[A-AS01] 東アジアの異常天候・都市災害と気候変動との関わり

[AAS01-02] Was cognitive performance indoors affected by a short walk in heat-stressful outdoor environments in an urban setting?

*浅野 裕樹¹、中村 祐輔²、鈴木パーカー 明日香³、相場 祥平¹、日下 博幸² (1.筑波大学大学院、2.筑波大学、3.立正大学)

キーワード：屋外暑熱環境、熱ストレス、認知能力、睡眠不足、被験者実験、気象観測

Office workers and students in Japan routinely move between air-conditioned indoor environments and heat-stressful outdoor environments in summer. It is possible that a short walk in the outdoor environment affects workers’ and students’ cognitive performance. However, it is unclear. This study aimed to investigate the effect of walking in a heat-stressful outdoor environment on indoor cognitive performance. In the experiments, a total of 96 participants took a mathematical addition test in an air-conditioned room before and after walking in an actual outdoor environment. Results of the experiments showed that walking outdoors under heat-stressful conditions (UTCI≧44°C) for 15 minutes decreased the cognitive performance (percentage of correct answers to numbers of problems solved) by 3.6% compared with that before walking. An analysis focusing on sleep duration showed a negative relationship between sleep duration and the decrease in cognitive performance. This tendency became particularly clear among the participants whose sleep duration was less than 5 hours. The reduction of cognitive performance was more pronounced in male participants than in female participants. Sleep-deprived men who walk in a heat-stressful outdoor environment are more likely to exhibit poor cognitive performance when they return to an air-conditioned room. Japanese office workers and students, especially men, need to be aware of this as they work and study.