Freebase(0.00 / 0 votes)Rate this definition: Commonly used in medicine, the word decubitus is used to mean lying down. It is derived from the Latin verb âdecumbereâ meaning to lie down.
The brain regulates metabolism and manages other functions to keep your body temperature within a normal range. But the brain can only do so much, and a host of outside factors can affect your body temperature. Controlling and managing these outside factors is key to maintaining a normal body temperature.
Your basal metabolic rate, which keeps your organs functioning, burns about 70% of your calories. Physical activity adds about 20% and digestion about 10%. The idea that drinking cold water must burn more calories developed from the belief that our bodies expend energy to warm up. It is true that your body will work to raise its temperature to 98.6 degrees Fahrenheit, but it will only expend about eight calories to do this.