PT - JOURNAL ARTICLE AU - Renato Paceli AU - Aretusa Cardoso AU - Matheus Cavalcanti de Sá AU - Mauro Walter Vaisberg AU - Naomi Kondo Nakagama AU - Mario Terra-Filho AU - Dirce Maria Trevisan Zanetta AU - Ubiratan de Paula Santos TI - Outdoor exercise with different PM<sub>2.5</sub> concentrations and heart rate variability effects in healthy individuals, São Paulo, Brazil AID - 10.1183/13993003.congress-2016.PA4286 DP - 2016 Sep 01 TA - European Respiratory Journal PG - PA4286 VI - 48 IP - suppl 60 4099 - http://erj.ersjournals.com/content/48/suppl_60/PA4286.short 4100 - http://erj.ersjournals.com/content/48/suppl_60/PA4286.full SO - Eur Respir J2016 Sep 01; 48 AB - Introduction: Studies showing that regular exercise practice decrease or delay the incidence of chronic diseases. The exposure to pollutants increase the incidence of diseases, and make exercise in polluted environments increase the inhalation of pollutants.Aims: To evaluate effect of outdoor exercise in heart rate variability (HRV) on places with different concentrations of pollutants in healthy individuals.Methods: 60 young healthy that cater on Brazilian Army, underwent to evaluation of HRV before, during and after performing physical activities (7.5 km running), in two different days in a public street circuit (PSC) and on wooded park circuit (PkC). Heart Rate (HR) and HRV during rest, exercise and recovery were recorded by Polar RS800 equipment. PM2.5, temperature and relative humidity were monitored.Results: Fifty-eight volunteers concluded the study protocol. Age: 19.2 (1.1) years, BMI: 23.3 (2.3) kg/m2, HR rest: 69.3 (10.3) bpm. PM2.5 concentration was 24.5 (12.9) µg/m3, in PkC and 74.8 (41.5) µg/m3, in PSC. Mean HR during exercise was 161.8 (11.4) and 159.9 (12.2) bpm in PkC and PSC, respectively (p=0.029). During exercise, in both circuits, the HRV parameters had significant falls. The regression analysis, using with mixed effect models, showed that reduction of the SDNNindex during exercise was more expressive in PSC than PkC, which decreased 78.3% x 74.2%, respectively (p&lt;0.0001) and also smallest average HR during the exercise on PkC (p=0.0017).Conclusion: Young healthy volunteers presented greatest effect on the autonomic imbalance when performing physical exercise on the environment with higher concentrations of PM2.5.