Aim To investigate the contribution of platelet activation and the damage marker of blood vessel endothelium in stroke.Methods 300 SD rats were divided into three groups: model group,sham operated group and normal control group,the sham operated group were divided into sham operated group and sham operated+endothelium damage group;the model group were divided into hypertension group,endothelium damage group and hypertension+endothelium damage group.In the 12th week the rats were divided into artificial cold exposure(ACE) and non-ACE,only A...