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  • Title: Effects of exercise training and deconditioning on platelet aggregation induced by alternating shear stress in men.
    Author: Wang JS, Li YS, Chen JC, Chen YW.
    Journal: Arterioscler Thromb Vasc Biol; 2005 Feb; 25(2):454-60. PubMed ID: 15569820.
    Abstract:
    OBJECTIVE: Alternating shear stress, which resembles the flow condition in stenotic arteries, induces platelet aggregation. This study investigated how exercise training and deconditioning influence alternating shear-induced platelet aggregation (ASIPA) and clarify the mechanisms underlying ASIPA. METHODS AND RESULTS: Thirty healthy male sedentary subjects were randomly divided into control and trained groups. The trained men were trained on a bicycle ergometer at approximately 60% of maximal oxygen consumption for 30 minutes per day, 5 days per week for 8 weeks, and then were deconditioned for 8 weeks. The experimental results indicate the following: (1) short-term strenuous exercise increases the extent of ASIPA and is accompanied by increased the von Willebrand factor (vWF) binding and P-selectin expression on platelets in both the control and trained groups, whereas the enhancement of platelet function decreases after exercise training in trained subjects; (2) at rest and immediately after exercise, ASIPA and the vWF binding and P-selectin expression on platelets are reduced by training, but remain unchanged in the control group; and (3) deconditioning reverses the effects of training on resting and postexercise state. CONCLUSIONS: Exercise training suppresses the extent of ASIPA, probably by reducing vWF binding to platelets and P-selectin expression on platelets. However, deconditioning reverses the training effects. This investigation shows that exercise training decreases resting and severe exercise-promoted platelet aggregation induced by alternating shear stress (ASIPA); moreover, this effect is accompanied by reduced the von Willebrand factor binding and P-selectin expression on platelets. However, the effects of training on ASIPA are reversed to the pretraining state after deconditioning.
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