Details of a Researcher - Okamura, Tomonori

Papers - Okamura, Tomonori

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The proportion of individuals with obesity-induced hypertension among total hypertensives in a general Japanese population

Nakamura Koshi, Okamura Tomonori, Hayakawa Takehito, Hozawa Atsushi, Kadowaki Takashi, Murakami Yoshitaka, Kita Yoshikuni, Okayama Akira, Ueshima Hirotsugu

European Journal of Epidemiology 22 ( 10 ) 691 - 698 2007.10

ISSN 0393-2990

The increased prevalence of obesity in Japan may contribute to the high prevalence of hypertension in Japan. In the present study, we calculated the odds ratio for hypertension in obesity (body mass index (BMI) ≥ 25.0 kg/m²) using data from independent nationwide surveys conducted in 1980 and 1990. We estimated the percentage of hypertensives whose condition was due to obesity among total hypertensives in the general Japanese population. In the 1980 survey, 18.8% of 4,623 male participants were obese and 50.4% were hypertensive, whereas 22.6% of 5,893 female participants were obese and 41.1% were hypertensive. For both sexes, obese participants had a higher odds ratio for hypertension than non-obese participants (BMI < 25.0 kg/m²), and there was a significant dose-response relationship between BMI and the odds ratio for hypertension. Among all hypertensives, the percentage whose hypertension was due to obesity in 1980 and 1990 was 11.4% (95% confidence interval (CI): 4.7-17.7%) and 15.3% (95% CI: 6.8-23.1%) for men and 19.3% (95% CI: 12.1-25.9%) and 22.3% (95% CI: 14.6-29.3%) for women, respectively. Approximately 80-90% of individuals with obesity-induced hypertension were in the 25.0 ≤ BMI < 30.0 kg/m² category for both sexes in each year. In conclusion, we found that obesity-induced hypertension as a proportion of total hypertension increased between 1980 and 1990 for both sexes. Obesity now is playing a more important role in the high prevalence of hypertension in Japan than it was before. © 2007 Springer Science+Business Media B.V.

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Medical costs of obese Japanese

Nakamura Koshi, Okamura Tomonori, Kanda Hideyuki, Hayakawa Takehito, Okayama Akira, Ueshima Hirotsugu, Yamashita Shigeo, Tominaga Yoshinori, Katsuyama Kazuaki, Kakuno Fumihiko, Kitanishi Machiko, Tobita Yukio, Okamura Kanehiro, Hatta Kiminobu, Okada Takao, Hatanaka Michiko

European Journal of Public Health 17 ( 5 ) 424 - 429 2007.10

ISSN 1101-1262

Background: For the Japanese population, a body mass index (BMI) of 25.0-29.9 is classified as obesity and is a risk factor for cardiovascular disorders such as hypertension. Methods: A cohort study to clarify obesity costs for a Japanese population was conducted utilizing baseline BMI and medical costs over a 10-year follow-up period. The participants were 4502 community dwelling Japanese National Health Insurance (NHI) beneficiaries aged 40-69 years. According to their baseline BMI values (kg/m²), participants were classified into the following three categories: BMI < 18.5, 18.5 ≤ BMI < 25.0 and 25.0 ≤ BMI. Medical costs per person per month were compared among the three categories. Excess medical costs attributable to the 25.0 ≤ BMI category compared to the 18.5 ≤ BMI < 25.0 category were estimated. Results: Approximately 20% of the Japanese population studied had a BMI of 25.0 or over. A J-shaped relationship between BMI and personal total medical costs was observed. Personal total medical costs per month determined from the 10-year follow-up in each category were 189 Euros (BMI < 18.5), 134 Euros (18.5 ≤ BMI < 25.0) and 155 Euros (25.0 ≤ BMI). A J-shaped pattern was observed after adjusting for age, sex, smoking and drinking habits, and excluding early deceased participants. Furthermore, smoking habit did not modify the J-shaped pattern of total medical costs. The estimated excess medical costs for the 25.0 ≤ BMI category represented 3.1% of the total medical costs for the entire study population (634 105 Euros). Conclusion: The Japanese NHI beneficiaries with a BMI of 25.0 or over showed increased medical costs compared to those with a BMI of 18.5-24.9. © The Author 2007. Published by Oxford University Press on behalf of the European Public Health Association. All rights reserved.

