Soldiers' load carriage performance in high mountains: a physiological study

Area of Science:

• Physiology
• Altitude Research
• Military Science

Background:

• High-altitude environments pose unique physiological challenges for soldiers.
• Understanding load carriage performance is critical for military operational effectiveness.

Purpose of the Study:

• To evaluate the physiological responses of soldiers during load carriage at extreme high altitudes.
• To examine changes in maximal oxygen consumption (VO2max) at varying altitudes, loads, and speeds.

Main Methods:

• Twelve Indian Army soldiers underwent acclimatization at 3,505 m and 4,300 m.
• Participants performed treadmill walking trials with varying loads (0-30 kg) and speeds (2.5-3.5 km/h).
• Physiological parameters (oxygen consumption, heart rate, ventilation) and perceived exertion were recorded; VO2max was measured.

Main Results:

• Maximal oxygen consumption (VO2max) significantly decreased with increasing altitude.
• Physiological strain (oxygen consumption, heart rate, ventilation) increased with higher loads, altitude, and speed.
• Soldiers reported high perceived exertion at higher loads and faster speeds.

Conclusions:

• High altitude significantly impairs soldiers' aerobic capacity and increases physiological strain during load carriage.
• Recommendations include slower walking speeds, adequate rest, and limiting carried load to 32% of body weight.
• These findings are crucial for optimizing soldier performance and safety in high-altitude operations.