MAYWOOD, IL – It’s always important to be conscious of weather conditions when you exercise, but especially when it comes to extreme heat.

“Heat injury can be life-threatening. If you take the right precautions, there is no reason you can’t get in some great outdoor exercise, even though the thermostat is on the rise,” said Pietro Tonino, MD, director of sports medicine at Loyola University Health System.

Sweat stains on our shirts and shorts aren’t pretty, but sweat is integral to keeping us healthy in the heat, Dr. Tonino said.

“Sweat is our body’s way of cooling off. But as we perspire, we lose necessary body fluids, which leads to dehydration. When we become dehydrated, we lose the ability to sweat appropriately and become susceptible to heat injury. There are many factors that can lead to injury and need to be considered before exerting yourself on a hot day,” said Dr. Tonino.

To help avoid injury, Dr. Tonino offers this advice:

  1. Humidity affects how easily sweat evaporates from skin. Sweat must be evaporated to cool off the body. When humidity is 60 percent or greater, it is difficult for sweat to evaporate into the air.

  2. Clothing choice is just as important when exercising in the summer months as in the winter months. Dark clothing absorbs heat and can drastically increase the chance of heat stress.

  3. Sun exposure can lead to skin cancer and increase your body temperature. So be sure to slather on the screen and reapply it every two hours. Also look for shaded places to exercise to help keep your core temperature down.

  4. Acclimatization allows our body time to adjust to the heat. So, take is slow at first and make sure you’re in good health before exerting yourself in the heat.

  5. Age is an important consideration. Children have a more difficult time adjusting to the heat than adults do and are less effective at regulating body heat. So, take extra care with kids in the heat.

  6. Dehydration, even in mild levels, can hurt athletic performance. If you don’t have enough fluids, you can’t effectively cool yourself off.

  7. Drinking water is a must before you head outdoors to exercise. If you are dehydrated before beginning your exercise routine, you are at greater risk for heat injury. Make sure you are hydrated before, during and after exercising in the heat.

  8. High body fat levels make it more difficult for a body to cool itself off.

  9. Medications such as diuretics and stimulants can increase your risk of heat injury so check with your doctor if you are taking any medications before exercising in the heat.

  10. Fevers already have caused the body temperature to rise. If you have a fever or recently had a fever you should not exercise in the heat. Your core body temperature is already high and this leaves you susceptible to heat injury.

The most severe type of heat injury is heat stroke which can happen suddenly and can be deadly. When suffering a heat stroke your body can’t cool itself. Your core temperature can rise to 104 degrees F causing organ system failure.

“If you think someone is suffering from heat stroke, call 911 immediately. Then, move them out of the sun and cool them off with cold towels, fans or an ice bath, if available,” said Dr. Tonino.

To avoid this extremely dangerous condition, prevention is critical. Here are a few tips:


  1. Break frequently to rest and rehydrate. This is essential to prevent heat injury.

  2. Make sure you are hydrated, but not overly hydrated. Drink when you feel thirsty and monitor your urine output. The darker your urine the less hydrated you are. Drink enough fluids to keep your urine a very light color. Overhydrating can be dangerous as well so the best way to know is to listen to your body and drink when you are thirsty.

  3. Weigh yourself before and after activity to monitor water loss. Make sure you have replaced fluids before your next exercise session.

  4. Gradually increase activity in the heat over a period of 7-10 days to allow adequate acclimatization.

  5. Wear light-colored clothing and sunscreen

  6. Schedule outdoor exercise during the coolest times of day, either early in the morning or after sunset.

“So, beat the heat and enjoy these warm days. All too soon we’ll be giving sledding tips,” said Dr. Tonino.

For media inquiries, please contact Evie Polsley at epolsley@lumc.edu or call 708-216-5313 or 708-417-5100. Follow Loyola on:

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About Loyola University Health System
Loyola University Health System (LUHS) is a member of Trinity Health. Based in the western suburbs of Chicago, LUHS is a quaternary care system with a 61-acre main medical center campus, the 36-acre Gottlieb Memorial Hospital campus and more than 30 primary and specialty care facilities in Cook, Will and DuPage counties. The medical center campus is conveniently located in Maywood, 13 miles west of the Chicago Loop and 8 miles east of Oak Brook, Ill. At the heart of the medical center campus is a 559-licensed-bed hospital that houses a Level 1 Trauma Center, a Burn Center and the Ronald McDonald® Children's Hospital of Loyola University Medical Center. Also on campus are the Cardinal Bernardin Cancer Center, Loyola Outpatient Center, Center for Heart & Vascular Medicine and Loyola Oral Health Center as well as the LUC Stritch School of Medicine, the LUC Marcella Niehoff School of Nursing and the Loyola Center for Fitness. Loyola's Gottlieb campus in Melrose Park includes the 255-licensed-bed community hospital, the Professional Office Building housing 150 private practice clinics, the Adult Day Care, the Gottlieb Center for Fitness, Loyola Center for Metabolic Surgery and Bariatric Care and the Loyola Cancer Care & Research at the Marjorie G. Weinberg Cancer Center at Melrose Park.



About Trinity Health Loyola University Health System is part of Trinity Health, a national Catholic health system with an enduring legacy and a steadfast mission to be a transforming and healing presence within the communities we serve. Trinity is committed to being a people-centered health care system that enables better health, better care and lower costs. Trinity Health has 84 hospitals and hundreds of continuing care facilities, home care agencies and outpatient centers in 21 states and 89,000 employees.

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