Environmental contaminations caused by the organochlorine pesticides (=OCPs) such as BHC and DDT, as well as PCB, are an important ecological problem relevant to their residue or accumulation in the human body.
In the present study, β-BHC, total DDT and PCB levels in the plasma of farmers in Japan, Korea and Nepal were analysed using the gaschromatograph with electron-capture detector, to know how the levels relate to the history of using those pesticides in each country.
The analysed blood samples are as follows:
1) 82 samples obtained from the farmers living in the four districts in Kyushu of Japan where the use of OCPs were forbidden about 10 years before the time of blood sampling.
2) 9 samples from the farmers living in Risen district near Seoul of Korea where OCPs were being used at the time of blood sampling.
3) 20 samples from the farmers living in Katmandu of Nepal where OCPs were being used at the time of blood sampling.
The obtained results were as follows:
1) Percentage of the samples showing the β-BHC level higher than 10 ppb was 48% for the Japanese, 0% for the Korean, and 0% for the Nepalese.
2) That of the samples showing the total DDT level higher than 15 ppb was 26%, 0% and 100% for the respective country in the above order.
3) That of the samples shnwing the PCB level higher than 5 ppb was 60%, 12% and 0% for the respective country.
Based on the results, relations between the OCPs or PCB level and the history of the use of OCPs or the eating habits in each country were discussed.

In order to find some countermeasures to relieve the workload upon the lower back due to harvesting and sorting strawberries, prevalence of localized fatigue complaints and flexibility of spine of strawberry farmers were compared with eggplant farmers. Furthermore time study, global EMG and biomechanical analysis of body postures during harvesting strawberries and so forth were performed. Obtained results are as follows:
1) As for the localized fatigue complaints during the one month soon after harvesting season, prevalence of the lower back pain was 58.1% in men and 82.5% in women. As to the body part where fatigue feeling appears during harvesting strawberries, most of the farmers pointed out the lower back.
2) Flexibility of the spine was disturbed in some degree compared with the eggplant farmers.
3) The specific stooping posture with the left forearm supported by the left thigh just above the knee was sometimes observed and was suspected to relieve the load upon the lower back. This posture was proved to decrease the moment upon the lower back, to straighten the unnatural curvature of thoracolumbar spine, and relieve the muscle tension of legs.
4) Too short leisure season in the strawberry cultivation and too short sleeping hours due to long working hours during harvesting season were considered to accelarate the accumulative localized fatigue in the lower back.

Environmental contamination caused by the organochlorine pesticides (OCPs), such as BHC and DDT, as well as polychlorinated biphenyls (PCBs), is an important problem because of their accumulation in human bodies due to their high lipophilic properties and high chemical stability. In this study, we have investigated the actual condition of the BHC, DDT and PCB levels in the plasma of farmers in the three districts of Japan and in China. At the time of the blood sampling, about 10years had passed since the use of OCPs was forbidden in Japan, whereas OCPs were being used in China.
The blood samples were collected from following 4 districts:(a) Northern Kyushu (N =67), (b) Tomishiro in Okinawa prefecture (N=24), (c) Yokote in Akita prefecture (N = 36) and (d) Harbin in China (N =21).
The results are as follows:
1) β-BHC was detected in all of the 148 plasma samples with the range of 0.9-48.4 ppb. Percentage of the samples with the β-BHC level higher than 20 ppb was 2%(3 samples) for the Japanese and 57%(12 samples) for the Chinese.
2) p, p'-DDT and p, p'-DDE were detected in all samples and total-DDT was ranged from 2.4 to 49.9 ppb. Percentage of the samples with the total-DDT level higher than 20 ppb was 43%(9 samples) for the Chinese and 8%(10 samples) for the Japanese. DDT level of Chinese was significantly higher than those of farmers in Northern Kyushu and Yokote.
3) PCBs were detected in all of the Japanese samples (n=127) with the range of 1.1-22.8 ppb. Whereas the PCB level of 15 samples of Chinese women was less than 1.0 ppb and that of other 4 samples of Chinese men was higher than 10 ppb.
From these results, regional difference in the residue of OCPs and PCBs in Japanese was discussed, besides the difference in that of OCPs beteween Japanese and Chinese was discussed in relation to the history of the use of OCPs.