Effects of exercise in the cold on blood clotting and platelets1

Journal/Book: Reprinted from JOURNAL OF APPLIED PHYSIOLOGY Vol. 20 No. 3 May 1965. 1965;

Abstract: The Children's Hospital of Winnipeg and University of Manitoba Winnipeg Manitoba Canada Received for publication 20 July 1964 1This study was supported in part by the Manitoba Heart Foundation. The tendency to blood clotting as measured by Lee-White clotting time (CT) partial thromboplastin time (PTT) and platelet adhesiveness (PAC) was studied in io normal subjects before and after a standardized bicycle exercise done at 25 C inside and at an average temperature of -20 C outside. Inside exercise caused a shortening of CT from 674 to 465 sec of PTT from 88 to 78 sec and PAC increased from 65 000/mm3 to 185 000/mm3; P < .05 for all tests suggesting an increased tendency to blood clotting. In contrast exercise done in the cold produced no significant changes in these parameters. Heart rate rectal temperature and changes in plasma proteins were similar for both types of exercise. ___MH

Keyword(s): platelet adhesiveness clotting time

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