Sex differences in regional cerebral blood flow

Area of Science:

• Neuroscience
• Physiology
• Medical Imaging

Background:

• Cerebral blood flow (CBF) is a critical indicator of brain health.
• Understanding sex-based differences in CBF is essential for interpreting neurological function and disease.

Purpose of the Study:

• To investigate sex differences in regional and global cerebral blood flow in healthy adults.
• To examine the relationship between age and cerebral blood flow in men and women.

Main Methods:

• Regional cerebral blood flow was measured using the 133-xenon inhalation method.
• 38 healthy men and 38 healthy women, aged 18-72 years, were included.
• Pairwise matching was used to control for age.

Main Results:

• Women demonstrated an 11% higher global cerebral blood flow compared to men across all age groups.
• Both sexes exhibited a significant age-related decrease in cerebral blood flow.
• Sex-specific differences in regional flow distribution were noted, with men showing right-sided frontal asymmetry and women displaying more symmetric flow.

Conclusions:

• Higher global cerebral blood flow in women may be a systemic physiological difference, potentially linked to cardiac index.
• Observed sex differences in regional flow patterns may reflect variations in cortical functional organization or resting-state mental processes.