Adding Anodal Transcranial Direct Current Stimulation to Mindfulness Meditation Abolishes Mindfulness-Induced Improvements in Emotion Regulation in Fibromyalgia: A Responder Analysis.

A 4-week mindfulness-based intervention (MBI) improved emotion regulation in people with fibromyalgia, and those who responded clinically to the MBI showed better emotion regulation for six weeks. Adding anodal transcranial direct current stimulation (tDCS) of the primary motor cortex during mindfulness meditation eliminated this improvement. In the sham tDCS group, responders to the combined intervention reported larger gains in emotion regulation than nonresponders, but no such difference appeared in the active tDCS group. The authors conclude that combining mindfulness meditation with M1-tDCS should be reconsidered as a therapy for emotion regulation in fibromyalgia.

Study at a glance

Abstract

Mindfulness-based interventions (MBIs) appear to improve emotion regulation (ER) in disorders involving emotional dysregulation like fibromyalgia (FM). Despite the therapeutic potential of transcranial direct current stimulation (tDCS) in FM, its concurrent application with mindfulness meditation (MM) has not yet been explored. Potential synergistic effects may arise from aligning neural mechanisms underlying both interventions. This study evaluated the impact of a 4-week MBI and a combined tDCS and MM intervention on ER, implementing a responder analysis approach for FM patients. Following the MBI, 40 participants with FM were randomly allocated to receive 10 days of 20 minutes MM combined with either anodal tDCS of the primary motor cortex (M1) or sham tDCS. ER was gauged using a composite score integrating 4 self-report questionnaires. We performed assessment at 6 time points (baseline, post-MBI, immediately postcombined intervention, 4 wk, 8 wk, and 12-wk follow-ups). Clinical responders were defined as patients exhibiting a clinically relevant reduction in FM symptom load. Responders to the MBI showed better ER than nonresponders, lasting for 6 weeks. Interestingly, responders to the combined intervention in the sham group reported larger improvements in ER than nonresponders, which was not observed in the anodal tDCS group. No significant interaction between responder status and time was found for responders to either intervention. Our findings evidence that mindfulness practice is able to improve ER in FM. However, the add-on combination of MM with M1-tDCS abolishes this mindfulness-induced effect. Therefore, based on our data, combining MM and M1-tDCS must be reconsidered as a therapeutic intervention targeting ER in FM.