Job strain variations in relation to plasma testosterone fluctuations in working men--a longitudinal study

Area of Science:

• Occupational Health
• Endocrinology
• Psychosomatic Medicine

Background:

• Job strain, defined as high psychological demands and low decision latitude, is theorized to increase energy expenditure and decrease anabolic processes.
• Previous research indicated that job strain correlates with increased systolic blood pressure, an indicator of energy mobilization.

Purpose of the Study:

• To investigate the relationship between job strain and plasma testosterone levels, a marker of anabolic activity.
• To examine how job strain influences testosterone levels in different work environments and in individuals with a predisposition to hypertension.

Main Methods:

• Four repeated observations were conducted every three months on 44 men across six diverse occupations.
• Self-reported job demands and decision latitude scores were calculated for each participant.
• Plasma testosterone levels were measured and compared between periods of high and low job strain.

Main Results:

• Total plasma testosterone levels increased when job strain decreased in sedentary work, but not in physically demanding work.
• Free testosterone levels did not show a significant association with job strain.
• Individuals with a family history of hypertension exhibited a more pronounced decrease in testosterone levels as job strain increased.

Conclusions:

• Job strain may influence anabolic activity, specifically total plasma testosterone, in a manner dependent on work type and individual health history.
• The findings suggest a complex interplay between occupational stress, physical activity, and hormonal regulation.