Mandatory Rest Stops Improve Athlete Safety during Event Medical Coverage for Ultramarathons.

Area of Science:

• Sports Medicine
• Environmental Physiology
• Extreme Event Management

Background:

• Ultramarathons in hot climates pose significant heat illness risks.
• Heat accumulation without acclimatization can lead to exertional heat stroke (EHS).
• The Jungle Marathon implemented mandatory rest periods to mitigate these risks.

Purpose of the Study:

• To evaluate the impact of mandatory rest periods on heat-related medical complications and race dropouts.
• To assess the effectiveness of rest interventions in extreme endurance events.

Main Methods:

• Retrospective review of race records from 2008-2013.
• Comparison of non-finish rates due to heat stress before and after mandatory rest periods were instituted.

Main Results:

• Pre-intervention: 21% of runners did not finish (DNF), with 54.3% of DNFs attributed to heat.
• Post-intervention: 24.3% of runners DNF, but only 15.4% of DNFs were heat-related.
• A notable decrease in the proportion of heat-related DNFs was observed.

Conclusions:

• Mandatory rest stops are effective in improving athlete safety during ultramarathons.
• Rest periods aid in the heat acclimatization process for endurance athletes in hot environments.
• This intervention is likely beneficial for similar extreme running events.