Summer means gardening, cookouts, and just enjoying the great outdoors, but a heat wave can pose a major threat, especially for seniors. “Seniors won’t have as great an ability to sweat as younger people, and sweat is how you cool yourself, explained William B. Greenough III, MD, a geriatrician and professor of medicine at Johns Hopkins University School of Medicine in Baltimore. Dehydration may increase the risk of a serious cardiovascular event like a heart attack, stroke, or kidney failure. An Australian study found that during a record-breaking heat wave, there was a significant increase in trips to the emergency room for heat-related illness and dehydration, particularly in those age 75 and older for whom the heat triggered a 13 percent increase in deaths. “It’s very important to stay well hydrated, increasing fluids and salts to accommodate for the salt losses,” Dr. Greenough said. Try these tips to keep your cool during sizzling summer days.