Two top class cyclists, 23 and 24, complained of intermittent acute claudica tion at maximal effort due to a stenotic endofibrosis of the external iliac artery. Symptoms disappeared after endarterectomy and venous patch arterioplasty. This pathology is probably the consequence of repeated and long continued haemodynamic stress acting on the external iliac artery which would be respon sible, in certain subjects, for an exaggerated bend due to the sitting position of the competitor. High cardiac output and adaptive hypertension must also be of importance.
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