Paul Webb Cycling at 50 years old plus

Paul Webb Cycling at 50 years old plus

All Hail to the Energy Sources

The BlogPosted by Paul Webb Sat, May 25, 2013 22:22:00

Ever wondered how we create energy and whats really going on inside our little furnaces?

We have four sources of energy to choose from:

* Carbohydrates
* Protein
* Fat
* Alcohol

All of these sources have to be converted into Adenosine Tri Phosphate (ATP) before it can be used.

ATP is a small molecule consisting of an Adenosine backbone and three Phosphate Groups attatched. The Backbone of the ATP molecule is split and this releases the energy.

This in turn produces Adenosine Di Phosphate which in turn is converted back into ATP.


Energy is ultimately given off from the body as heat and is measured in Heat:

Joule = small unit
cal = small unit
Cal = KiloCal
KJ = KiloJoule to convert into KiloCalories times by 4.2

1 Joule is the amount of energy used to to move a weight of 1 kg 1 Newton (N) meter.

1 cal is defined as the amount of heat required to increase 1 gram (g) of water by 1 degree centigrade.

Energy Values of the four sources of energy:

* Carbohydrates = 4 Kcal; (17KJ)
* Protein = 4 Kcal (17KJ)
* Fat = 9 Kcal (38 KJ)
* Alcohol 7 Kcal (29KJ)

As you can see that fat is the best value fuel however it takes longer to produce and is only available at certain levels of effort < 70% V02MAX, however there is an almost unlimited supply!



How much of these sources do i have stored?

* FAT
Your body stores fat as adipose tissue, its is stored under the skin and is packed for padding around the organs, and in the muscles. Men tend to store fat around the belly (Apple Shape) Women tend to store it around the Hips, and thighs (Pear Shape).

300 - 400g in muscles (intra muscular) 10 - 15KG fat around the organs

* Carbs
400g -500g = 1600 - 2000 Kc stored as Glycogen in the Muscles with about 3 times its own weight in water, Liver, this is why people on a low carb diet tend to lose a lot of weight initially!

* Protein
Stored as Muscle which can be broken down and used as energy (catabolism which tends to happen at the end of prolonged exercise).

* Alcohol
Stored in the Liver

See next topic "Our Little Furnaces" the Energy Systems"

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