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Objective Mindfulness interventions have been shown to reduce stress; however, the mechanisms driving stress resilience effects are not known. Mindfulness interventions aim to teach individuals how to: (a) use attention to monitor present moment experiences; with (b) an attitude of acceptance and equanimity. A randomized controlled dismantling trial (RCT) was conducted to test the prediction that the removal of acceptance skills training would eliminate stress-reduction benefits of a mindfulness intervention. Method This preregistered RCT randomly assigned stressed community adults to 1 of 3 conditions: (a) Monitor and Accept (MA) mindfulness training, a standard 8-week Mindfulness-Based Stress Reduction (MBSR) intervention that provided explicit instruction in developing both monitoring and acceptance skills; (b) Monitor Only (MO) mindfulness training, a well-matched 8-week MBSR intervention that taught monitoring skills only; or (c) No Treatment (NT) control. Stress and nonjudgment were measured using ecological momentary assessment (EMA) for 3 days at baseline and 3 days at postintervention. Results Consistent with predictions, MA participants increased in nonjudgment and decreased in both stress ratings and the proportion of assessments that they reported experiencing feelings of stress in daily life, relative to both MO and NT participants. Conclusions This RCT provides one of the first experimental tests of the mechanisms linking mindfulness interventions with stress resilience. These findings suggest that acceptance skills training may be a necessary active ingredient and support the value of integrating acceptance skills training into stress-reduction interventions. (PsycINFO Database Record (c) 2019 APA, all rights reserved).

OBJECTIVE The current study tested whether self-affirmation in the context of a threatening health message helps promote a health behavior (fruit and vegetable consumption) over a 3-month period, and whether adding a manipulation to support the translation of intentions into behavior (an implementation intentions induction) enhances the impact of self-affirmation. METHODS Participants (N = 332, 71% women) reported their baseline consumption and were randomly assigned to condition in a 2 (self-affirmation: yes, no) × 2 (implementation intentions: formed, not formed) between-subjects factorial design. They completed a self-affirmation/control task and then read a health communication advising eating at least 5 portions of fruit and vegetables daily. Next participants reported intentions for behavior change, after which they formed/did not form relevant implementation intentions. Consumption was measured again 7 days and 3 months postintervention. RESULTS Self-affirmed (vs. nonaffirmed) participants reported eating more fruit and vegetables at both follow-ups. Forming (vs. not forming) implementation intentions was also beneficial for consumption. At 7 days, there was also a significant self-affirmation × implementation intentions interaction: consumption was highest when self-affirmed participants also formed implementation intentions. CONCLUSIONS The present study offers new evidence concerning the impact and durability of self-affirmation on health behaviors and the role of implementation intentions in enhancing the impact of self-affirmation.

Objective: Everyday stressors can threaten valued aspects of the self. Self-affirmation theory posits that this threat could be attenuated if individuals affirm alternative self-resources. The present study examined whether self-affirmation would buffer cumulative stress responses to an ongoing academic stressor. Design: Undergraduate participants provided 15-hr urine samples on the morning of their most stressful examination and baseline samples 14 days prior to the examination. Participants were randomly assigned to the self-affirmation condition where they wrote two essays on important values over the 2-week period prior to exam, or a control condition. Main Outcome Measures: Samples were analyzed for urinary catecholamine excretion (epinephrine, norepinephrine), an indicator of sympathetic nervous system activation. Participants also indicated their appraisals of the examination experience. Results: Participants in the control condition increased in cumulative epinephrine levels from baseline to examination, whereas participants in the self-affirmation condition did not differ from baseline to examination. The buffering effect of self-affirmation was strongest among individuals most concerned about negative college evaluation, those most psychologically vulnerable. Conclusion: The findings demonstrate that sympathetic nervous system responses to naturalistic stressors can be attenuated by self-affirmation. Discussion centers on psychological pathways by which affirmation can reduce stress and the implications of the findings for health outcomes among chronically stressed participants.