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(Arteriosclerosis, Thrombosis, and Vascular Biology. 1997;17:1682-1686.)
© 1997 American Heart Association, Inc.

Articles

Effects of Short-term Exercise on Female Platelet Function During Different Phases of the Menstrual Cycle

Jong-Shyan Wang; Chauying J. Jen; Hwei-Ling Lee; ; Hsiun-ing Chen

From the Departments of Physiology (J-S.W., C.J.J., H-i.C.) and Public Health (H-L.L.), National Cheng-Kung University Medical College, Tainan, Taiwan, R.O.C.

Correspondence to Dr. Hsiun-ing Chen, Department of Physiology, College of Medicine, National Cheng-Kung University, Tainan, Taiwan 701, Republic of China. Email hichen{at}mail.ncku.edu.tw

Abstract Previous studies have shown that premenopausal women have a low incidence of cardiovascular diseases, and that acute exercise affects male platelet function in an intensity-dependent manner. To investigate whether acute exercise affects female platelet function differently from males, sixteen sedentary women in the midfollicular phase or midluteal phase received strenuous or moderate exercise on a bicycle ergometer. Before and immediately after exercise, platelet adhesiveness, adenosine diphosphate-induced platelet aggregation and intracellular calcium concentration elevation, platelet cAMP and cGMP contents, urinary 11-dehydro-TXB₂ and 6-keto-prostaglandin F1 levels, and plasma nitric oxide metabolite level were determined. Our results showed no differences in exercise performance and in resting platelet function between two menstrual phases, with little change in urinary eicosanoid metabolites and platelet cAMP levels under all experimental conditions. In addition, for women in the midfollicular phase, (1) strenuous exercise increased platelet adhesiveness, adenosine-diphosphate-induced platelet aggregation, and intracellular calcium concentration elevation, whereas moderate exercise suppressed them; (2) moderate exercise enhanced plasma nitric oxide metabolite and platelet cGMP levels. In contrast, none of these platelet functions was affected by acute exercise in the midluteal phase. Therefore, we conclude that acute exercise affects female platelet function in an intensity-dependent manner in the midfollicular phase but not in the midluteal phase. The irresponsiveness of platelets to acute exercise in the luteal phase may partially explain why premenopausal women have a lower incidence of cardiovascular diseases than men.

Key Words: exercise • endothelium-derived factors • calcium • platelets • menstrual cycle

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