TAI-TE SUBarclay, RuthRuthBarclayMoineddin, RahimRahimMoineddinSalbach, Nancy MNancy MSalbach2026-01-022026-01-022025https://scholars.lib.ntu.edu.tw/handle/123456789/734985Diverse strategies are needed to reduce frailty. This study evaluated the effects of two behavioural interventions targeting outdoor walking on reducing the level of frailty among community-dwelling older adults with mobility limitations. Methods Data from two participant cohorts of the Getting Older Adults Outdoors (GO-OUT) study were analyzed. After baseline evaluations, 190 participants were invited to a one-day educational workshop and were then randomized to either a 10-week supervised outdoor walk group (n=98) or a 10-week telephone weekly reminders group (n=92). Frailty was assessed using Fried’s frailty index at 0, 3, and 5.5 months. Mixed-effects linear and ordinal regression models were used to evaluate change in frailty score and phenotype over time after accounting for age, sex, study site, participation on own or with a partner, and cohort. Results At baseline, participant mean age was 74.5±7.1 years; 73% were female, 7% were frail, and 59% were pre-frail. Total frailty scores decreased, on average, by 0.13 points (b=–0.13, 95% CI: –0.26 to –0.01; p=.036) across all participants from 0 to 3 months (immediately post-intervention). Participants were 55% less likely to progress to more severe frailty phenotypes at 3 months compared to baseline (OR=0.45; 95% CI: 0.25 to 0.81; p=.008). No significant between-group differences or long-term effects were observed. Conclusions A short-term reduction in frailty was observed in older adults with mobility limitations following participation in behavioural interventions aimed at improving outdoor walking; neither intervention was superior. Supervised outdoor walk group and telephone weekly reminder interventions to increase outdoor walking may have the potential to mitigate frailty in older adults with mobility limitations.en[SDGs]SDG2[SDGs]SDG3[SDGs]SDG5journal article10.1371/journal.pone.032392340938877