Path analysis of selected components of the oxygen transport system.
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Age Factors↗
Biomedical subjects
R F Weisberg
Publications and source records attributed to R F Weisberg.
The "healthy worker effect"--fact or artifact?
Workers in five chemical plants with diverse characteristics were studied by attempting to locate all white male employees who worked at least 12 months over a 25 to 30 year period. Former employees were contacted directly, rather than using questionnaires or Social Security Administration files. The data were analyzed by comparing observed mortality to expected mortality based on age-sex-race specific death rates in the U.S. population. The results indicate that the mortality experience of the chemical workers studied is essentially that of the general population. It is suggested that the "healthy worker effect" may be due to methods frequently employed in searching for death claims which understate the true experience of the employee group studied, or if present, does not affect mortality rates for neoplastic or cardiovascular disease.
Cardiovascular Diseases↗
Effect of oral contraceptives on rhythmic urinary metal excretion.
Thirteen women, six of whom were using oral contraceptive agents, between the ages of 23 and 34 years, free from illness, and without a previous clinical history of menstrual abnormality, were studied with chronobiological methods for circadian (about 24 hour) patterns of metal and creatinine excretinine excretion. Circadian rhythms were detected for the excretion of lithium, potassium, iron, sodium, copper, and creatinine. Statistically significant by lower 24 hour excretion (mesors) of lithium, potassium, and iron was detected for the subjects using oral contraceptive agents. Although all women adhered to nearly identical activity-rest (synchronization) schedules, the peak times (acrophases) of the metal excretory rhythms for oral contraceptive users were phase delayed by about two hours.
Adult↗