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The hunting reaction or hunting response is a process of alternating vasoconstriction and vasodilation in extremities exposed to cold. The term Lewis reaction is used too, named after Thomas Lewis, who first described the effect in 1930. [1] Vasoconstriction occurs first to reduce heat loss, but also results in strong cooling of the extremities.
“Cold hands from benign causes are usually of a short duration, and easily reversible when the triggering condition such as stress or exposure to low temperature abates,” Ogunwale explains.
The protection is highly dependent on frequency range; most gloves provide no protection in palm and wrist below ~50 Hz and in fingers below ~400 Hz. Factors such as high grip force, cold hands or vibration forces in shear direction can have a reducing effect and or increase damage to the hands and arms.
The condition can cause localized pain, discoloration (paleness), and sensations of cold and/or numbness. When exposed to cold temperatures, the blood supply to the fingers or toes, and in some cases the nose or earlobes, is markedly reduced; the skin turns pale or white (called pallor) and becomes cold and numb.
Any type of cold can be a trigger, including reaching into the freezer, holding a chilled drink or relaxing in an air conditioned room. Rare disorder can turn fingers and toes white or blue when ...
Whether you’re walking around outside during the chilly winter months, or sitting in a cool, air-conditioned room in the summer, cold hands are often a response to a temperature change in your ...
Origins of heat and cold adaptations can be explained by climatic adaptation. [16] [17] Ambient air temperature affects how much energy investment the human body must make. The temperature that requires the least amount of energy investment is 21 °C (70 °F). [5] [disputed – discuss] The body controls its temperature through the hypothalamus.
Nonfreezing cold injury is diagnosed based on symptoms and history of prolonged exposure (usually 12 hours to 4 days) to cold moisture above freezing temperatures. [7] Those affected report loss of sensation in affected skin for at least 30 minutes and abnormal sensation when experiencing rewarming. [4]