Effects of spaceflight on the brain.

Area of Science:

• Neuroscience
• Space Medicine
• Human Physiology

Background:

• Increased long-duration human spaceflights reveal significant central nervous system (CNS) effects.
• Microgravity causes fluid shifts, brain changes, and sensory alterations, impacting astronauts' sensorimotor functions post-flight.

Purpose of the Study:

• To summarize the known effects of microgravity and space radiation on the CNS.
• To highlight the need for further research to mitigate these risks for future deep space exploration.

Main Methods:

• Review of physiological changes observed during and after spaceflights.
• Analysis of research on the impact of galactic cosmic radiation on brain structures and function.

Main Results:

• Microgravity induces headward fluid shifts, brain volume changes, and altered sensory processing, leading to postflight sensorimotor impairment.
• Space radiation poses risks to blood-brain barrier integrity and brain structures, as suggested by rodent studies.

Conclusions:

• Spaceflight presents multifaceted challenges to CNS health, including microgravity-induced alterations and radiation exposure.
• Mitigating these CNS effects is essential for ensuring astronaut safety during extended missions, particularly for Mars expeditions.