“Charlie Horse”

A term generally believed to be from American Baseball slang. Charley “Old Hoss” Radbourn (1853-1897) was rounding third base, developed a cramp, as he limped home was asked, “What’s the matter,Charley Hoss?” and he replied; “My leg is tied up in knots!
•    The name has since stuck!
•    This fun fact tracked down from: Runner’s World.com

Anatomy of Muscle Cramps:
•    Sustained involuntary muscle spasms.
•    “True cramps” are the most common type of cramp
•    “True Cramps” are caused by hyper-excitability of the nerves that stimulate skeletal muscles.

Skeletal Muscle:
•    The tissue responsible for voluntary body movements
•    Has an abundant supply of blood vessels and nerves
•    Require nerve stimulation to function
•    Primary Function is “contraction”

Potential Causes of “True” Muscle Cramps Include:
•    Injuries
•    Vigorous Activity
•    Night Cramps (many questions exist to why one may get cramps at night)
•    Dehydration
•    Shifts in Body Fluid
•    Low blood calcium or magnesium
•    Low potassium (may be associated with weak muscles)

Prevention of:
#1 cited way to prevent “true cramps” :Avoid Dehydration
One more reason to drink up during and after a day of sailing, playing in the snow . . .a hike with the dog.