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Changes in male reproductive function after high altitude mountaineering
Akiou Okumura1, Hideki Fuse, Yoko Kawauchi
1Department of Urology, Faculty of Medicine, Toyama Medical and Pharmaceutical University, 2630 Sugitani, Toyama, Japan. oku18@ms.toyama-mpu.ac.jp
High Altitude Medicine & Biology
|October 17, 2003
Summary
High altitude exposure temporarily impaired sperm count and testosterone levels in male mountaineers. Reproductive functions, including sperm health and hormones, fully recovered within two years.
Area of Science:
- Human Physiology
- Reproductive Biology
- High-Altitude Medicine
Background:
- High-altitude environments pose physiological challenges.
- Male reproductive health effects at extreme altitudes are not fully understood.
Purpose of the Study:
- To investigate the impact of a high-altitude expedition on male reproductive functions.
- To assess changes in semen parameters and hormone levels post-expedition.
Main Methods:
- Semen analyses and endocrine tests were performed on three male subjects.
- Specimens were collected before, and at 1 month, 3 months, and 2 years after the expedition.
Main Results:
- Sperm counts and testosterone levels decreased post-expedition, with delayed recovery.
- Abnormal sperm morphology increased initially but largely recovered within 3 months.
- Semen volume remained unchanged throughout the study period.
Conclusions:
- High altitude sojourns can induce temporary spermatogenic and Leydig cell dysfunction.
- These reproductive effects appear to be reversible over a two-year period.
- Further research is needed to understand long-term implications and mechanisms.