The Jockey Club School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong, China.
Nuffield Department of Medicine, University of Oxford, Oxford, UK.
Int J Behav Nutr Phys Act. 2022 Jun 14;19(1):68. doi: 10.1186/s12966-022-01285-1.
Physical activity is an important factor in premature mortality reduction, non-communicable disease prevention, and well-being protection. Climate change will alter temperatures globally, with impacts already found on mortality and morbidity. While uncomfortable temperature is often perceived as a barrier to physical activity, the actual impact of temperature on physical activity has been less well studied, particularly in China. This study examined the associations between temperature and objectively measured physical activity among adult populations in five major Chinese cities.
Aggregated anonymized step count data was obtained between December 2017-2018 for five major Chinese cities: Beijing, Shanghai, Chongqing, Shenzhen, and Hong Kong. The associations of temperature with daily aggregated mean step count were assessed using Generalized Additive Models (GAMs), adjusted for meteorological, air pollution, and time-related variables.
Significant decreases in step counts during periods of high temperatures were found for cold or temperate climate cities (Beijing, Shanghai, and Chongqing), with maximum physical activity occurring between 16 and 19.3 °C. High temperatures were associated with decreases of 800-1500 daily steps compared to optimal temperatures. For cities in subtropical climates (Shenzhen and Hong Kong), non-significant declines were found with high temperatures. Overall, females and the elderly demonstrated lower optimal temperatures for physical activity and larger decreases of step count in warmer temperatures.
As minor reductions in physical activity could consequentially affect health, an increased awareness of temperature's impact on physical activity is necessary. City-wide adaptations and physical activity interventions should seek ways to sustain physical activity levels in the face of shifting temperatures from climate change.
体力活动是减少过早死亡、预防非传染性疾病和保护健康的重要因素。气候变化将改变全球气温，对死亡率和发病率已经产生影响。虽然人们通常认为不舒适的温度是体力活动的障碍，但温度对体力活动的实际影响研究较少，特别是在中国。本研究调查了中国五个主要城市成年人群中温度与体力活动之间的关系。
2017 年 12 月至 2018 年期间，收集了中国五个主要城市（北京、上海、重庆、深圳和香港）的匿名汇总计步数据。使用广义加性模型（GAMs）评估温度与每日平均总步数之间的关联，调整了气象、空气污染和时间相关变量。
在寒冷或温带气候城市（北京、上海和重庆），高温期间的步计数显著下降，最佳体力活动发生在 16-19.3°C 之间。与最佳温度相比，高温时每天的体力活动减少了 800-1500 步。对于亚热带气候城市（深圳和香港），高温时未发现明显下降。总体而言，女性和老年人的最佳体力活动温度较低，在温暖的天气中步计数下降幅度较大。
体力活动的微小减少可能会对健康产生影响，因此有必要提高对温度对体力活动影响的认识。城市范围的适应和体力活动干预措施应寻求在气候变化导致温度变化的情况下维持体力活动水平的方法。
