前言：過去步態不對稱的研究因為受到實驗儀器的限制下，往往都在實驗室內進行，資料收取只能收取短時間且較少的步態週期。不對稱的研究通常都收取特殊疾病患者以及運動員，針對一般健康族群在戶外長時間跑步下監測步態不對稱變化的差異情形，目前還需再更進一步的釐清。目的：本研究藉由戶外長時間的監測，觀察一般健康族群在疲勞下步態不對稱之變化差異。方法：15名受試者，使用慣性感測儀器分別置於身體的上肢、下肢、軀幹三個部位，以75%最大跑速進行30分鐘戶外跑，將收集資料換算成不對稱指數，使用重複量數單因子變異數分析觀察在長時間跑步下步態不對稱是否會有所變化。結果：發現步態不對稱的數值隨著疲勞程度的改變，而有顯著的變化差異，步態不對稱有越來越小的情形。結論： 30分鐘跑步測驗下，發現隨著疲勞程度的增加，步態不對稱現象有越來越對稱的情形。

Most of previous gait asymmetry studies collected few gait cycles in a laboratory. Besides, the research of asymmetry usually focused on patients and athletes. The change in gait asymmetry during long-time outdoor running in general health group needed to be further clarified. Purpose: To determine the effect of long-time outdoor running on gait asymmetry in general health group. Method: Fifteen participants run at 75% of maximum speed for 30-minutes outdoors. Five Inertial Measurement Unit sensors were fixed on upper limbs, lower limbs, and trunk to calculate asymmetry index. One way ANOVA with repeated measures was used to assess the change in gait asymmetry during 30-minutes running. Result: The results showed that the asymmetry index reduced with fatigue. Conclusion: The gait in general health group is more symmetry with fatigue during 30-minutes running.

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