探討影響手握力之因子及其在電子產品掌上型設計之應用

A study into factors affecting grip strength with application to the design of computer handsets

目的：大部份的電子產品中必需應用掌上型設計，而手部功能為主將影響產品使用的效能。因此，電子產品的操作設計必須以測量手部功能為依據之一。本研究旨在探討影響手握力的各項因子，及其在電子產品掌上型設計之應用。方法：共計251 位成人為調查樣本，以JAMAR 握力計及馬丁式游標卡尺測量手握力。採用SPSS 12.0 統計軟體分析樣本資料，分析項目包括：描述性分析、ANOVA、t-test、迴歸分析。結果：手握力隨著年齡增加而遞減，而男性握力減弱程度較女性大；post hoc 檢定顯示以4.76cm 為最有效的握距；不同手掌長度與手握力值有顯著性差異(p<0.001)。結論：手部機能衰退，肌力、敏捷性、精密性、協調性、敏感性及關節活動性等，將影響手部握持及操作產品的功能。建議電子產品的操作設計必須考量使用者個別人體尺寸及年齡的特性。

Objectives: Hand functions are important as the interface with the computer. Equipment designers need ways to measure the function of the hand. We aimed to measure changes in function of the hand, and the factors responsible, in order to aid computer handsets designers to optimise design. Methods: A sample of 251 adults was taken. Grip strength was tested, using a well calibrated JAMAR dynamometer and Martin-type anthropometer. Data were analysed by SPSS 12.0 software. Descriptive analysis, ANOVA, t-test, and regression analysis were used. Results: Grip strength is shown gradually to decline over the years, though females retain strength much better than males. Post hoc test showed grip span of 4.76cm was found to be significantly most effective. Palm length was also significantly associated with grip strength (p<0.001). Conclusions: We present a framework to establish normative values for basic hand function and for measuring variables on which it depends. This can be used by designers of computerised equipment, to predict and meet user preference.