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Background: Sedentary behavior is highly prevalent in older adults transitioning to retirement. Sedentary time is all of the time spent in sedentary behavior, and prolonged sedentary time is associated with an increased risk of noncommunicable diseases. The aim of this study was to explore perceptions among older adults transitioning from working life to retirement regarding selfmanagement strategies for reducing sedentary time and adhering to the reduced sedentary time. Methods: Twenty-eight older adults, age 60-75 years, participated in one of four focus group interviews. Qualitative content analysis was used to analyze the data. Results: The analysis resulted in the theme " It has to be my way," and the three categories " Activities scattered with joyfulness," " Support for changes in everyday life," and " Health affects willingness and ability, and is affected by adherence." Conclusions: Interpreted from the perspective of self-determination theory, self-management strategies for reducing sedentary time should be adaptable as every individual is unique, indicating a need for autonomy. Sedentary time was said to be reduced by activities that evoked joyfulness, and joyfulness was considered to increase adherence. Support for changes to one's everyday life was considered necessary. The support that was mentioned primarily involved targeting cognitive determinants such as self-efficacy and attitudes. This new knowledge can be included when designing self-management interventions; however, more research is needed in order to evaluate whether self-management strategies targeting autonomous motivation and affective determinants, such as affective judgment and cognitive determinants, can reduce sedentary time in those who are in the transition to retirement.

Background: Having a great amount of sedentary time is common among older adults and increases with age. There is a strong need for tools to reduce sedentary time and promote adherence to reduced sedentary time, for which eHealth interventions have the potential to be useful. Interventions for reducing sedentary time in older adults have been found to be more effective when elements of self-management are included. When creating new eHealth interventions, accessibility and effectiveness can be increased by including end users as co-designers in the development process.

Objective: The aim was to explore the desired features of an eHealth intervention including self-management for reducing sedentary time and promoting adherence to reduced sedentary time in older adults transitioning from working life to retirement. Further, the aim was to develop a digital prototype of such an eHealth intervention.

Methods: The study used the participatory design approach to include end users, researchers, and a web designer as equal partners. Three workshops were conducted with 6 older adults transitioning to retirement, 2 researchers, and 1 web designer. Thematic analysis was used to analyze the data from the workshops.

Results: Participants expressed a desire for an easy-to-use eHealth intervention, which could be accessed from mobile phones, tablets, and computers, and could be individualized to the user. The most important features for reducing sedentary time were those involving finding joyful activities, setting goals, and getting information regarding reduced sedentary time. Participants expressed that the eHealth intervention would need to first provide the user with knowledge regarding sedentary time, then offer features for measuring sedentary time and for setting goals, and lastly provide support in finding joyful activities to perform in order to avoid being sedentary. According to the participants, an eHealth intervention including self-management for reducing sedentary time in older adults in the transition to retirement should be concise, accessible, and enjoyable. A digital prototype of such an eHealth intervention was developed.

Conclusions: The developed eHealth intervention including self-management for reducing sedentary time in older adults transitioning to retirement is intended to facilitate behavior change by encouraging the user to participate in autonomously motivated activities. It uses several behavior change techniques, such as goal setting and action planning through mental contrasting and implementation intention, as well as shaping knowledge. Its active components for reducing sedentary time can be explained using the integrated behavior change model. Further research is needed to evaluate the feasibility and effectiveness of the eHealth intervention.