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Awareness and treatment of hypertension and hypercholesterolemia in Japanese workers

Tanaka Taichiro, Okamura Tomonori, Yamagata Zentaro, Takebayashi Toru, Tamura Unai, Kusaka Yukinori, Urano Sumio, Miyoshi Yuji, Okayama Akira, Ueshima Hirotsugu, Sakata Kiyomi, Tsuji Keiko, Yoshita Katsushi, Kikuchi Yuriko, Nakagawa Hideaki, Miura Katsuyuki, Yamato Hiroshi, Chiba Nagako, Yanagita Masahiko, Kodama Kazunori, Kasagi Fumiyoshi, Nishi Nobuo, Saitoh Shigeyuki, Tanaka Hideo, Nakamura Masakazu, Naito Yoshihiko, Nakamura Yasuyuki, Watanabe Makoto, Nakamura Yoshikazu, Babazono Akira, Yamagata Zentaro, Urano Sumio, Kinoshita Fujihisa, Saitoh Isao, Tanihara Shinichi, Tamaki Junko, Tochikubo Osamu, Nakayama Takeo, Fukuhara Shunichi, Fujieda Yoshiharu, Naito Mariko, Mizushima Shunsaku, Miyoshi Yuji, Tada Takayo, Kadowaki Takashi, Yoshida Toshimi, Ide Mami

Hypertension Research 30 ( 10 ) 921 - 928 2007.10

ISSN 0916-9636

The objective of this study was to clarify the awareness and treatment status of hypertension in Japanese workers, comparing with those of hypercholesterolemia. The subjects were 6,186 workers (age 19 to 69 years), who worked at 12 workplaces in Japan and who continuously participated in the High-risk and Population Strategy for Occupational Health Promotion (HIPOP-OHP) study at the baseline (1999 or 2000) and the subsequent year (2000 or 2001). No Intervention was performed during the study period. Blood pressure and total cholesterol level were measured at baseline. Awareness and treatment status were examined by a self-administered questionnaire in the following year. Untreated subjects were defined as those were not aware of hypertension (or hypercholesterolemia) or those not taking medication and not undergoing lifestyle modification. The percentages of subjects with hypertension defined as aware were 65.7% in men and 72.7% in women, respectively. The percentages of subjects with hypercholesterolemia defined as aware were 55.7% in men and 58.6% in women, respectively. In subjects 40 years and older, the awareness rate for hypertension was significantly higher than the awareness rate for hypercholesterolemia (75.0% vs. 59.2%, p<0.001). The percentage of untreated subjects with hypertension was significantly lower than the percentage of untreated subjects with hypercholesterolemia (41.0% vs. 57.1%, p<0.001). Although Japanese workers ≥40 years old have a higher awareness of and are more often treated for hypertension than for hypercholesterolernia, there are still many unaware and untreated individuals with either disease in all age groups. It is important to increase the awareness of risk factors in individuals with positive findings for these conditions.

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γ-Glutamyltransferase predicts cardiovascular death among Japanese women

Hozawa Atsushi, Okamura Tomonori, Kadowaki Takashi, Murakami Yoshitaka, Nakamura Koshi, Hayakawa Takehito, Kita Yoshikuni, Nakamura Yasuyuki, Okayama Akira, Ueshima Hirotsugu

Atherosclerosis 194 ( 2 ) 498 - 504 2007.10

ISSN 0021-9150

The clinical importance of γ-glutamyltransferase (GGT) has recently been debated. Although some studies have suggested that the relationship between GGT and cardiovascular disease (CVD) mortality is independent of alcohol consumption, to our knowledge no studies have reported the relationship between GGT and CVD mortality in never-drinker subgroups. Since Japanese women are known to have a lower prevalence of alcohol consumption, we examined whether GGT predicts CVD mortality in never-drinkers. We followed 2724 Japanese men and 4122 Japanese women without prior CVD or liver dysfunction for 9.6 years and observed 83 and 82 CVD deaths, respectively. Current alcohol drinkers comprised 59% of men and 7% of women. Among women, the multiple adjusted hazard ratio (HR) for CVD mortality compared with the reference group (GGT: 1-12 U/L) was 2.88 (95% confidence interval (CI), 1.14-7.28) for the elevated group (GGT ≥ 50 U/L). This positive relationship was unchanged in the never-drinkers subgroup (HR for log-transformed continuous GGT, 1.62 (95% CI, 1.11-2.37)). No significant relationships were observed in men. GGT displays a strong positive association with CVD mortality among Japanese women, for whom the prevalence of ever-drinkers is very low. Exploring the significance and biological mechanisms of GGT might provide useful insights into CVD prevention. © 2006 Elsevier Ireland Ltd. All rights reserved.

