Biomedicine and Sports Science Research Group, Edinburgh Napier University, Merchiston Campus, 10 Colinton Road, Edinburgh, EH10 5DT, UK.
Eur J Appl Physiol. 2010 Sep;110(1):199-205. doi: 10.1007/s00421-010-1485-8. Epub 2010 May 7.
Large urbanized areas, where sports events take place, have a polluted environment and can also reach high temperatures and humidity levels. The aim of this study was to investigate the impact of a hot, humid and ozone-polluted (O(3)) environment on (1) performance of an 8 km time trial run, (2) pulmonary function, and (3) subjective respiratory symptoms in endurance-trained runners. Using crossover randomized design, 10 male participants (mean V(O)₂(max)= 64.4 mlO(2) kg(-1) min(-1), SD = 4.4) took part in a time trial run under four different conditions: 20 degrees C + 50% relative humidity (rh) (Control), 20 degrees C + 50% rh + 0.10 ppm O(3) (Control + O(3)), 31 degrees C + 70% rh (Heat), 31 degrees C + 70% rh + 0.10 ppm O(3) (Heat + O(3)). Heart rate, ratings of perceived exertion and minute ventilation were collected during the run. Lung function was measured pre and post-exercise. The runners completed a respiratory symptoms questionnaire after each trial. The completion time of both the Heat (32 min 35 s) and Heat + O(3) (33 min 09 s) trials were significantly higher (P < 0.0001) when compared to the Control + O(3) (30 min 27 s) and Control (30 min 15 s) trials. There were no significant changes between pre/post lung function measures or between trials. The effective dose of ozone simulated in the present study did not affect the performance and therefore, ozone-pollution, at an environmentally relevant concentration, did not compound the impairment in performance beyond that induced by a hot, humid environment.
大城市地区举办体育赛事，其环境通常受到污染，而且气温和湿度也可能很高。本研究旨在探讨炎热、潮湿和臭氧污染（O(3)）环境对（1）耐力跑运动员 8 公里计时赛表现、（2）肺功能和（3）主观呼吸症状的影响。采用交叉随机设计，10 名男性参与者（平均 V(O)₂(max)=64.4mlO(2)kg(-1)min(-1)，标准差=4.4）在四种不同条件下进行计时赛：20°C+50%相对湿度（rh）（对照）、20°C+50%rh+0.10ppmO(3)（对照+O(3)）、31°C+70%rh（热环境）、31°C+70%rh+0.10ppmO(3)（热环境+O(3)）。运动过程中收集心率、感知用力程度评分和分钟通气量。运动前后测量肺功能。每位运动员在每次试验后完成一份呼吸症状问卷。与对照+O(3)（30 分 27 秒）和对照（30 分 15 秒）相比，热环境（32 分 35 秒）和热环境+O(3)（33 分 09 秒）的试验完成时间明显更长（P<0.0001）。肺功能测量值前后之间或各试验之间均无显著差异。在本研究中模拟的有效臭氧剂量未影响运动表现，因此，在环境相关浓度下，臭氧污染不会加重由炎热、潮湿环境引起的运动表现受损。
