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BackgroundAlthough physical activity is known to be beneficial to lung function, few studies have been conducted to investigate the correlation between physical activity and lung function in dusty areas. Therefore, the purpose of this study is to investigate the correlation between physical activity and lung function in a Korean cohort including normal and COPD-diagnosed participants.MethodsData obtained from the COPD in dusty areas (CODA) cohort was analyzed for the following factors: lung function, symptoms, and information about physical activity. Information on physical activity was valuated using questionnaires, and participants were categorized into two groups: active and inactive. The evaluation of the mean lung function, modified Medical Research Council dyspnea grade scores, and COPD assessment test scores was done based on the participant physical activity using a general linear model after adjusting for age, sex, smoking status, pack-years, height, and weight. In addition, a stratification analysis was performed based on the smoking status and COPD.ResultsPhysical activity had a correlation with high forced expiratory volume in 1 second (FEV1) among CODA cohort (p=0.03). While the active group exhibited significantly higher FEV1 compared to one exhibited by the inactive group among past smokers (p=0.02), no such correlation existed among current smokers. There was no significant difference observed in lung function after it was stratified by COPD.ConclusionThis study established a positive correlation between regular physical activity in dusty areas and lung function in participants.

cused cognitive behavioral therapy, cognitive processing therapy (CPT), and prolonged exposure therapy (PE). These are strongly recommended first-line therapies in major PTSD treatment guidelines. 9 Recently, Sloan and Marx' s 10 research team introduced a fivesession exposure-based PTSD treatment protocol called written exposure therapy (WET). WET is recommended for the treatment of PTSD in clinical practice guidelines (Department of Veterans Affairs/Department of Defense, 2017). Like other EBTs, it comprises critical components considered to be responsible for the successful treatment of PTSD symptoms, such as therapeutic exposure and cognitive processing/cognitive restructuring. [10][11][12] However, WET requires a smaller number of sessions, shorter session durations, and no between-session assignments. 10,13 The efficacy of WET was evaluated using a randomized controlled trial, and this study reported a significant reduction in PTSD symptom severity at the post-treatment follow-up, and symptom reduction was maintained three and six months later with 7% of drop-out rate. 14 A study that directly compared WET

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