因为踮脚时双侧小腿后部肌肉的收缩挤压，会促进锻炼者下肢血液的回流，加速血液循环，可防止下肢静脉曲张。

Because when tiptoe, the bilateral muscle of calfs can contract and squeeze, will promote the exerciser by the return of lower extremity blood, accelerate blood circulation, prevent varicose veins.

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虽然在身体任何部位都可发生，但一般多见于肢体，如上肢前臂、手掌和手指部位的动静脉，下肢的膝部、小腿和足的动、静脉。

Directly, Although in any part of the body, but are more common in general upper limb, such as the forearm and hand fingers and parts of the extremities, arteriovenous knee, crus and foot and vein.

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结果：彩色多普勒超声检查出小腿静脉血栓22例，4例行下肢静脉造影的结果与超声诊断相符。

Results:22 cases of deep venous thrombosis in the leg were diagnosed by CDFI. 4 cases of them were performed venographies that match to CDFI's.

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