Historical Aspects of California State Park System

Physical activity, park access, and park use among California adolescents.

In California, 2.15 million adolescents (62.9%) do not engage in at least 60 minutes of physical activity five or more days per week. Adolescents who visited a park in the past month and those who live in a park service area are more likely to meet this goal. Lower-income California adolescents are less likely to visit local parks and more likely to believe local parks are unsafe. Actions by st...

Historical aspects of anxiety

"Anxiety" is a key term for behavioral, psychoanalytic, neuroendocrine, and psychopharmacological observations and theories. Commenting on its historical aspects is difficult, since history is properly a study of primary data. Unfortunately, much clinical anecdote does not correspond to factual records of a long time ago. Even reports of objective studies may suffer from allegiance effects. Thi...

Historical aspects of migraine.

The student of medicine first encountering the migraine literature will immediately perceive the extraordinary amount written, and will sense an unspoken frustrated fascination-a sort of blighted curiosity which pervades many accounts and descriptions. Enlightened self interest may explain some of the attention shown by physicians, since the incidence in our profession is as high as 30%. It is ...

The historical aspects of photocarcinogenesis.

The concept of photocarcinogenesis is of fairly recent duration. Although cancer of the breast is described in the ancient Greek medical literature, skin cancer is not mentioned even as late as the 18th Century. This is most likely due to the poor survival of humans, 80% of people did not live past 40 years, and only 6% lived longer than 60 years. The first association of skin cancer (face and ...

The historical aspects of sarcoidosis.