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Response to letter by Walsh et al [14]

Hozawa Atsushi, Okamura Tomonori, Ueshima Hirotsugu

Stroke 38 ( 9 ) 2007.09

ISSN 0039-2499

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Normal fasting plasma glucose levels and type 2 diabetes

Hayashino Y., Fukuhara S., Suzukamo Y., Okamura T., Tanaka T., Ueshima H.

Acta Diabetologica 44 ( 3 ) 164 - 166 2007.09

ISSN 0940-5429

The objective of this study is to ascertain if higher normal fasting glucose levels are also an independent risk of developing diabetes in an Asian population, and we thus analysed data from a cohort of healthy Japanese workers. We used data from the non-randomised trial on health promotion intervention, High-risk and Population Strategy for Occupational Health Promotion (HIPOP-OHP) Study. Diabetes cases and those who had fasting blood glucose levels equal to or greater than 100 mg/dl at baseline were excluded, and the Cox proportional-hazards model was used for the analysis. During the four-year follow-up of 2212 participants, we found 37 diabetes cases. In the multivariable model, people with blood glucose levels in the 4th quartile had a higher risk of diabetes than those in the bottom quartile; the multivariable-adjusted odds ratio was 2.52. The risk of diabetes abruptly rose in persons with blood glucose levels higher than 94 mg/dl (fourth quartile). A significant linear trend was not observed in the 1st to 3rd quartiles (p=0.726). In conclusion, higher fasting glucose level was associated with the risk of diabetes, and we found a threshold in the association between fasting blood glucose levels and risk of diabetes in an Asian population. © 2007 Springer-Verlag.

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Fish consumption and early atherosclerosis in middle-aged men

Nakamura Yasuyuki, Ueno Yoshiki, Tamaki Shinji, Kadowaki Takashi, Okamura Tomonori, Kita Yoshikuni, Miyamatsu Naomi, Sekikawa Akira, Takamiya Tomoko, El-Saed Aiman, Sutton-Tyrrell Kim, Ueshima Hirotsugu

Metabolism: Clinical and Experimental 56 ( 8 ) 1060 - 1064 2007.08

ISSN 0026-0495

To investigate the association between fish consumption and early atherosclerosis, we analyzed the relationship between fish consumption and average intima-media thickness (AveIMT) by carotid ultrasound in middle-aged Japanese men. Participants were 250 randomly selected, community-based Japanese men aged 40 to 49 years without a prior history of cardiovascular disease. AveIMT was calculated from the mean of 1-cm lengths of both the right and the left carotid arteries at 8 locations. A lifestyle survey was carried out using a self-administered questionnaire including the frequency of fish intake. There were 147 men in the fewer than 4 times per week fish consumption group and 103men in the 4 or more times per week group. The mean AveIMT was significantly higher in the low fish consumption group than in the high fish consumption group (0.623 ± 0.068 vs 0.605 ± 0.065 mm, P = .03). After adjustment for age, waist circumference, pack-years of smoking, alcohol consumption, diabetes, and lipid-lowering medications, the significant difference in the AveIMT between the 2 groups remained. However, after further adjustment for low-density lipoprotein cholesterol, high-density lipoprotein cholesterol, triglycerides, and C-reactive protein in the model, the significant difference disappeared. Fish consumption may be protective against early atherosclerosis in middle-aged men, probably through its beneficial effects on inflammation. © 2007 Elsevier Inc. All rights reserved.

