Preparation for Outdoor Winter Activities Prevents Injury by The American Chiropractic Association http://www.masschiro.org/Articles.php?topic=8&story=29 When snow, ice and frigid weather blast into town, watch out, says the American Chiropractic Association (ACA). Winter recreational activities and chores can pose problems for the outdoor enthusiast whose body is not in condition. Winter sports like skating, skiing and sledding can cause painful muscle spasms, strains or tears if you're not in shape. Even shoveling snow the wrong way, clambering awkwardly over snow banks, slipping on sidewalks and wearing the wrong kinds of clothing can all pose the potential for spasms, strains and sprains. Simply walking outside in the freezing weather without layers of warm clothing can intensify older joint problems and cause a great deal of pain. As muscles and blood vessels contract to conserve the body's heat, the blood supply to extremities is reduced. This lowers the functional ca