Citation

Roberts WO, Dorman JC, Bergeron MF. Med. Sci. Sports Exerc. 2015; 48(5): 785-789.

Affiliation

1Department of Family Medicine and Community Health, University of Minnesota, Minneapolis, MN; 2Sanford Sports Science Institute, Sanford Health, Sioux Falls, SD; 3Youth Sports of the Americas, Birmingham, AL; 4Lemak Health, Birmingham, AL.

Copyright

(Copyright © 2015, Lippincott Williams and Wilkins)

DOI

10.1249/MSS.0000000000000847

PMID

26694842

Abstract

Exertional heat stroke (EHS) occurs in distance runners and is a life-threatening condition. A 30-year-old healthy recreational male distance runner (CR) collapsed at the 12-mile mark in two half marathon races six weeks apart in fall 2009. In both episodes, CR was found on the ground confused, incoherent, sweaty, and warm-to-touch. The emergency medical team responded and he was cooled empirically for EHS en route to the emergency department. In the emergency department, rectal temperatures were 40°C and 40.5°C for each episode, respectively. The first race start temperature was 16°C with a 94% relative humidity (RH), and the second was 3°C, 75% RH. Heat tolerance test (HTT) was within normal range indicating low EHS risk. A race simulation test (environmental chamber 25°C, 60% RH) at a treadmill pace of 10.5-12.9 km·h was stopped at 70 minutes coincident with a rectal temperature 39.5°C. CR's body weight dropped 3.49 kg with an estimated sweat loss of 4.09 L and an estimated total sweat Na loss of 7610 mg. We recommended that he limit his runs to <1 h and replace salt and fluid during and (mostly) after activity, run with a partner, acclimate to heat before racing, and reduce his pace or stop at the first sign of symptoms. Race simulation testing should be considered in athletes with recurrent EHS to assist with the return-to-activity recommendation.

Language: en