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Exertional Hyponatremia occurs during or up to 24 hours after prolonged physical activity. It is defined by a serum, plasma or blood sodium concentration below 135 millequivalents per liter. This infographic provides an update on Exertional Hyponatremia among U.S. Armed Forces, information on service members at high risk. Exertional hyponatremia can result from loss of sodium and/or potassium as well as relative excess of body water. There were 1,519 incident diagnoses of exertional hyponatremia among active component service members from 2001 through 2016. 86.8 percent were diagnosed and treated without having to be hospitalized. 2016 represented a decrease of 23.3 percent from 2015. In 2016, there were 85 incident diagnoses of exertional hyponatremia among active component service members and 77.6 percent of exertional hyponatremia cases affected males.  The annual rate was higher among females. Service members age 40 and over were most affected by exertional hyponatremia. High risk service members of exertional hyponatremia were: •	Females •	Service members aged 19 years or younger •	White, non-Hispanic and Asian/ Pacific Islander service members •	Recruit Trainees •	Marine Corps members Learn more at www.Health.mil/MSMR

Exertional Hyponatremia occurs during or up to 24 hours after prolonged physical activity. It is defined by a serum, plasma or blood sodium concentration below 135 millequivalents per liter. This infographic provides an update on Exertional Hyponatremia among U.S. Armed Forces, information on service members at high risk. Exertional hyponatremia can result from loss of sodium and/or potassium as well as relative excess of body water.

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Armed Forces Health Surveillance Branch | Physical Activity

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