Heat Illnesses - Risks

In a recent article for MomsTEAM, sports nutrition expert Nancy Clark discussed the subject of over-hydration (hyponatremia). MomsTEAM's sports hydration expert weighs in with some additional thoughts.

With the summer sports season in full swing and preparation for fall sports participation and training around the corner, it's time to revisit the guidelines for athletes with sickle cell trait.

Most healthy children and adolescents can safely participate in outdoor sports and other physical activities in a wide range of challenging warm to hot weather, but there are numerous factors that put them at increased risk of exertional heat illness.

After birth every baby is tested for a wide variety of conditions and diseases. One of the tests looks for the condition called "Sickle Cell Trait."  Ordinarily, a relatively benign condition, sickle cell trait can have potentially devastating implications for youth  engaged in sustained, intense exercise, such as in sports practices, which can result in a life-threatening condition called exertional sickling.

Symptoms of impending heat illness include chills, nausea, headache, disorientation, and muscle cramping.

While deaths of football players from heat stroke are down (with only one during 2012-2013, compared to 5 in 2011 alone), eat stroke is an ever present concern in the sport because, according to an 2008 study by researchers at University of Florida, there are eight factors that make football players especially vulnerable to heat illness.

Youth football coaches should adopt practice modifications and employ a strategy to acclimatize players to perform in the heat, along with a fluid replacement strategy in anticipation of young players who begin practice already dehydrated, according to new recommendations from the American College of Sports Medicine (ACSM), the world leader in the scientific and medical aspects of sports and exercise. The guidelines are outcomes from a recent expert panel convened for an ACSM scientific roundtable on youth football and heat stress.

Extremely hot or humid weather may require that sports practices or games be modified or even cancelled because of the risk of heat illness. In deciding whether to do so, you should keep in mind that hot, dry weather can be extremely dangerous. Because sweat evaporates very quickly in such conditions, your child won't feel sweaty, and neither you nor your child may recognize how much water he or she has lost. As the relative humidity increases, the effectiveness of sweating in cooling the body also decreases. When the relative humidity is high, sweat drips off the skin so that the cooling benefit of evaporation is lost even at cooler temperatures, resulting in a build-up of body heat.