Adults with asthma who received mindfulness training showed significant improvement in symptoms compared to those who did not receive such training, based on data from 73 individuals.
Although previous research shows the contribution of psychological factors to poor asthma control and exacerbations, the ability of mindfulness-based stress reduction (MBSR) to improve asthma symptoms in particular has not been well studied, wrote Estelle T. Higgins, BA, of the University of Wisconsin, Madison, and colleagues.
they wrote. The researchers hypothesized that MBSR training would reduce the effect of psychological distress on asthma control and inflammation compared to asthma patients in a waitlist control group.
In a study published in Brain, Behavior, & Immunity – Health, the researchers randomized 38 adults with asthma to a program of MBSR and 24 to a waitlist. The participants ranged in age from 18 to 65 years, with a mean of 38.1 years, and 43 were female. All patients had an asthma diagnosis for at least 6 months; airway inflammation was based on measures of fraction of exhaled nitric oxide (FeNO) ≥ 30 ppb, 138 blood eosinophil count ≥ 150 cells/mcL, or percent sputum eosinophils ≥ 2% of total leukocytes. Individuals with ongoing medical conditions other than asthma were excluded.
The MBSR group had seven clinical data collection visits at approximately 1-month intervals. MBSR training sessions occurred within classes offered to the community over a period of 8 weekly sessions and one 6-hour retreat, and included breath-focused attention, body scan, and mindful awareness in seated positions, walking, and yoga. Participants completed questionnaires about mindfulness, distress, depression, and anxiety symptoms. These were assessed at baseline, post intervention, and at study completion. Chronic stress level was determined at baseline only.
The primary outcome was asthma control based on the Asthma Control Questionnaire 6-item version (ACQ6) Minimally Important Difference.
Overall, asthma control improved significantly among those randomized to MBSR compared to waitlisted controls (P = .01) and this difference persisted at 4 months after the intervention.
Nearly one-third (32%) of the MBSR participants met the criteria for clinically significant improvement in asthma symptoms, compared to 12% of those on the wait list.
In addition, MBSR-related improvement in asthma control was significantly associated with a reduced distress (P = .043), and was especially effective for individuals with the highest levels of depressive symptoms at baseline, the researchers noted. Individuals who received MBSR also showed significantly reduced levels of exhaled nitric oxide compared to waitlist controls (P < .05).
The study findings were limited by the lack of an active control group, the researchers noted. “Though a wait-list control group was employed to control for variation in outcome measures over time, it is possible that effects reported here were driven by factors that are not specific to training in mindfulness, such as social support or expectancy effects,” they wrote. However, the results support the value of mindfulness in reducing psychological stress, FeNO, and impairments related to asthma that were sustained over time, they said. The results also support the potential of MBSR to both augment and reduce the need for pharmacological treatment in asthma, and mindfulness may be an effective way to improve overall disease control by reducing the contribution of psychological factors to asthma morbidity, they concluded.
The study was supported by the National Center for Complementary and Integrative Health. Coauthor Richard J. Davidson, MD, is the founder and president, and serves on the board of directors for the nonprofit organization, Healthy Minds Innovations Inc. The researchers had no financial conflicts to disclose.