22% of body heat is generated from skeletal muscle (up to 80% during exercise） The part of the body that generates the most heat is the skeletal muscle which contributes to 22% of the total heat. Incidentally, the next is the liver 20%, 18% from the brain, and 11% from the heart. Because heat generation depends on metabolism, therefore a large amount of energy is also consumed by a number of vital organs; however, the largest proportion of heat generation is from the skeletal muscle and during exercise, it can reach up to 80%.
One of the reasons modern people are “cold” is because of lack of exercise causing reduced skeletal muscle. Therefore, heat generation is also reduced. This slows down the metabolism and the body is unable to handle waste and they accumulate as visceral fat, resulting in metabolic syndrome. Because there is no blood circulation in fats, it therefore leads to a vicious cycle and the body becomes cold. When the person is asleep, these fats will become cold quilts, causing the sleeping person unable to move/turn. In children with higher body temperature, regardless of how many times we help them to cover with the quilt at night, they will kick it off; but a person with cold body are most of the time those who sleep very deeply.
