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Sweating versus Water LossThere are two ways in which water can be eliminated at the skin surface level. The first is sweating, a process with which we are all relatively familiar. Sweating is an 'active' process and responds to nerve impulses when the core body temperature increases (e.g. exercise, stress, warm environment). Having said this, there also exist a 'passive' or insensible (or imperceptible) process which is referred to as transepidermal water loss (TEWL). This is essentially the passage of water across the skin's surface. This form of water loss does not involve the sweat glands. If you think transepidermal water loss (TEWL) is insignificant, think again. Under normal circumstances, the body sheds about 30g of water per hour. That's about an once of water per hour or the equivalent of one can of soda every half day. We often refer to TEWL when we treat dry skin. In fact, skin creams are essentially barriers that we apply to prevent TEWL. By doing so, we allow the skin to remain hydrated. |
Similarly to sweating, TEWL varies with the different regions of the body. The chart below demonstrates the rates of water loss across different regions of the body. Although TEWL is independent of the presence of sweat glands, the most active water loss regions are similar the those that sweat heavily. These include the palms, feet, underarms, cheeks and forehead.
Keep in mind that hyperhidrosis or excessive sweating is not regulated by or related to TEWL. Sweat gland activity is wholly responsible for the excessive sweating experienced by an individual. |