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KMID : 0351619690100010031
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Kyungpook Medical Journal
1969 Volume.10 No. 1 p.31 ~ p.48
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A Study on the Specific Gravity of Human Hairs
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Abstract
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As hair is one of the important skin appendages, its biological and pathological states are closely related with the skin itself and so the specific gravity of hair, a physico-chemically and structurally combined expression, will con-tribute in the resolution of the basic pathological problems of the skin and hair.
Although a little research has been done on this theme in other countries so far no study has been made on the specific gravity of the hair of Korean people, so the specific gravity has been measured for 488 healthy Korean people under various conditions whose ages range from birth to 7~ years old and for 102 patients who have skin disease or chronic internal diseases including psoriasis vulgaris, alopecia areata, seborrheic dermatitis, ichthyosis vulgaris, leprosy, pulmonary tuberculosis, hyperthyroidism, and cachectic patients due to various internal diseases.
Results obtained are summarized as follows:
I The specific gravity (S. G.) of hair in healthy people.
1. The S. G. of scalp hair ranges from 1.3155 to 1.3531, with 1.33150.000 3 as the average for all healthy People studied.
2. The S. G. of scalp hair ranges from 1.3173 to 1.3531, with 1.3302C. 0003 as the average for males and 1.3155 to 1.3528, with 1.3324 0.0003 as the average for females.
3. The S. G. of scalp hair in relation to both age and sex.
1) The S. G, of scalp hair is the lowest around the 20 year old group in both sexes.
2) For males the S. G. of scalp hair is the lowest in youth and the highest in old age.
3) For females the S.G. of scalp hair is the lowest in puberty and the highest in child-hood.
4) The S. G. of scale hair in males is higher than in females during puberty, climacteric and old age groups and it is reversed in the other age groups (such as baby and childhood, }youth and prime of manhood).
4. Seasonal variation of the S.G. of scalp hair is highest in winter, nest in spring, lowest in summer.
5. Among the scalp, axillary and pubic hair, the: axillary hair has the highest S.G. and thf: scalp hair the lowest, with the S. G. of pubic hair being inbetween.
6. In the observation of scalp hair, there is no remarkable difference in the S. G. according to regions of growth.
7. The S. G. of black hair is higher than white hair.
8. At the root end the S. G. of epilated hair from scalp is higher than non-epilated hair and the S.G. of the end is higher than the root in both epilated and non-epilated hair.
II. The S. G. of scalp hair as observed in se-veral diseases.
1. In alopecia areata among non-epilated, easi´.ly epilated and regrowing hair of the lesion, the S.G. of the latter is highest and no remar kable difference is observed between epilated and´. non-epilated. The S. G. of both non-epilated and. epilated in alopecia areata is lower than that in healthy people.
2. In person with psoriasis vulgaris the S.G. is lower than that in healthy populace.
3. In people with seborrheic dermatitis the S. G. of scalp hair is lower than that in healthy people, of the same age groups.
4. In people with ichthyosis vulgaris the S. G. of scalp hair is lower than that in healthy people.
5. In leprosy patients the S. G. of scalp hair is slightly higher than that of healthy person in winter but similar in spring.
6. Between healthy people and those with. pulmonary tuberculosis there is no remarkable , difference in S. G. of scalp hair.
7. The S. G. of scalp hair in people with. hype:rthyrodism is lower than in healthy people.
8. No remarkable difference of the S.G. of scalp hair is observed between healthy persons and cachectic patients suffering from various internal diseases.
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