have done bike rides of 3-4 hrs only consuming 1 bottle of Gatorade and an energy bar....about 365 calories. So if I used up all my readily available energy in the first two hours and only took in 365 calories where did my body get the other necessary calories?

jtintx

Bump - hoping for a reply.