Frankenhaeuser's research on cortisol levels of male and female managers found that:

Cortisol levels for both the men and women remained relatively low throughout the work day, signifying that men and women in high powered positions experience low levels of work stress.

While cortisol levels peaked for both men and women during the early afternoon of the work day, levels returned to baseline for both groups shortly after returning to their homes.

Cortisol levels only peaked for female employees.

Cortisol levels remained high into the evening for the female employees but not the male employees.