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The proportion of individuals with alcohol-induced hypertension among total hypertensives in a general japanese population

Nakamura Koshi, Okamura Tomonori, Hayakawa Takehito, Hozawa Atsushi, Kadowaki Takashi, Murakami Yoshitaka, Kita Yoshikuni, Okayama Akira, Ueshima Hirotsugu, Iimura Osamu, Omae Teruo, Ueda Kazuo, Yanagawa Hiroshi, Horibe Hiroshi, Kodama Kazunori, Kasagi Fumiyoshi, Tanihara Shinichi, Saito Shigeyuki, Sakata Kiyomi, Nakamura Yosikazu, Kakuno Fumihiko, Takeuchi Toshihiro, Hasebe Mitsuru, Kusano Fumitsugu, Kawamoto Takahisa, Minowa Masumi, Iida Minoru, Hashimoto Tsutomu, Tanaka Shigemichi, Terao Atsushi, Kawaminami Katsuhiko, Sawai Koryo, Shibata Shigeo

Hypertension Research 30 ( 8 ) 663 - 668 2007.08

ISSN 0916-9636

Japanese men consume more alcoholic beverages than men in many other developed countries. The high consumption rate of alcoholic beverages among Japanese men may contribute to the high prevalence of hypertension in Japan. In the present study, we calculated the odds ratio for hypertension in alcohol drinkers based on recent criteria using data from a nationwide survey conducted in Japan in 1990, and estimated, among total hypertensives in a general Japanese population, the percentage of hypertensives whose condition was due to alcohol consumption. Of 3,454 male participants, 64.8% were drinkers (1 gou/day, 28.9%; 2 gou/day, 20.1%; 3 gou/day or more, 8.7%; ex-drinkers, 7.0%) and 49.8% were hypertensive, whereas 7.6% of 4,808 female participants were drinkers (1 gou/day, 5.2%; 2 gou/day or more, 1.3%; ex-drinkers, 1.1%) and 43.1% were hypertensive (1 gou=23.0 g of alcohol). In both sexes, drinkers had a higher odds ratio for hypertension than never drinkers, and there was a significant dose-response relationship between the amount of alcohol consumed and the odds ratio for hypertension. Among all hypertensives, the percentage whose hypertension was due to alcohol consumption was 34.5% (95% confidence interval, 10.9%,51.9%) for men and 2.6% (0.8%,5.8%) for women. The corresponding proportion based on daily alcohol intake was 12.7% for 1 gou/day, 11.1 % for 2 gou/day, 5.8% for 3 gou/day or more, and 4.8% for ex-drinkers in men, and 1.8% for 1 gou/ day, 0.7% for 2 gou/day or more, and -0.1% for ex-drinkers in women. In conclusion, we found that a large percentage of the hypertensives in a general Japanese male population had alcohol-induced hypertension.

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Reduced HDL-cholesterol levels associated with smoking

Okamura Tomonori, Higashiyama Aya, Miyamatsu Naomi

Nippon rinsho. Japanese journal of clinical medicine 65 Suppl 7 663 - 666 2007.07

ISSN 0047-1852

Serum ghrelin levels are higher in Caucasian men than Japanese men aged 40-49 years

Matsunaga-Irie S., Ueshima H., Zaky W. R., Kadowaki T., Evans R. W., Okamura T., Takamiya T., Kita Y., Kuller L. H., Sekikawa Akira

Diabetes, Obesity and Metabolism 9 ( 4 ) 591 - 593 2007.07

ISSN 1462-8902

Background: Ghrelin, a 28-amino-acid gastric peptide hormone, has an appetite-stimulating effect and controls the energy balance. Serum ghrelin levels inversely correlate with body mass index. Recently, several papers reported the ethnic difference in the ghrelin levels. To our knowledge, however, no studies have compared the serum ghrelin levels between Caucasians in the USA and the Japanese in Japan. Methods: We conducted a cross-sectional study of 189 men 40-49 years of age (91 US Caucasians in the U.S. and 98 Japanese in Japan) to examine serum ghrelin levels and metabolic and other factors. Results: Serum ghrelin levels correlated with waist circumferences and lipid profiles among Caucasian Americans and the Japanese. Serum ghrelin levels were significantly higher among Caucasian Americans than among the Japanese (904.5 (632.0, 1132.0) pg/mL, 508.0 (399.0, 1378.3) pg/mL (median and 95% confidence interval), respectively, P < 0.01), although Caucasian Americans were much more obese (BMI: 26.9 ± 3.3 kg/m² versus 23.3 ± 3.1 kg/m² respectively, P < 0.01). The ethnic difference remained after adjusting for metabolic factors, smoking status, and other factors (P < 0.01). Conclusions: We have shown in our population-based study that serum ghrelin levels among men aged 40-49 are significantly higher in Caucasian Americans than in the Japanese in Japan. Reasons for the ethnic difference in the ghrelin levels are largely unknown and warrant further investigation. © 2006 Blackwell Publishing Ltd.

