Speed on snow. The motorized sled.
D000059:Accidents; D000063:Accidents, Traffic; D000328:Adult; D001265:Athletic Injuries / Q000453:epidemiology; D003288:Contusions / Q000453:epidemiology; D006259:Craniocerebral Trauma / Q000453:epidemiology; D005260:Female; D050723:Fractures, Bone / Q000453:epidemiology; D006801:Humans; D004204:Joint Dislocations / Q000453:epidemiology; D007869:Leg Injuries / Q000453:epidemiology; D008281:Maine; D008297:Male; D008875:Middle Aged; D013124:Spinal Injuries / Q000453:epidemiology; D013177:Sports; D013898:Thoracic Injuries / Q000453:epidemiology; D014887:Weather; D014947:Wounds and Injuries / Q000453:epidemiology*