Lack of this element above all others can hinder performance and lead to more serious complications. A fluid loss of as little as 2-3 percent of body weight impairs performance. Fluid losses of 7-10 percent of body weight will lead to heat stroke and death. Research shows that endurance athletes who are involved in physical activity for more than an hour and a half can produce up to three quarts of sweat per hour. That equals a loss of 6 pounds of body weight.
Fluid replacement is a special concern for children involved in sports activities.
Children have lower sweating capacity and they tolerate temperature extremes less efficiently than adults. Young children also produce more heat during exercise. They typically take two to three days longer to get used to exercise during warm weather. Keep the water bottle handy during all sports activities for children. Even better, don't let your children leave home without it.