AN ANALYSIS OF MENTAL WORKLOAD AT HIGH-ELEVATED WORK PLACES (2) - MEASUREMENT OF PHYSIOLOGICAL RESPONSES
Egawa, Y., National Institute Industrial Safety, Independent Administrative Institution and Usui, S., Osaka University, Japan
In Japan, the number of fatalities in construction accidents occupied 38.7% of total industrial accidents in 2000. In case of falling accidents, the number of fatalities occupied 41.1% of construction accidents. Furthermore, about 20% of falling fatalities were caused by falling from high-elevated work places like scaffoldings. So in order to establish the ergonomic countermeasures against falling accidents, an analysis of mental workload for workers on scaffolding was carried out by measurement of physiological responses. Main results of this report were as follows: (1)At the result of measurements of electro-myogram (EMG), footing boards widths of wider than 16 inches were necessary for the reduction of physiological load on the legs; (2)At walking on high-elevated footing boards for scaffolding workers, footprint- angles of 30 degrees or more outsides were observed. It was considered that these walking postures were stable against the side of impact; (3)Since the scaffolding frame heights were about 5 feet 7inches in Japan, the forward-bent walking postures with 30-45 angles were observed for the workmen of 6 feet height or more.