Heat Cramp 3 : Medicine. Muscular spasms common in people who work vigorously in the heat, caused by a reduction in the concentration of sodium chloride in the blood.
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}