Regional difference in the incidence characteristics of heat disorder

• Published in: Nihon Seikishō Gakkai zasshi Vol. 43; no. 1; p. 23
• Main Authors: Iriki, Masami, Hashimoto, Masaaki
• Format: Journal Article
• Language: English
• Published: Izumo City Japan Science and Technology Agency 01.01.2006
• ISSN: 0389-1313; 1347-7617

Heat Disorder in Yamanashi Prefecture for 10 years (1995-2004) and in Hokkaido Prefecture for 5 years (2000-2004) were investigated. The number of patients reported of July and August in the investigation years was 579 (Yamanashi) and 174 (Hokkaido). The number of patients increased as a day-maximum-temperature goes up. On the time of occurrence of heat disorder and, increasing and decreasing of the number of patients developed, a constant tendency was not seen in ten years. The heat disorder was observed from 27°C of a day-maximum-temperature, and became remarkable at 33-36°C, that was same for the investigation period of ten years. The graph of the age group of patients in Yamanashi showed two peaks at a young (teens) and an aged (sixties-eighties) generation. Heat disorder in young generation occurred mainly in outdoor activities (exercise or working). On the other hand, heat disorder of aged group has been generated in routine activities of daily life regardless of indoor or outdoor, and the indoor events tended to be generated in aged people who are suffering from other diseases. A peak of the young generation was not obvious in Yamanashi during 3 years in 10 years, coinciding with the cases in Hokkaido for 5 years. Thus the 2 peaks in the graphs of the number of heat disorder incidence of each generation have to be investigated further.