【空气较差都可做运动】运动期间呼吸急促，呼吸次数和深度均会增加，有机会吸入更多汙染物。若居住于空气汙染较严重的地区，应怎样权衡做运动和空气汙染的利害？学院一项涉及逾38万人的大型长期研究显示，即使在空气汙染相对严重的地区，恆常运动较不运动仍可减少自然死亡风险33%。
研究由学院劳向前副教授领导，博士后研究员郭萃博士为论文第一作者。团队于2001至2016年间于台湾招募38万多名成人，结果显示，即使台湾的PM2.5浓度较世界卫生组织建议上限高1.6倍，有恆常运动的组别死亡风险仍然低于缺乏运动的组别。
研究亦发现，接触较少PM2.5的人，死亡风险亦较低。综观所有因素，同时恆常运动及接触较少PM2.5人士，死亡风险最低，他们比缺乏运动及接触较高水平PM2.5的组别，死亡风险低46%。
劳向前教授表示，恆常运动可降低身体炎症反应水平，于空气汙染较严重的地区做运动，效益虽然未及空气洁淨的地方，但比起不做运动仍可减低自然死亡风险。本港空气汙染程度与台湾相若，劳教授建议，若空气质素健康指数(AQHI)属中等，仍可安全在户外做运动；若当天空气汙染较严重，则可考虑改到室内运动，以减少吸入汙染物。
研究结果刊于《加拿大医学会期刊》，全文：https://www.cmaj.ca/lookup/doi/10.1503/cmaj.202729
Regular exercise, even performed in areas with air pollution, can reduce the risk of death from natural causes, according to JCSPHPC’s new research in Canadian Medical Association Journal (CMAJ).
The large scale longitude study led by Professor Xiang Qian Lao was conducted between 2001 and 2016 with 384,130 adults in Taiwan. The team found that high levels of habitual exercise and low levels of PM2.5 exposure are associated with lowest risk of death and that habitual exercise reduced the risk of death across PM2.5 categories, compared to inactivity. The risk of natural death among the high exercise group with high PM2.5 is 33% less than the inactive group with high PM2.5.
“Habitual exercise reduces the risk of death regardless of exposure to air pollution, and air pollution generally increases the risk of death regardless of habitual exercise. Thus, habitual exercise should be promoted as a health improvement strategy, even for people residing in relatively polluted areas,” the authors concluded. Dr Guo Cui, a Postdoctoral Fellow of JCPHPC and the first author of the article, further added that indoor exercise is recommended when concentrations of air pollutants are severe.
Full article: https://www.cmaj.ca/lookup/doi/10.1503/cmaj.202729
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