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Lifestyle and work predictors of fatigue in Japanese manufacturing workers

Yamazaki Shin, Fukuhara Shunichi, Suzukamo Yoshimi, Morita Satoshi, Okamura Tomonori, Tanaka Taichiro, Ueshima Hirotsugu

Occupational Medicine 57 ( 4 ) 262 - 269 2007.06

ISSN 0962-7480

Background: Fatigue is one of the most common symptoms encountered in medical practice. However, little is known about the causal relationship between change in lifestyle and fatigue. Aim: To help prevent fatigue-related disorders, we investigated the association between changes in lifestyle and fatigue among employees. Methods: We studied data sets from the High-risk and Population Strategy for Occupational Health Promotion study for employees at 10 workplaces in Japan. The baseline survey was done in 1999 and the follow-up survey in 2003 via a questionnaire which examined lifestyle and fatigue variables using the vitality domain scale of the SF-36 Health Survey. The lifestyle factors focused on were diet, smoking and alcohol habits and working conditions. Four-year changes in lifestyle that predicted the vitality domain score in the follow-up survey were examined by analysis of covariance. Results: Of the 6284 participants in the baseline survey, 4507 replied to the follow-up survey, of whom 3498, with a mean age of 37 (SD 18) years, returned valid responses. A low vitality score at follow-up was predicted by a change in lifestyle factors such as an increase in overtime work, change to non-sedentary work and increased frequency of eating between meals (P < 0.01, P < 0.01 and P = 0.02, respectively). Conclusion: Fatigue in salaried workers as measured by the vitality domain of the SF-36 is predicted by an increase in overtime work, change to non-sedentary work and an increase in the frequency of eating between meals. © The Author 2007. Published by Oxford University Press on behalf of the Society of Occupational Medicine. All rights reserved.

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Does self-reported history of hypertension predict cardiovascular death? Comparison with blood pressure measurement in a 19-year prospective study

Higashiyama Aya, Murakami Yoshitaka, Hozawa Atsushi, Okamura Tomonori, Hayakawa Takehito, Kadowaki Takashi, Kita Yoshikuni, Okayama Akira, Ueshima Hirotsugu

Journal of Hypertension 25 ( 5 ) 959 - 964 2007.05

ISSN 0263-6352

OBJECTIVES: Hypertension as assessed by blood pressure (BP) measurement is one of the most important risk factors for cardiovascular diseases (CVD). Self-reported history of hypertension (self-reported HT) is an easy way to obtain information on BP and is known to have a certain sensitivity and high specificity for hypertension confirmed by BP measurement (confirmative HT). Thus, it might predict CVD mortality, but few studies have reported on this relationship. METHODS: We followed 6427 participants aged 30-59 years without a history of CVD for 19 years. The multivariate-adjusted hazard ratio (HR) of CVD mortality was estimated by the Cox proportional hazard model. RESULTS: The sensitivity and specificity of self-reported HT for confirmative HT were 52-65% and 95%, respectively. The multivariate-adjusted HR of self-reported HT for CVD death was 2.49 [95% confidence interval (CI) = 1.72-3.61]. Compared to participants with neither self-reported HT nor confirmative HT, those with confirmative HT showed a consistently higher HR for CVD mortality. Self-reported HT without confirmative HT was also significantly related to CVD mortality (HR = 2.10, 95% CI = 1.04-4.26). These tendencies were unchanged when we further adjusted for systolic BP (SBP) level. The age-adjusted mortality rate of individuals with self-reported HT corresponded to the age-adjusted mortality rate of individuals whose SBP was 160-179 mmHg. CONCLUSION: Self-reported HT could screen one-half of the participants for confirmative HT and was significantly associated with CVD mortality. These results indicate that self-reported HT can be a useful tool to screen for individuals with high BP if it is difficult to perform BP measurements continuously among all members of a community. © 2007 Lippincott Williams & Wilkins, Inc.

