Scientists led by Jean Duffy of Harvard University has stated that passive energy in the human body depends on circadian rhythms. As reported by N+1, the researchers found that less calories in the waking state, rest is burned during the biological night and during the biological day.
In the study, researchers observed 13 volunteers, who for 37 days lived in the laboratory without external light sources, electronic devices and watches. Each of the volunteers kept a strict diet and routine. In the first three days of the experiment, the people lived according to the Protocol 24 hours a day with extended time in bed – about 16 hours. Then volunteers were divided into two groups: six continued to live in a 24-hour schedule (control group), and a bedtime of seven people every day were shifted by four hours, extending thus their day to 28 hours.
As a major metabolic rate, the researchers used the amount of carbon dioxide that the body produces when breathing, the rate of oxidation of fats and carbohydrates. It was established that the lowest consumption of energy body that is at rest, occurs during the onset of inner night, and the biggest – after about 12 hours, sometime after awakening.
It is worth noting that up to 70% of daily calories burned is spent on the maintenance necessary for the survival of the organism biological functions: breathing, brain activity and body temperature regulation.