Effect of Temperature, Relative Humidity and Physical Activity on B

Temperature and relative humidity are as major factors that stimulate exercise-induced bronchospasm (EIB). The purpose of this study was to investigate the effect of environmental temperature and relative humidity on the EIB in the pre-test and 5, 10, 15 and 60 minutes (1 hour) after the activity in the exercise (EXEG) and control (CONG) groups. Among 60 adolescent male students of Sport and Physical Education School after performing a standard test, 24 subjects which had maximal oxygen uptake 2.4±55.6 ml.minG . kgG selected as 1 1 the study group. Then the subjects were randomly divided into two exercise (n=12) and control (n=12) groups. One hour after facing with temperature and relative humidity, peak Expiratory Flow Rate (PERF) of groups taken before and 5, 10, 15 and 60 minutes after performing the test. Dependent and independent t-test used to comparing PERF at pre-test and post-test also between two groups. EIB occurrence rate calculated according to 15% dropping on PEFR after exercise. Results showed that the most rate of EIB observed 5 and 15 minutes after exercise test in training group (58% and 41.66% respectively). In addition, no significant differences observed between PEFR before and after performing the test in two groups (P>0.05). The minimum correlation of PEFR observed 10 minutes after exercise in the EXEG. Thus, exercise at temperature of 15 Celsius degrees and relative humidity 50% causes occurrence of EIB in 29.8% athletes and 12.49% in non-athletes only to be faced with this situation. It was concluded that exercise activity in abnormal conditions(cool conditioning) by normal children can cause pulmonary abnormalities(EIB). Therefore,we recommended the implementation of activities under these conditions to be avoided. Abbreviations: EIB: Exercise-Induced BronchospasmEXEG % Exercise Group -CONG % Control Group VO2max % Maximal Oxygen Uptake-VO % Peak Oxygen Consumption-PEFR % Peak Expiratory Flow 2peak Rate-NS % No Significant