Effect of leanness on autonomic regulatory function in young female
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概要
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In order to clarify the effects of leanness on autonomic regulatory functions, energy intakes, vital signs, and cold-induced peripheral vasodilation were investigated on 5 lean and 17 normal female students. The body weight, BMI, degree of obesity, and body fat rate were lower in the lean group than those in the normal one, however body height and vital signs, such as tympanic temperature, pulse and blood pressure, were not different between the groups. The daily intakes of energy, as well as protein and carbohydrates, were the same in both groups, but that of fat was less in the lean group. The energy intakes of the students were extremely small in even the normal group as compared to the recommended daily intake for their age and gender group.<BR>The cold-induced peripheral vasodilation (Levis reaction) of the lean group was lower than that of the normal group. The present results suggest that an enhanced activity of the sympathetic nerves contributes, partly, to cause the physical difference between lean and normal groups, possibly through an increase of energy dissipation. It is also supposed that decreases in tolerance not only for cold but also for immunological activity occurred in excessively lean subjects because of a general disturbance of the autonomic regulatory systems in the body.It is, therefore, important to correct the false admiration among young females for leanness as beauty, and to encourage them to build truly healthy and beautiful bodies.
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