OBJECTIVEExposure to polychlorinated biphenyls (PCBs) is considered to have culminated between 1950 and 1970 in Japan, and exposure through diet, the major exposure route, has decreased significantly over the last 10 years. The primary goal of the present study was to investigate the long-term trends and congener profiles of serum and dietary levels of PCBs using historical samples.

METHODSUsing banked samples collected in 1980, 1995, and 2003 surveys, we determined the daily intakes and serum concentrations of 13 PCB congeners (#74, #99, #118, #138, #146, #153, #156, #163, #164, #170, #180, #182, and #187) in women.

RESULTSThe total daily PCB intake [ng/day, geometric mean (geometric standard deviation)] decreased significantly from 523 (2.5) in 1980 to 63 (3.2) in 2003. The serum total PCB level (ng/g lipid) in women <40 years of age decreased significantly from 185 (1.8) in 1980 to 68 (1.8) in 2003. In contrast, the level in women >50 years of age increased significantly from 125 (1.7) in 1980 to 242 (1.7) in 2003. Specifically, the serum concentrations of hexa (#138, #146, #153, #156, #163, and #164) and hepta (#170, #180, #182, and #187) congeners increased significantly. A comparison of the serum PCB levels of women born from 1940 to 1953 revealed that their serum total PCB level was significantly higher in the 2003 survey [242 (1.7), n = 9] than in the 1995 [128 (2.0), n = 17] surveys. This increase in the total PCB level was attributable to increases in the hepta congener groups.

CONCLUSIONPresent results suggest a decreased rate of elimination of hepta congeners with aging in females, rather than a birth-generation phenomenon.

OBJECTIVESThe prevalence of thoracic kyphosis is considered to increase as the population is ageing in Japan. However, little is known about the clinical and preventive significance of kyphosis. The purpose of the study is to assess the association of kyphosis with subjective poor health and functional activity in the community-dwelling Japanese elderly. The relation of kyphosis with blood pressure, as a subclinical indicator of arteriosclerosis, is also examined.

METHODSThe subjects consisted of 536 (male 241, female 295) elderly persons aged 65 years old and older. Trained examiners measured thoracic kyphosis using a flexicurve, and kyphosis index was calculated. Information on the subjects' subjective poor health and functional activity were collected through a face-to-face interview, and blood pressure was measured by a conventional method.

RESULTSIn females, their kyphosis index increased with age increased, whereas in males, there was no clear age-related change. An increased kyphosis index was associated with subjective poor health only among females. Compared with the lowest kyphosis index tertile, adjusted odds ratios for being in poor health were 5.4 (95% confidence interval: 1.1-27.4) in the middle tertile, and 6.4 (95% confidence interval: 1.3-32.1) in the highest tertile. Kyphosis index did not seem to be associated with functional activity score and blood pressure both in males and females even after adjustment.

CONCLUSIONSKyphosis is associated with subjective poor health in the community-dwelling female elderly in this study population, but not with functional activity and blood pressure both in males and females.