Identifying the Initiation of Oshikatsu and Health-Promoting Activities Through Oshikatsu Among Older Adults: A Trajectory Equifinality Approach.

Oshikatsu, supporting a specific individual or group, has been linked to enhanced well-being and physical activity motivation. However, few studies have explored how this practice begins, particularly among older adults. This study applied the Trajectory Equifinality Approach (TEA) to investigate how individuals aged 50 and above initiate oshikatsu and subsequently engage in health-promoting activities, and to identify influencing factors. Semi-structured interviews were conducted with nine participants (men and women aged in their 50s-80s), and their narratives were analyzed using TEA. Six phases were identified: formative experience, encounter, event participation, social interaction, lifestyle improvement, and psychological fulfillment. Social enablers that facilitated these processes included relatives or friends who were fans, regular performances, venues close to home, understanding from family members, and disposable income. This study highlights that identifying with one's oshi serves as an intrinsic motivator for initiating health-promoting activities.