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Web-based acceptance and commitment therapy for depressive symptoms with minimal support: a randomized controlled

Päivi Lappalainen1, Sitwat Langrial2, Harri Oinas-Kukkonen2

  • 1University of Jyväskylä, Finland paivi.k.lappalainen@jyu.fi.

Behavior Modification
|August 9, 2015
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Summary

Internet-delivered acceptance and commitment therapy (iACT) significantly reduced depressive symptoms and improved psychological flexibility compared to a waiting list. These positive outcomes were sustained for 12 months, indicating iACT is an effective low-intensity intervention.

Keywords:
Internet treatmentacceptance and commitment therapydepressive symptomsminimal supportreminders

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Area of Science:

  • Psychology
  • Clinical Psychology
  • Digital Health

Background:

  • Low-intensity interventions are needed for depressive symptoms.
  • Web-based interventions offer accessible treatment options.
  • Acceptance and Commitment Therapy (ACT) is a potential framework for digital interventions.

Purpose of the Study:

  • To evaluate the effectiveness of an Internet-delivered ACT (iACT) intervention for individuals with depressive symptoms.
  • To assess the impact of iACT on depression, psychological flexibility, and mindfulness.
  • To examine the long-term maintenance of treatment effects for iACT.

Main Methods:

  • A randomized controlled trial comparing iACT to a waiting list control (WLC).
  • Participants (N=39) with depressive symptoms completed self-report measures at pre-treatment, post-treatment, and 12-month follow-up.
  • The iACT intervention involved 7 weeks of home assignments, online feedback, and automated reminders.

Main Results:

  • The iACT group showed significant improvements in depression symptomatology (g=.83), psychological symptoms (g=.60), psychological flexibility (g=.67), mindfulness (g=.53), automatic thoughts (g=.57), and thought suppression (g=.53) compared to WLC.
  • Treatment effects were maintained at 12-month follow-up, with large effect sizes for depression (g=1.33) and other measures (g=.74-1.08).
  • Participants reported high satisfaction and willingness to recommend the iACT intervention.

Conclusions:

  • Guided Internet-delivered ACT with minimal contact is an effective treatment for depressive symptoms.
  • iACT offers a sustainable and accessible low-intensity intervention option.
  • The findings support the use of digital ACT interventions for improving mental well-being.