有一位患动脉硬化的老人每天早晨打太极拳,近来经常感到头晕,便摇摆颈部想使头脑清醒。结果事与愿违,头晕更加明显,甚至在活动颈部时,还常常眼前发黑。实际上,老人的这些症状是大脑供血不足所致,而活动颈部使大脑缺血更加严重,甚至影响到了眼睛的血液供应,出现眼前发黑和暂时性 One elderly person suffering from atherosclerosis who practices tai chi every morning has often felt dizzy lately, shaking his neck and waking his head. The result was contrary to expectations, dizziness even more apparent, even in the activities of the neck, often black eyes. In fact, these symptoms of the elderly are caused by inadequate blood supply to the brain, and the active neck causes more severe brain ischemia and even affects the blood supply to the eyes, causing immediate blackouts and temporary