Kobe earthquake and reduced sperm motility

Area of Science:

• Environmental Health
• Reproductive Medicine
• Psychoneuroendocrinology

Background:

• The 1995 Kobe earthquake was a major natural disaster.
• Understanding the impact of catastrophic events on human health is crucial.

Purpose of the Study:

• To investigate the relationship between the Kobe earthquake and semen quality.
• To assess the effects of earthquake-related stress on sperm parameters.

Main Methods:

• Semen analysis (sperm concentration and motility) was performed on 27 male patients.
• Patients were categorized based on proximity to the earthquake's epicenter and housing damage.
• Comparison of pre- and post-earthquake semen parameters was conducted.

Main Results:

• No significant changes in sperm parameters were observed in men from low-magnitude zones (<4 Richter) or those unaffected by housing damage in high-magnitude zones (>6 Richter).
• Men experiencing partial or complete housing destruction showed a significant decrease (P < 0.001) in sperm motility post-earthquake.
• Sperm motility recovered within 2-9 months in most affected individuals, except for one patient with a severe personal loss.

Conclusions:

• Acute stress from catastrophic events like earthquakes can temporarily impair sperm motility.
• Semen quality may be a sensitive indicator of psychological distress following natural disasters.
• Sperm motility appears to be resilient and can recover after the resolution of acute stressors.