From the Trainer

This month officially marks the start of the summer season. I hope all of you have cool vacations planned that include lots of physical activities. As the temperatures rise through the summer, it becomes extremely important to monitor when, where and how much exercise you should be doing along with hydrating properly.

Did you know that water accounts for more than 60% of the human body’s volume? Water is so vital to life that we can survive only about three days without it depending upon climate conditions. The hotter and more humid the environment, the faster we become dehydrated. It takes as little as a two percent change in body weight to negatively affect exercise performance. For a 150 lb person, that equates to only 3lbs!

There are many factors that affect your hydration status such as: • Ambient Air Temperature (Outside) • Humidity • Individual Sweat Rates • Body Temperature (Internal) • Exercise Intensity & Duration • Fitness Level • Individual Body Fat Percentage • Existing Health Conditions such as cystic fibrosis, diabetes, kidney failure, etc.

Dehydration can have several negative effects during exercise such as decreased muscle strength & endurance, coordination, mental acuity, and impaired thermoregulation. One of the most important functions of water within the body is to help regulate body heat. When the body is properly hydrated, exercise will feel easier and you will typically have a lower heart rate at the same intensity than you would if you were in a dehydrated state. This is due to optimal blood volume and cardiac output to deliver nutrients and oxygen to your working muscles.

There is no single “Gold Standard” for measuring hydration levels because too many factors play into how your body stores water. However, here are some general exercise and hydration guidelines to follow this summer: • Try to workout during the coolest part of the day if outside (usually mornings) • Weigh yourself before & after your workout • Drink about 10 ounces of fluid 1 hour before your workout • Drink 8 ounces of fluid every 15 minutes during exercise • Drink 20 ounces of fluid per pound of weight lost through sweat after exercise • Always finish with a cool-down by gradually decreasing intensity • Use a cool, damp towel on the neck to help bring body temperature down • It’s better to have a sports drink (Gatorade, PowerAde, Propel) to replace electrolytes (mainly sodium) after a prolonged workout over 60 minutes About the Author: Unverzagt holds a Bachelor of Science degree in Wellness Management from Black Hills State University. He is a certified Strength & Conditioning Specialist through the National Strength & Conditioning Association and a Registered Diagnostic Cardiac Sonographer through the American Registry for Diagnostic Medical Sonography.

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