Investigating performance and lung function in a hot, humid and ozone-polluted environment.
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.
Gomes
Elisa Couto
EC
Biomedicine and Sports Science Research Group, Edinburgh Napier University, Merchiston Campus, 10 Colinton Road, Edinburgh, EH10 5DT, UK. elisacoutogomes@gmail.com
Stone
Vicki
V
Florida-James
Geraint
G
D000293:Adolescent; D000328:Adult; D000393:Air Pollutants / Q000009:adverse effects*; D018592:Cross-Over Studies; D005541:Forced Expiratory Volume; D006339:Heart Rate; D006358:Hot Temperature; D006801:Humans; D006813:Humidity; D008297:Male; D008450:Maximal Midexpiratory Flow Rate; D010126:Ozone / Q000009:adverse effects*; D010366:Peak Expiratory Flow Rate; D010465:Perception; D010807:Physical Endurance; D012123:Pulmonary Ventilation; D012129:Respiratory Function Tests; D012420:Running; D011795:Surveys and Questionnaires; D014797:Vital Capacity; D055815:Young Adult
D000393:Air Pollutants; D010126:Ozone
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