Various Changes in Scalp Skin and Hair with Age

We investigated age differences of various parameters for hair and scalp skin in 153 healthy volunteers (13-69 years old, _??_: n=49, _??_: n=104). Age differences were showed clearly in some parameters that were (1) cross sectioned area (_??_ _??_) (2) water content (_??_) (3) cystine content (_??_) (4) contents of trace elements (Ca) (_??_)- as for hair shaft, and (5) sebum content (_??_ _??_) (6) stratum corneum cell area (_??_ _??_)- as for scalp skin. Parameters (1), (2), (3) and (5) decreased with age, and (4) and (6) ncreased with age. Many relationships among various parameters were found by means of multi value analysis of the experimental data. Some relationships suggested that hair follicle G6PDH activity and cystine content of hair shaft, played important roles in formation of hair structures and physical properties. And, polar lipids contents of hair were found to decrease with damaging of hair.