A recent study found no significant differences between thin and obese persons in the thermic responses to stress, and it was proposed that sweating does not burn fat. There is a theoretical suggestion that sweating may increase the appetite hormones ghrelin and catecholamines. However, the effect of sweating in an uncontrolled, open clinical trial was not significant. However, if one is sweating due to the heat of an exercise-induced hot place, it can be argued that the sweat could increase the heat induced by metabolic processes. Although this has not yet been determined, these conditions will cause the thermic response to an environmental stimulus to increase, potentially resulting in fat burn. Moreover, it has been shown that there is a positive relationship between a rise of metabolic rate following exercise and the size of fat deposits on the skin.
How long does sweating last? Some studies have suggested that sweat duration (as measured by sweat-toned area measurements) may play an important role in the thermic response to a heat stress and that the duration of sweat depends on various factors such as exercise intensity, muscle size, and body composition. For example, the duration of the sweat is shorter after exercise lasting less than 10 min. The difference becomes significant when exercise duration is greater than 3 h or when the exercise is performed in a hot environment.
What else does sweating do? Sweat has been shown to increase blood flow, and, in fact, increase the amount of blood circulating in the body, thus increasing blood pressure. However, as in all other mechanisms of resistance, it is possible that the effects of sweating are dependent on the source of the heat and the temperature of the sweat as well. Thus, the sweat of obese persons may increase blood pressure even at room temperature, while the sweating of thin persons may result in blood pressure lowering in a cold environment.
What causes sweating? As with other forms of exercise, the factors contributing to sweat may vary considerably between persons. In overweight individuals, the sweat response may be affected by factors such as physical activity level, dietary intake, skin condition, and the use of alcohol, which has been shown to increase sweating. It is also known that in most subjects an elevated pulse rate at the beginning of exercise increases the number of sweating units. An increased heart rate and sweating is a hallmark feature of obesity, which results in sweating increases in the body.
The degree to which sweat is an adaptation to a given stress can vary.
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