本研究以Heintzman與Mannell (2003) 所發展的模型為基礎，實證於參與非營利組織之志願服務者(志工)，同時考量認真休閒者之堅毅特質，欲測試志工之休閒承諾是否在其休閒動機與休閒結果之間扮演著中介變數的角色。本研究首先依據文獻進行模式界定與提出二組對立模式，其次調查288位非宗教志工之問卷，運用線性結構關係模式進行模式識別，並且探討認真型休閒者之休閒動機、休閒承諾、休閒精神效益與精神福利等構念間的關係；最後，以158位宗教型志工來驗證模式之概化效度。研究結果證實二組志工的休閒承諾確實在假設的模型中成為完全中介的角色，本文的貢獻為：將Heintzman與Mannell (2003)的研究模型延伸至認真型休閒的理論，以針對「認真型休閒行為」提出一套較適宜的理論模式。最後依據本研究之發現，提供非營利組織於志工招募與訓練等建議。

This research was based on the model that was developed by Heintzman ＆ Mannell (2003). The targets of this study were the volunteers of nonprofit organizations. The persistency of volunteers was particularly considered. This research tested if leisure commitment is a mediator between leisure motivation and leisure outcomes. First, this research was in accord with literature in order to specify a hypothetical mode, and proposes two rival models, second, the model developed examines 288 non-religious volunteers to identify the fit of proposed model. Structural equation modeling using LISREL was employed to test the relationships among leisure motivations, leisure commitment and leisure outcomes. Finally, the model generalization wad demonstrated among the samples of 158 religious volunteers. Results revealed leisure commitment serves as a critical mediator in hypothetical model in the two groups. The contribution of this study is to extend Heintzman and Mannell’s model of serious leisure theory, and proposes a suitable theory model for serious leisure participants. Finally, the results provide some suggestions about recruitment and training volunteers for nonprofit organizations.