Investigation has been made on logging work and so called Donaggio's fatigue caused by the work in Naguri-mura, Iruma-gun, Saitama Prefecture from 1957, and following conclusions were obtained.
1. This village is noted for forestry, particularly for logging cedars and cypresses as its main products, and villagers concerned in this industry are found to occupy 70 of the population.
2. According to annual investigation made on two workers in the forestry, they labour from 310 to 320 days in the course of one year (1957), take 2.5-3.3 days off per month on the average, and thus are estimated to work in the forestry from 23.7 to 21.3 days a month on the average. This generally indicates a little more number of working days than that of farming in the rural community.
3. Examination on substance of logging operation demonstrates that workers make a great difference among substance of operation and number of work days. The annual investigation made on two workers shows the same results in their transport of lumbers. However, it is reported that the one requires more days for mowing grasses, while the other requires more days for felling trees. As to operation of seven workers in July, most of days are spent in mowing grasses, and then in transport of lumbers. The requirement of much days for mowing grasses suggests the peculiarity of forestry in this village.
4. Working time generally covers from 8 to 10 hours, but differs according to the month, resulting in a great number of hours between June and September. Moreover, 10-12 hours are needed for the working time including one required to commute to workshops. So far as working time is concerned with, this kind of operation means heavy labor.
5. The result from Donaggio's reaction on the fatigue generally shows low titer before the operation. As to monthly variations.
Donaggio's reaction indicates high titer in summer. Especially, as workers make it a rule to get up before five o'clock a. m. in this season, D.R. shows high titer, and this means the remaining fatigue of the former day. D.R. before and after the operation indicates greatly high titer in summer. So far as Donaggio's reaction goes, the logging work is said to produce fairly high degree of fatigue
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