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Pain and Muscle | April 14, 2021

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Calorie Expenditure Explained

Calorie Expenditure Explained

The Calorie expenditure is the energy consumed by the body to meet its needs, keeping warm, to digest and think, but also to move, so to allow the muscles to contract.

Energy expenditure is influenced by many factors, there are three main ones:
- Muscular work.
- Regulating the temperature of the body.
- Digestion.

3 factors that influence the Calorie Expenditure

calorie expenditure activity

1- Muscular work:

Muscular work is a major factor in the increase in calorie consumption. Indeed, during a sporting activity, this expenditure increases in proportion to muscle mass.

In bodybuilding, energy efficiency is not good because only 20 to 25% of the energy is used by the muscles, whereas in other sports, it may reach 50%.The amount of energy consumed by the muscular work is very variable according to the individuals and the sport. It varies from 1000 Kcal per day (average activity) to 4000 Kcal (high-level athlete).
Also note the work of the muscles of the digestive system, respiratory system, heart, … so all internal muscles that also consume calories.

2- Thermoregulation (Temperature control):

Thermoregulation is the regulation of the temperature of the body at a constant level.

The neutral temperature is 22 ° C, at this temperature, the body spends no energy, to warm up or cool down. On the other hand, below, it should produce heat to warm up: it’s the Thermogenesis.

Finally, at the top, the body must cool: this is the thermolysis, which it consumes also calories (by including sweating).

So summer or winter, your body spends calories to regulate.

3- Digestion:

Digestion is the action of digesting, transform, and transport the food consumed.

This costs more or less of energy depending on the food eaten. In fact, the digestion of carbohydrates increases from 5% to 8% basal metabolism, compared with 3% for fat and 15% to 20% for proteins.

This means that part of the absorbed calories are used to achieve their own digestion.

Attention: this does not mean that you must not count this percentage of calories in your daily calorie intake.