At the yearly Rottnest Channel Swim in Western Australia, participants often smear their bodies with animal fat for insulation against the 70-degree water. But their own body fat also helps to keep them warm, like an extra layer of clothing beneath the skin. When scientists studied aspects of the event in 2006, they found that swimmers with a greater body mass index (BMI) appear to be at much lower risk of getting hypothermia.
Under certain conditions, though, overweight people might feel colder than people of average weight. That’s because the brain combines two signals—the temperature inside the body and the temperature on the surface of the skin—to determine when it’s time to constrict blood vessels (which limits heat loss through the skin) and trigger shivering (which generates heat). And since subcutaneous fat traps heat, an obese person’s core will tend to remain warm while his or her skin cools down. According to Catherine O’Brien, a research physiologist with the U.S. Army Research Institute of Environmental Medicine, it’s possible that the lower skin temperature would give fatter people the sense of being colder overall. http://www.shop-orthopedics.com/ossur_custom_cti_knee_brace_p/b-11650001x.htm
Apply a hot-water bottle or a towel wet with hot water on the same painful area. Hot therapy increases blood flow and the amount of oxygen in the injured area and consequently stimulates the healing. It kills pain and also reduces muscle spasms.