App-Based Mindfulness Training Shows Gender Differences in Emotional Benefits

Women who completed four weeks of daily app-based mindfulness training reduced their angry reactions with a medium-to-large effect size (Cohen's d = −0.56, p < 0.001). Men on the identical program showed no significant change on that measure. That gender gap in emotional outcomes, drawn from a randomized crossover trial of 300 Japanese workers, anchors one of the clearest subgroup signals to emerge from the growing body of research on digital mindfulness-based interventions.

The trial was conducted by Koichiro Adachi, Takumu Kurosawa, and Ryu Takizawa, who recruited working adults employed at least 20 hours per week during 2022-2023 in Japan. Participants were randomly assigned to either an immediate-intervention group or a waitlist control in a crossover design. The four-week program ran through a smartphone app, with daily guided sessions built around breathing and body-scan meditations. Supplementary modules added loving-kindness and open-monitoring components. At baseline and post-intervention, the team measured perceived stress, anger, psychological flexibility, self-esteem, and multiple emotion-regulation outcomes.

The angry-reaction finding was not the only gender-differentiated result. Interaction analyses also revealed a group-by-gender effect for cognitive flexibility (p = 0.023), and simple-slope analyses showed that women gained on that measure too (p = 0.034, Cohen's d = 0.36), while men again showed no significant change. The authors call the full pattern "tentative": neither interaction survived correction for multiple comparisons, and the exploratory analyses are explicitly framed as hypothesis-generating rather than confirmatory.

Those limits are substantial, including the short duration, app-only format, non-clinical Japanese working-adult sample, and uncorrected interaction effects. But the 300-person sample and within-subject crossover design are genuine methodological strengths for this literature, and the directional consistency across two emotion-regulation facets gives the signal some weight.

For practitioners tracking their own progress inside a mindfulness app, the most concrete implication is which subskills to monitor: cognitive flexibility and angry reactions were the two measures where the brief daily program, blending body-scan, breathing, loving-kindness, and open-monitoring sessions, produced detectable change within four weeks. Adachi and colleagues call for follow-up preregistered personalization studies to test whether gender-sensitive content, different practice emphases, or adjusted session frequency could improve outcomes for participants who showed smaller gains, and whether the pattern replicates beyond its current Japanese working-adult context.