Yes, your ATP reserves can be accessed and utilized for energy production in a high-energy state. This is called ATP production (or the use of ATP) in the cell. ATP free energy is the energy the cell has available to sustain ATP production, but no longer requires ATP for activity such as cellular respiration, and is stored for later use. This energy, stored in the blood (ATP), serves as the primary energy source for all cellular activities.
Your cells use both ATP and glucose interchangeably. Your cells also use some glycogen to produce ATP. Glucose is also present in the blood and is used to replace ATP when no longer available.
In general, the more ATP (and sugar) you have in your blood compared to your body’s demands for ATP, the better you can produce ATP during exercise and reduce your glycogen consumption at rest. This is a great example of why ketogenic diets are so effective.
Some carbohydrates, and ketones (an ketone body, the major fuel storage molecule) like beta-hydroxybutyrate (BHB) are often found in the blood and serve as the primary energy source for the cell. BHB is also present in the blood at low levels due to some liver enzymes that do not use glucose for fuel.
The ketone body is the product of acetyl CoA (a component of glycerol). The term ketosis is also used to describe the condition of being in an area with high levels of acetyl CoA, and ketones.
The cell can have a steady use of up to 100% of its available energy (i.e. glucose, ATP and ketones) by producing ATP but can burn through it at any time without producing enough of a fuel source. This condition is called ketosis. Ketosis is often mistaken for high blood sugar.
How do carbs affect the body?
Your body has different cellular responses to various diets during exercise. Some of the cells are more susceptible than others to these changes. The effects vary depending upon the specific energy supply available to the cell, which depends upon its cellular needs. Some cell types have more favorable responses than others.
How do carbs affect the training process?
High dietary carbohydrates have a greater effect on the workout than do lower carbohydrate sources (e.g. carbohydrate-free milks, sweetened energy drinks, sugar-free coffee, etc.). Some people may be
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