So...I googled CT and read all that I could find on it and watched a couple of Youtube videos, but, I still find myself lacking some specifics.
Temperature seems to be key, but this is where my confusion comes in. What temperature? I think I read 10 degrees Celcius? Is that water temperature only? Can it be surface temp, like of an ice cube bag or a skin surface?
Also is CT the same as lowering core body temp? Do they have the same goals?
Any info at all would be helpful as I am very intrigued by this concept, but I really felt that I read so much, but got so little true understanding from what I read.
Being discussed here.
Basically, cold receptors in the skin begin to fire at just below body temp and are at their max output at around 50 deg F (10 deg C), this is accomplished via TRPM8 channels and sodium ions. The closer your skin gets to 10 deg C, the more cold thermogenesis is taking place. CT upregulates the metabolism in various ways, goose bumps, shivering, and the burning of free fatty acids in brown adipose tissue. Chronic exposure to cold recruits new brown adipose tissue. BAT has some very unique properties and a direct correlation has been seen in people with little BAT and obesity.
An occasional cold bath or shower or walk in the cold won't burn many calories, but chronic exposure to lower temperatures increases your metabolism and the increase is kept up even when warm.
Cold thermogenesis refers to the creation of heat through cold. Other types of thermogenesis are exercise-induced, overeating, and non-shivering.