Association Between Ambient Air Pollution And Physical Activity In Chinese Adults

[Background and Objectives]Studies have shown that physical activity promotes health and is conducive to the recovery of chronic non-communicable diseases;air pollution,especially fine particulate matter,has been shown to increase the morbidity and mortality of respiratory diseases,cancer,cardiovascular disease and other diseases.Some studies have shown that the increase in air pollution can lead to an increase in physical activity and counteract the health benefits of physical activity,but there is less extensive research on the relationship between air pollution and physical activity.Especially in recent years,air pollution in China is becoming more and more serious.The association between air pollution and physical activity is of great public health significance.The purpose of this study was to analyze the relationship between PM2.5 and total physical activity and outdoor physical activity,and to assess the effects of air pollution and other factors on high physical activity.[Methods]This study was based on the baseline data of the Prospective Urban and Rural Epidemiology(PURE)in the Chinese population,combined with the data of PM2.5 and NO2 data for air pollution research.The basic situation of adult demography,physical activity and PM2.5 basic situation in different cases were described,and the differences between the groups were analyzed,and the correlation between total physical activity and outdoor physical activity and air pollution was explored using multiple logistic regression model.The ratio of the lowest number of PM2.5 four quantiles was taken as the reference to calculate the ratio of all groups of outdoor physical activity.Odds ratio(OR)and 95%confidence interval(Confidence interval,Cl)were analyzed by age and gender.[Results]The study included 109 communities with a total of 34 064 subjects.The total physical activity accounted for 46%of the total population and 52%of the outdoor physical activity group.The proportion of female outdoor physical activities was higher than that of men(53.4%vs 50.1%).People with high outdoor physical activity are relatively older than those with low physical activity.The mean annual concentration of PM2.5was 67.76±18.47μg/m3,and the average PM2.5 concentration in urban areas was much higher than that in rural areas(P<0.001).The odds ratio of high total physical activity in each group was 0.71(0.66-0.76),0.89(0.83-0.95)and 0.88(0.81-0.94)respectively,but there was no linear trend,but the ratio of risk ratio for high total outdoor physical activity in each group was 0.77(0.72-0.82),0.66(0.62-0.71),0.76(0.76),respectively.0.71-0.82),and there is a linear trend(P<0.001).According to age stratification,the highest PM2.5 concentration group(Q4:0.87(0.76-0.99))had no other group higher(Q2:0.85(0.76-0.96),Q3:0.66(0.59-0.75)).[Conclusions]Air pollution affects people’s high physical activity,and with the increase of PM2.5 average concentration,the degree of outdoor physical activity will decrease,compared with the lowest concentration of PM2.5,the other PM2 5 concentration groups were negatively correlated with the high total physical activity,but with the increase of PM2.5 concentration,there was no linear trend in the high total physical activity.At the highest PM2.5 concentration level,the degree of high outdoor physical activity is not the largest.This suggests that public health departments should do well in the prevention of physical activities under air pollution and publicity;and relevant measures should be introduced to help people to change the way of physical activity.And reduce the impact of air pollution on physical activity intensity,and then promote health,reduce the incidence and mortality of related diseases.