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Summary
Exertional hyponatremia diagnoses in service members occurred at a rate of 7.4 per 100,000 person-years. Females, younger individuals, and recruits faced higher risks, with rates varying by military branch and ethnicity.
Area of Science:
- Military Medicine
- Environmental Health
- Sports Medicine
Background:
- Exertional hyponatremia is a potentially serious condition linked to excessive water intake during physical exertion.
- Understanding incidence trends and risk factors is crucial for preventive strategies in active populations.
Purpose of the Study:
- To determine the incidence rates and trends of exertional hyponatremia among active component service members from 2004 to 2019.
- To identify demographic, military branch, and racial/ethnic groups with higher risks.
Main Methods:
- Retrospective analysis of incident diagnoses of exertional hyponatremia.
- Surveillance data from active component service members between 2004 and 2019.
- Calculation of crude incidence rates per 100,000 person-years.
Main Results:
- A total of 1,612 diagnoses were recorded, with an overall incidence rate of 7.4 per 100,000 person-years.
- Higher incidence rates were observed in females, individuals under 20, and recruit trainees.
- Incidence varied significantly by military branch (highest in Marine Corps) and race/ethnicity (highest in Asian/Pacific Islander and non-Hispanic white service members).
- Annual incidence peaked in 2010 and showed fluctuations, with elevated rates in 2015 and 2019.
Conclusions:
- Exertional hyponatremia poses a significant risk to service members, particularly certain demographic and occupational subgroups.
- Education on appropriate water intake limits during physical activity in hot, humid conditions is essential for prevention.