Work performance of high-altitude Aymara males

Area of Science:

• Physiology
• Altitude Medicine
• Sports Science

Background:

• High-altitude populations exhibit unique physiological adaptations.
• Understanding age-related changes in aerobic capacity is crucial for occupational health, especially for high-altitude workers like porters.

Purpose of the Study:

• To investigate the relationship between age and cardiorespiratory fitness indicators in Aymara male porters.
• To assess the impact of aging on maximal oxygen uptake (VO2max) and submaximal exercise performance.
• To evaluate the adaptive status of high-altitude natives across different adult ages.

Main Methods:

• Cross-sectional study involving 28 Aymara males (15-43 years) residing at high altitude (3700 m).
• Measurement of maximal oxygen uptake (VO2max) and maximal work output.
• Assessment of oxygen consumption (VO2) during submaximal exercise and relative work intensity (VO2/VO2max).

Main Results:

• A significant negative correlation was observed between VO2max and age.
• Maximal work output showed a significant positive correlation with age.
• VO2 during submaximal exercise decreased with age, but relative work intensity remained stable.
• Chest size did not show a significant influence on the oxygen transport system's effectiveness.

Conclusions:

• Despite a decline in VO2max with age, Aymara male porters maintain their adaptive status due to increased maximal work output and stable relative exercise intensity.
• Age-related physiological changes in this population do not necessarily impair overall functional capacity at high altitudes.
• The study provides insights into the resilience and adaptability of high-altitude native populations to physiological stressors associated with aging and work.