Study: NCT01619930

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: Physical activity without motivational interviewing
Description: Focus is on physical exercise, motivated by research findings that it has a positive effect on depressive symptoms. An individualized exercise program is constructed, to be followed by the respective participant. A user-friendly pulse watch will be mailed to participants. Exercise is monitored through online self-registration with automated feedback.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: Physical activity without motivational interviewing
Description: Focus is on physical exercise, motivated by research findings that it has a positive effect on depressive symptoms. An individualized exercise program is constructed, to be followed by the respective participant. A user-friendly pulse watch will be mailed to participants. Exercise is monitored through online self-registration with automated feedback.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: Physical exercise with motivational interviewing
Description: Focus is on physical exercise, motivated by research findings that it has a positive effect on depressive symptoms. An individualized exercise program is constructed, to be followed by the respective participant. A user-friendly pulse watch will be mailed to participants. Exercise is monitored through online self-registration with automated feedback. An initial motivational interview (MI) per telephone is also conducted, to explore the intrinsic motivation to change in participants.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: Physical exercise with motivational interviewing
Description: Focus is on physical exercise, motivated by research findings that it has a positive effect on depressive symptoms. An individualized exercise program is constructed, to be followed by the respective participant. A user-friendly pulse watch will be mailed to participants. Exercise is monitored through online self-registration with automated feedback. An initial motivational interview (MI) per telephone is also conducted, to explore the intrinsic motivation to change in participants.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: Behavioral activation with rationale
Description: A behavioral activation program, based on the TRAP-TRAC model according to which suffering individuals are trapped in a vicious circle of avoidance and ever fewer reinforcers, leading to increasing discomfort. To break free of this vicious circle, patients have to replace avoidance patterns with alternative coping strategies. Unlike previous applications of this program done in the U.S., this study will feature an internet-based administration. Approximately 15 minutes of electronic therapist support will be included per week.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: Behavioral activation with rationale
Description: A behavioral activation program, based on the TRAP-TRAC model according to which suffering individuals are trapped in a vicious circle of avoidance and ever fewer reinforcers, leading to increasing discomfort. To break free of this vicious circle, patients have to replace avoidance patterns with alternative coping strategies. Unlike previous applications of this program done in the U.S., this study will feature an internet-based administration. Approximately 15 minutes of electronic therapist support will be included per week.