緒論：本研究在探討參與者左右腳穿不同大小之運動鞋的情況下，是否在雙腳鞋號皆相同時舒適度感受最佳？且舒適度評估結果，是否和參與者實際左右腳大小的差異有關。方法：本研究蒐集33位女性 (年齡:40.5±21.5歲，身高:159±11公分，體重:58±17公斤，鞋號:UK3~7號) 來做相關實驗，已事先排除足部有受過大型創傷 (例如開刀、車禍、骨折等) 與先天骨骼相關疾病。用平常穿的鞋子為基準，以半號為單位，試穿左右腳不同鞋號組合的鞋，並在三輪試穿運動後，比較選擇出其偏好的鞋號組合。最後計算評分雙腳尺寸是否達到明顯差異或是感受不同。結果:全部33位中，有18位 (55%) 選擇雙腳不同尺寸的鞋子。全部33位中，有6位 (18%) 最舒適的鞋子選擇比實際腳長較大的尺寸，而有19位 (58%) 選擇比起自己實際腳長還小的鞋子；而有20位 (61%) 實際雙腳尺寸大小不同，在這20位中有16位 (75%) 右腳尺寸大於左腳。討論與結論: 大部分的人其實雙足大小是不相同的，但坊間賣的鞋子主要還是成雙在賣，因此舒適度或許對於顧客的感受不是最佳。總結本研究發現，至少有5成以上，最舒適度鞋子其實雙腳是不同尺寸的，尤其有些受試者覺得最佳尺寸還與自己腳實際尺寸差異大於1號以上。而且，就算同樣的雙腳尺寸，每個人偏好與最舒適的鞋子尺寸也不一定一樣。未來如果鞋子要往客製化發展，單腳尺寸的製作也許可以納入考量，並同時試穿著比較，才能讓舒適度達到最佳的效益。甚至除了目前常用的半碼、半公分數為單位以外，能做到用更精細的單位來量測。

Comfort is probably the most important aspect of footwear. The difficulty is how to directly define or quantify comfort. It has been proven that many foot problems are caused by wearing inappropriate footwear. The ankle is in an unstable condition, which in turn affects the overall alignment and gait, so it is very important to wear a suitable pair of shoes. Due to the advancement of industrial technology and the change of consumption pattern, customized products are a kind of shopping pattern change and trend for consumers. However, currently the customized shoes service is mainly based on appearances and colors, but there are not many choices for the most important part of shoes, which is comfort.
Each person's foot length and shape may more or less vary , and certain elements such as the differences between dominant feet may affect the selection of the best comfort. In this study, the participants wore different sizes of sneakers on their left and right feet, but did they feel the best comfort when both feet in the same size of shoes ? Also, the study aims to understand whether the results of the comfort assessment are related to the difference between the actual sizes of the participants' left and right foot.

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