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Psychophysiological responses of the elderly to outdoor thermal stress: A focused analysis
Urban Climate ( IF 6.0 ) Pub Date : 2024-08-09 , DOI: 10.1016/j.uclim.2024.102094 Xiaoyan Ma , Jiayi Lin , Aowei Liu , Xiaohui Nian , Bo Hong
Urban Climate ( IF 6.0 ) Pub Date : 2024-08-09 , DOI: 10.1016/j.uclim.2024.102094 Xiaoyan Ma , Jiayi Lin , Aowei Liu , Xiaohui Nian , Bo Hong
Outdoor activities are known to enhance the health of elderly adults, but their physiological and psychological responses to outdoor thermal stresses remain unclear. Our study assessed these responses under thermal stress conditions in typical open spaces in Xi'an, China, employing subjective questionnaires, physiological metrics, and electroencephalogram monitoring. We found that after the stress test: 1) mean thermal sensation vote (MTSV) escalated in increments of 0.36, 0.53, 1.09, and 1.12, while mean thermal comfort vote (MTCV) experienced decrements of 0.16, 0.17, 0.91, and 1.14 under no, slight, moderate, and strong thermal stresses, respectively. 2) The systolic pressure reduction (ΔSBP) and diastolic pressure reduction (ΔDBP) exhibited “U”-shaped patterns, with nadirs at 0.27 and −2.33 under moderate thermal stress. During the stress recovery phase, ΔSBP and ΔDBP exhibited minimum values of −7.06 and −5.19 under slight thermal stress. 3) The vigilance and arousal index (β/θ + α) peaked under strong thermal stress during the recovery phase. 4) The frontal EEG asymmetry (FEA) increased under slight thermal stress (0.13), but decreased under moderate (0.14) and strong thermal stress (0.12) during recovery phase. These insights aid bioclimatic design of open spaces for vulnerable groups, particularly the elderly.
更新日期：2024-08-09
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