Many recreational and elite runners participate in distance races each
year. When these events are conducted in hot or cold conditions, the
risk of environmental illness increases. However, exertional hyperther
mia, hypothermia, dehydration, and other related problems may be minim
ized with pre-event education and preparation. This position stand pro
vides recommendations for the medical director and other race official
s in the following areas: scheduling; organizing personnel, facilities
, supplies, equipment, and communication; providing competitor educati
on; measuring environmental stress; providing fluids; and avoiding pot
ential legal liabilities. This document also describes the predisposin
g conditions, recognition, and treatment of the four most common envir
onmental illnesses: heat exhaustion, heatstroke, hypothermia, and fros
tbite. The objectives of this position stand are: 1) To educate distan
ce running event officials and participants about the most common form
s of environmental illness including predisposing conditions, warning
signs, susceptibility, and incidence reduction. 2) To advise race offi
cials of their legal responsibilities and potential Liability with reg
ard to event safety and injury prevention. 3) To recommend that race o
fficials consult local weather archives and plan events at times likel
y to be of low environmental stress to minimize detrimental effects on
participants. 4) To encourage race officials to warn participants abo
ut environmental stress on race day and its implications for heat and
cold illness. 5) To inform race officials of preventive actions that m
ay reduce debilitation and environmental illness. 6) To describe the p
ersonnel, equipment, and supplies necessary to reduce and treat cases
of collapse and environmental illness.