在現今的社會形態中，坐式生活型態加重了國人的身體活動量不足的情況。目前已有許多提升身體活動量的應用程式，運用社群互動的元素，如:查看他人的成績、分享個人成績、傳送訊息等功能來提升人們的身體活動量，排行榜亦為其中一種被廣泛運用在遊戲、應用程式中的社群互動元素。然而，過去的社群影響相關研究尚未明確指出社群行為趨勢是如何影響個人行為表現討論。在實驗中，我們透過實驗控制虛擬參與者行走步數的趨勢，發現在每日步數進步的社群的大多數參與者都有更多的步行數量，而每日步數退步的所有參與者都比之前有更少的步行數量。透過半結構式訪談，近一步了解使用者可能在過程中產生社會比較及社會學習的歷程，而這些歷程可能是自身未必察覺的，在潛移默化中改變人們的意圖和行為。根據實驗對於虛擬社群的初步探討後，我們了解虛擬社群顯示於排行榜確實可能對於使用者有所影響。這項研究的結果可為促進身體活動相關的應用程式，在設計社群獎賞或排行榜機制時，提供一些設計建議，以提升使用者的體活動量。

In recent years, many people's life style has gradually become sedentary, and therefore lack of physical activity. While there are many applications that encourage physical activity through social interaction, such as rankings, sharing, or messaging. Few of them have shown that community trends can help people do more physical activity. Here, we created fictitious communities with different trends to investigate how different community trends affect users. In experiment 1, we found that most of the participants in the growth community had more walking steps and all participants in the decline community had fewer walking steps than before. The fictitious community trend displayed through the leaderboards might allow our participants to experience the process of social learning and social comparisons implicitly and then change their intentions and behaviors. The results of this study provide some design implications for building fictitious communities in mobile applications to encourage users to do more physical activity.

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