跑步腿奇痒难忍

It usually occurs during exercise performed after a long period of inactivity. The itching is not on the skin, it’s inside the actual limbs. There are millions of tiny capillaries and arteries inside our muscles which expand rapidly due to the demand for more blood that is brought on by exercise. When fit, these capillaries remain open allowing maximum blood passage, but when unfit and inactive they tend to collapse, allowing only minimal blood passage (which is sufficient for a sedentary person however). The rapid expansion of these vessels causes adjacent nerves to send impulses back to the brain which are interpreted as an itch. That’s why after a few sessions the sensation tends to go away. Just another indication of increasing fitness levels.

1.你已经很长时间没有运动了，刚刚开始跑步，腿部的肌肉需要提供你跑步的动力，肌肉就会产热。但在肌肉紧张时刺激到皮肤，时皮肤有痒的感觉，像蚂蚁在爬。

在跑步时，下肢通过臀部肌肉、大腿前后群肌肉、小腿肌肉的交替协调收缩，完成蹬地摆腿动作；上摆臂则主要发挥维持平衡的作用，而躯干在跑步时保持收紧稳定状态，目的是为下肢摆腿、上肢摆臂提供有力支撑。因此，我们可以很清楚地发现，跑步时躯干保持不动，而上下肢以躯干为支点，不断来回摆动，这就是跑步时腰腹的表现。

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这类过敏反应除了无皮疹仅有针刺、剧痒感外，还可在躯干和肢体近端皮肤（腋、掌跖除外）出现红色的、2毫米左右的"风团"，这种风团是速来速去不留痕迹。轻型胆碱能性荨麻疹可发生在平常人青春期，一般在停止运动或平静以后，症状即可消退，故不易引起重视。整个过程可数月或数年不等，发作频繁者应及时去皮肤科诊治。经抗组胺药、抗乙酰胆碱的药物治疗，病情可减轻或缓解。