Road sports safety, dehydration risks, and misconceptions about medications in fitness.

Being hit by a car, like a heart attack, is particularly common among long-distance runners and cyclists. It is extremely dangerous for runners and cyclists to run alongside vehicles at night while wearing black clothing. To exercise safely on the road: remember that cars are bigger, heavier, and harder than you; always assume drivers haven't seen you, as some drivers may feel they have the legal right to hit runners, especially after sunset; avoid running on the road at night; if you must run after dusk, wear light-colored clothing, a fluorescent vest and armband, or wear a fluorescent badge in an easily visible location. Carry a small flashlight to alert oncoming cars; run towards vehicles, not alongside them, and be aware of cars in the wrong lane; run on the side of the road so vehicles don't have to change course; carry your ID, especially when running alone. Dehydration is a serious problem caused by intense exercise, especially in hot weather. A marathon runner can sweat up to 8 liters. Drinking 8 glasses of cool water daily before and during long periods of exercise can prevent dehydration. Drinking small amounts of water during exercise will not cause cramps in your legs and other parts of your body. Don't wait until you're thirsty to drink water. In extremely hot conditions, thirst is not a reliable indicator of the body's need for water. The body absorbs cold water faster than fluids containing electrolytes. "Athlete's drinks" containing potassium, sodium, and chloride are not essential, except for marathon runners or those training intensely in hot weather. To accelerate water absorption, even marathon runners should dilute these drinks and avoid consuming extra salt or salt tablets, as this will increase thirst and worsen dehydration. Athletes should wear loose, comfortable clothing. They should avoid wearing vinyl or glued sportswear, as these hinder sweat evaporation and cooling, raising body temperature and increasing the risk of heatstroke, collapse, or even death. Some mistakenly believe that glued sportswear enhances weight loss, but this is merely water weight that will quickly return. Inappropriate technique can also lead to injuries. For example, race walkers should land heel-first, then toe-first; landing on the big toe first can cause leg problems such as shin splints. Develop good running habits. When running, look at the horizon ahead. If you look at the fork in the road or other objects ahead, running will be easier and less strenuous. Gravity-reversing slings were originally designed to reduce pressure on the intervertebral discs by suspending the head. Gravity-reversing slings are also used to relieve back pain and muscle tension. This device can increase intraocular pressure, thus threatening vision, raise blood pressure, and increase pulse rate. It is particularly dangerous for people with high blood pressure, cardiovascular disease, glaucoma, and related conditions. There are better ways to relieve back pain: strengthen abdominal muscles by lying flat on the floor and raising your legs. Anabolic steroids, human growth hormone, stimulants such as amphetamines and cocaine, and other drugs can improve athletic performance and treat muscle and other tissue damage caused by long-term training. Adding blood or injecting red blood cells into athletes is also said to increase the oxygen-carrying capacity of the blood and enhance endurance; however, due to safety and ethical considerations, the US Olympic Committee has officially banned their use. They are not worth using in competitive sports until their benefits and risks are determined. Amphetamines are also dangerous because they prevent athletes from knowing when to slow down, causing overexertion injuries. Historically, athletes have wondered whether sexual activity affects athletic performance, or whether high-intensity training affects sexual activity (the latter can sometimes affect sexual interest due to fatigue). Experts point out that engaging in sexual activity the night before a competition is harmless, provided you: are accustomed to doing so; believe it is harmless; and get enough sleep. Many health clubs and fitness centers offer saunas and steam rooms. Saunas are at 180°F and 15% humidity; steam rooms are at 120°F and 98% humidity; and tub baths are at 104°F. The recreational value of these facilities far outweighs their health benefits. Sitting in a dry, hot sauna or a humid, hot steam room allows the body to rest, the mind and muscles to relax, and then a shower or soak in the tub may leave you feeling refreshed. However, physiologically speaking, saunas and steam rooms offer little benefit beyond sweating, pore cleansing, and increased blood circulation in the skin. They do not, as advertised, improve health, aid weight loss, clear acne, treat arthritis, or cure the common cold. Saunas and steam rooms also cannot treat muscle injuries or relieve fatigue. The primary purpose of saunas and steam baths is to induce sweating. However, sweating carries hidden dangers: weight loss due to sweating is only temporary, as it's caused by dehydration. If you lose more than two pounds due to sweating, you are at risk of dehydration and should immediately replenish fluids. Saunas also pose a risk of heatstroke. In the first 2-4 minutes, your skin heats up, followed by your body and internal organs. When you reach your heat tolerance limit, you will experience fever, difficulty breathing, and a rapid heartbeat. You may feel unwell and leave the bath before experiencing dehydration, dizziness, fainting, or collapse, or heatstroke. Saunas can also cause other injuries, including burns due to inadequate temperature control, fungal infections, athlete's foot, and "sauna bather's disease." Although people with heart disease, high blood pressure, and diabetes should undergo a doctor's check-up before taking a sauna, most people can enjoy it without harm, as long as: drink plenty of water before and after the sauna; initially, do not exceed 5-10 minutes, and at most do not exceed 20 minutes; avoid saunas after exercise, meals, smoking, or drinking alcohol; remove watches, rings, and other jewelry, as they can cause burns due to overheating during the sauna; and do not exercise while in the sauna.