6 Ways to Protect Your Heart in Hot Weather

Keep your heart healthy when summer temperatures rise.

Updated on February 19, 2024

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You probably know winter weather can pose serious risks for your heart, but what about the summer? Hot, humid days can spell trouble, too, especially if you already have heart problems. “In general, very high heat is not good for anyone, but it is much worse for people who have heart diseases," says Devender Akula, MD, cardiologist at LourdesCare at Cherry Hill in New Jersey.

Follow these tips to protect your heart health when the temperatures soar.

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Monitor your medicines

If you take heart medication, talk with your healthcare provider (HCP) before spending extra time in the heat. Certain prescription medicines, like ACE inhibitors, beta blockers and calcium channel blockers, can intensify your body’s reaction to hot temperatures and humidity.

Be mindful, too, of diuretics (water pills), which are often used to treat high blood pressure. These reduce sodium and water in the body, in addition to what you may be losing through sweat on hot days. Don’t stop taking your medication, though: Stay cool indoors and follow your HCP's advice.

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Stay hydrated

Drinking fluids helps prevent dehydration and overheating, which make your heart work harder. Plus, your body has to release more hormones to retain salt and water, which stresses the heart even more. Drink 2 to 4 cups of water every hour when you're out in high heat.

If you’re doing intense exercise, try a sports drink to replenish sodium and potassium. Avoid sugary drinks like fruit juice, which slow the absorption of water. Caffeine and alcohol can also deplete fluids, so if you're having an iced tea or cold can of beer, have a glass of water, too.

One caution: Patients with congestive heart failure should check with their HCP, as drinking too much can do more harm than good, Akula says.

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Dress appropriately

If you have to spend a lot of time outdoors, make sure your outfit is cool and breathable. “You’ll want to wear lightweight, light-colored clothing, made of cotton. There are even some synthetic fabrics now that can repel sweat,” says Akula. Don’t forget sunglasses, a broad-brimmed hat, and well-ventilated shoes.

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Exercise with caution

What's Akula's number one piece of advice for staying safe in the heat? Steer clear of the steamiest times of day. “Typically, it's the hottest in the afternoon, around 3 or 4 o’clock,” he says. And seek shade from 10 a.m. to 2 p.m., when the sun's rays are the strongest.

If it’s very hot outside or you’re starting a new workout, gradually increase the length and intensity of your exercise over time, rather than pushing yourself too hard. Limit outdoor workouts to no more than 90 minutes and take frequent breaks to hydrate and cool off. You can even hold frozen water bottles to stay cool while you work out—as the ice melts, drink up.

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Eat smaller meals

Noshing on lighter, water-packed meals and snacks—think salads, smoothies, cold soups, and fruit—can help prevent dehydration. Small meals will also help keep your heart rate steady, and foods with a high-water content will help ensure your body temperature stays low.

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Cool off quickly

When the temperature climbs, it's important to know when you've had too much. Muscle cramps, weakness or heavy sweating can all be signs of heat exhaustion. Get inside, take a cool shower or bath or use cold compresses. “Putting ice packs in the armpits, groin area, or neck region also helps, since those are places where the major blood vessels are,” says Akula.

Call 911 immediately if you have chest pains, or if you have signs of heat stroke, including a high fever, dizziness, or confusion, a pounding heart or hot, red, dry, or moist skin.

Slideshow sources open slideshow sources

American Heart Association. Protect Your Heart in the Heat. July 31, 2015. Accessed July 6, 2022.
Centers for Disease Control and Prevention. Natural Disasters and Severe Weather: Extreme Heat. June 17, 2022. Accessed July 6, 2022.

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