High altitude underground mining. Acclimatization and possible toxicological risks.

Area of Science:

• Occupational Health
• Environmental Physiology
• Altitude Medicine

Background:

• Mine workers at high altitudes face unique physiological challenges.
• Understanding responses to hypobaric hypoxia is crucial for worker health.
• Key parameters include ventilation, heart rate, and hemoglobin saturation.

Purpose of the Study:

• To measure initial physiological responses to hypobaric hypoxia in high-altitude miners.
• To assess changes in ventilation minute, heart rate, and hemoglobin saturation.
• To contrast these responses with those of workers at lower altitudes.

Main Methods:

• Studied Chilean miners in an underground mine at 3,070–3,656 masl.
• Implemented a 4-day work, 4-day rest shift system.
• Compared high-altitude data with results from workers at 800 masl.

Main Results:

• Miners with <6 months exposure or exposed to contaminants showed hemoglobin saturation <90%.
• Heart rate increased with acute/chronic high-altitude hypoxia exposure.
• Miners' resting heart rate was lower than non-exposed clerks; minute ventilation was higher at altitude.

Conclusions:

• Most miners demonstrated acclimatization responses to high altitude.
• Elevated minute ventilation indicates a risk from inhaled workplace toxins.
• Urgent research is needed on combined effects of high-altitude hypobaric hypoxia and mine toxins.