The temperature of the muscles rises as they are used. Only 20-30% of the energy devoted for muscles to work is used for the actual actions, 70-80% disappears as heat.
The energy-giving nutrition provides the energy for the work of the muscles: from carbohydrates, proteins and fats. The molecule called ATP delivers a direct energy supply for muscle work. ATP derives from the breakdown of nutrition through digestion.
Carbohydrates are the most important source of energy, which can be used with aerobic and anaerobic training. During aerobic training the breakdown of carbohydrates is 10 times more effective and the resulting products (water and carbon dioxide) are easier to extract from the system.
Anaerobic training produces lactic acid, which leaves the system slowly, and can cause painful muscular strain for 2-3 days.
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