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KMID : 0438219730100020533
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Korea University Medical Journal
1973 Volume.10 No. 2 p.533 ~ p.542
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Studies on Seasonal Variations of the Physiological Property in Man
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Abstract
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This experimental was carried out to investigate the existence or absence of adaptation to seasonal changes exhibited by men living in temperate climates for period of one year. The percentage of total body fat were calculated from skinfold thickness and urinary 17-ketosteroid excretion were measured by Rapaport´s method every season for the same subject in 60 healthy Koreans. Skinfold thickness at five sites, namely, back, waist, arm, abdomen and knee were measured by means of a Lange caliper. The findings obtained were as follows;
1. The course of increase in total body fat was identical to that of body growth from spring to winter season in a teen-agers of between 13 and 14 years. The mean total fat for one year were 17.4% of body weight in boys and 23.8% in girls.
2. Total body fat showed a decrease in a twenties, namely, 13.3% in male and 23.0% in female. subject.
3. In a thirties, the total body fat was predominantly increased to 26% of body weight, while negligible in male.
4. The skinfold thickness on all sites were greater in females than males at the same age. Although they showed different pattern.
5. Seasonal fluctuation has been observed in total body fat and subcutaneous fat thickness after twenties, rising during winter and early spring, falling in the summer.
6. The regional differences of the subcutaneous fat thickness was greater in male than that of female. neater in male
7. Urinary 17-ketosteroid excreation showed a continuous increase in absolute value as age increased, and falling in the summer in male. while any demonstrable changes in fenale.
Theories concerning the mechanism of the adaptation to seasonal changes were reviewed for the purpose of explanation of the results obtained. From the above findings, it may be speculated that seasonal fluctuation of fat and cortical hormone is an adaptation to cold, the increased fat providing extra thermal insulation. but it might also be related to the pattern of activity and food intake in excess of energy expenditure.
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