Effect of Mindfulness Versus Loving-kindness Training on Leukocyte Gene Expression in Midlife Adults Raised in Low-Socioeconomic Status Households.

Objectives: People raised in low socio-economic status (SES) households are at an increased risk for physical illness in adulthood. A shift in gene expression profiles in the immune system is one biological mechanism thought to account for elevated disease susceptibility, with a frequently-investigated profile being the conserved transcriptional response to adversity (CTRA), characterized by increased expression of proinflammatory genes and decreased expression of antiviral and antibody-related genes. Methods: The present study investigated, in a sample of at-risk midlife adults (N = 88), whether those randomized to learn loving-kindness meditation (LKM) in a 6-week workshop, would show a reduction in CTRA gene expression, compared to those randomized to learn mindfulness meditation (MM). We assessed emotions daily and hypothesized positive emotions to account for the expected effect of LKM on gene expression. Results: Results showed significant group differences from pre- to post-intervention, yet in the opposite direction as hypothesized: Participants randomized to the MM group showed significant declines in CTRA gene expression, whereas those in the LKM group showed significant increases in CTRA gene expression. Both groups showed increases over the 6 weeks in daily reports of positive emotions, b=.007, p <.001 alongside decreases in negative emotions b=-.005, p <.001. Thus, positive emotions were not pursued as a candidate mediator of observed group effects. Conclusion: This study is the first to examine whether the biological impact of childhood low-SES can be reversed in mid-life through meditation interventions. Results suggest mindfulness meditation may be a viable option for improving health outcomes in this at-risk population. Trial Registration: ClinicalTrials.gov NCT02400593.

Loving-kindness meditation slows biological aging in novices: Evidence from a 12-week randomized controlled trial.

Combinations of multiple meditation practices have been shown to reduce the attrition of telomeres, the protective caps of chromosomes (Carlson et al., 2015). Here, we probed the distinct effects on telomere length (TL) of mindfulness meditation (MM) and loving-kindness meditation (LKM). Midlife adults (N = 142) were randomized to be in a waitlist control condition or to learn either MM or LKM in a 6-week workshop. Telomere length was assessed 2 weeks before the start of the workshops and 3 weeks after their termination. After controlling for appropriate demographic covariates and baseline TL, we found TL decreased significantly in the MM group and the control group, but not in the LKM group. There was also significantly less TL attrition in the LKM group than the control group. The MM group showed changes in TL that were intermediate between the LKM and control groups yet not significantly different from either. Self-reported emotions and practice intensity (duration and frequency) did not mediate these observed group differences. This study is the first to disentangle the effects of LKM and MM on TL and suggests that LKM may buffer telomere attrition.

Positive Emotion Correlates of Meditation Practice: A Comparison of Mindfulness Meditation and Loving-kindness Meditation.

The purpose of this study was to uncover the day-to-day emotional profiles and dose-response relations, both within-persons and between-persons, associated with initiating one of two meditation practices, either mindfulness meditation or loving-kindness meditation. Data were pooled across two studies of midlife adults (N = 339) who were randomized to learn either mindfulness meditation or loving-kindness meditation in a six-week workshop. The duration and frequency of meditation practice was measured daily for nine weeks, commencing with the first workshop session. Likewise, positive and negative emotions were also measured daily, using the modified Differential Emotions Scale (Fredrickson, 2013). Analysis of daily emotion reports over the targeted nine-week period showed significant gains in positive emotions and no change in negative emotions, regardless of meditation type. Multilevel models also revealed significant dose-response relations between duration of meditation practice and positive emotions, both within-persons and between-persons. Moreover, the within-person dose-response relation was stronger for loving-kindness meditation than for mindfulness meditation. Similar dose-response relations were observed for the frequency of meditation practice. In the context of prior research on the mental and physical health benefits produced by subtle increases in day-to-day experiences of positive emotions, the present research points to evidence-based practices - both mindfulness meditation and loving-kindness meditation - that can improve emotional wellbeing.