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Relationship between metabolic risk factor clustering and cardiovascular mortality stratified by high blood glucose and obesity

Kadota Aya, Hozawa Atsushi, Okamura Tomonori, Kadowak Takashi, Nakmaura Koshi, Murakami Yoshitaka, Hayakawa Takehito, Kita Yoshikuni, Okayama Akira, Nakamura Yasuyuki, Kashiwagi Atsunori, Ueshima Hirotsugu

Diabetes Care 30 ( 6 ) 1533 - 1538 2007.05

ISSN 0149-5992

OBJECTIVE - Metabolic syndrome is diagnosed according to several criteria. Of these, some require glucose intolerance and others require obesity for the diagnosis. We investigated the relationship between metabolic risk factor clustering and cardiovascular disease (CVD) mortality stratified by high blood glucose or obesity. RESEARCH DESIGN AND METHODS - We followed 7,219 Japanese men and women without a history of CVD for 9.6 years. We defined high blood pressure, high blood glucose, high triglycerides, low HDL cholesterol, and obesity as metabolic factors. The multivariate adjusted hazard ratio (HR) for CVD mortality according to the number of clustering metabolic factors was calculated using the Cox proportional hazards model. RESULTS - During follow-up, 173 participants died of CVD. The numbers of metabolic risk factors and CVD mortality were positively correlated (P_trend = 0.07). The HR was obviously higher among participants with than among those without high blood glucose and clustering of ≥2 other metabolic risk factors (HR 3.67 [95% CI 1.49-9.03]). However, the risk increase was only modest in participants without high blood glucose even if they had ≥2 other metabolic risk factors (1.99 [0.93-4.28]). Conversely, metabolic risk factor clustering was related to CVD mortality irrespective of obesity. CONCLUSIONS - Our findings suggest that glucose tolerance plays an important role in CVD mortality. Because the prevalence of nonobese participants with several metabolic risk factors was quite high and their CVD risk was high, excluding them from the diagnosis of metabolic syndrome because of the absence of obesity might overlook their risk. © 2007 by the American Diabetes Association.

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Life expectancy among Japanese of different smoking status in Japan

Murakami Yoshitaka, Ueshima Hirotsugu, Okamura Tomonori, Kadowaki Takashi, Hozawa Atsushi, Kita Yoshikuni, Hayakawa Takehito, Okayama Akira

Journal of Epidemiology 17 ( 2 ) 31 - 37 2007.04

ISSN 0917-5040

Background: The life expectancy is an important measure for describing health status among population. Several studies from the United States and Europe showed the harm of smoking by describing the life expectancies with different smoking status. No such study is examined in Japan, the country with the world's highest life expectancy irrespective of high smoking rate among men. Methods: The abridged life table method was applied to calculate the life expectancies of men and women among different smoking status from age 40 until age 85. Age-specific mortality rates stratified by different smoking status were obtained from follow-up data from random sample in Japanese population (NIPPON DATA80). Results: Proportion of current smokers was 62.9% in men and 8.8% in women at the baseline survey in 1980. The life expectancies of 40-year-old never smokers, ex-smokers and current smokers were 42.1, 40.4, and 38.6 years in men and 45.6, 45.9, and 43.4 years in women. The life expectancy of 40-year-old men who smoked less than one pack per day was 39.0 and was longer than that of those who smoked one or two packs (38.8) and more than two packs (38.1). Conclusion: Life expectancy decreased gradually as the grade of smoking increased in the Japanese population. Copyright © 2007 by Japan Epidemiological Association.

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Both angiotensinogen M235T and α-adducin G460W polymorphisms are associated with hypertension in the Japanese population

Nakamura Y., Tabara Y., Miki T., Tamaki S., Kita Y., Okamura T., Ueshima H.

Journal of Human Hypertension 21 ( 3 ) 253 - 255 2007.03

ISSN 0950-9240

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Medical costs of individuals with proteinuria

Nakamura Koshi, Okamura Tomonori, Kanda Hideyuki, Hayakawa Takehito, Okayama Akira, Ueshima Hirotsugu

Public Health 121 ( 3 ) 174 - 176 2007.03

ISSN 0033-3506

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The association between high-density lipoprotein cholesterol level and cholesteryl ester transfer protein TaqIB gene polymorphism is influenced by alcohol drinking in a population-based sample

Tsujita Yasuyuki, Nakamura Yasuyuki, Zhang Qishan, Tamaki Shinji, Nozaki Akihiko, Amamoto Kenji, Kadowaki Takashi, Kita Yoshikuni, Okamura Tomonori, Horie Minoru, Ueshima Hirotsugu

Atherosclerosis 191 ( 1 ) 199 - 205 2007.03

ISSN 0021-9150

Cholesteryl ester transfer protein (CETP) is a key enzyme in high-density lipoprotein (HDL) cholesterol metabolism. We studied the association between CETP TaqIB polymorphism and the HDL cholesterol levels considering environmental factors in a population-based sample consisting of 1729 participants who did not use lipid-lowering agents (659 men and 1070 women). The CETP TaqIB genotypes were determined by PCR-RFLP analysis. The serum HDL cholesterol levels of female participants with the B2B2 genotype were significantly higher than those with other genotypes (p < 0.001). Multiple regression analysis with covariates such as age, waist to hip (W/H) ratio, alcohol drinking, current smoking, non-HDL cholesterol, and logarithm of triglyceride revealed that the CETP TaqIB genotype was an independent determinant of HDL cholesterol levels in men (p = 0.049) and women (p < 0.001). Subgroup analysis revealed that an interaction was observed between the CETP TaqIB polymorphism and alcohol consumption in the regulation of HDL cholesterol levels in men (p = 0.049) and women (p = 0.022). No interactions were observed between the CETP TaqIB polymorphism and current smoking status, body mass index, or W/H ratio in the regulation of HDL cholesterol levels. The association between the CETP TaqIB polymorphism and HDL cholesterol levels was more evident in alcohol consumers than in non-drinkers. © 2006 Elsevier Ireland Ltd. All rights reserved.

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Less subclinical atherosclerosis in Japanese men in Japan than in white men in the United States in the post-world war II birth cohort

Sekikawa Akira, Ueshima Hirotsugu, Kadowaki Takashi, El-Saed Aiman, Okamura Tomonori, Takamiya Tomoko, Kashiwagi Atsunori, Edmundowicz Daniel, Murata Kiyoshi, Sutton-Tyrrell Kim, Maegawa Hiroshi, Evans Rhobert W., Kita Yoshikuni, Kuller Lewis H.

American Journal of Epidemiology 165 ( 6 ) 617 - 624 2007.03

ISSN 0002-9262

Coronary heart disease incidence and mortality remain very low in Japan despite major dietary changes and increases in risk factors that should have resulted in a substantial increase in coronary heart disease rates (Japanese paradox). Primary genetic effects are unlikely, given the substantial increase in coronary heart disease in Japanese migrating to the United States. For men aged 40-49 years, levels of total cholesterol and blood pressure have been similar in Japan and the United States throughout their lifetimes. The authors tested the hypothesis that levels of subclinical atherosclerosis, coronary artery calcification, and intima-media thickness of the carotid artery in men aged 40-49 years are similar in Japan and the United States. They conducted a population-based study of 493 randomly selected men: 250 in Kusatsu City, Shiga, Japan, and 243 White men in Allegheny County, Pennsylvania, in 2002-2005. Compared with the Whites, the Japanese had a less favorable profile regarding many risk factors. The prevalence ratio for the presence of a coronary calcium score of ≥10 for the Japanese compared with the Whites was 0.52 (95% confidence interval: 0.35, 0.76). Mean intima-media thickness was significantly lower in the Japanese (0.616 mm (standard error, 0.005) vs. 0.672 (standard error, 0.005) mm, p < 0.01). Both associations remained significant after adjusting for risk factors. The findings warrant further investigations. Copyright © 2007 by the Johns Hopkins Bloomberg School of Public Health All rights reserved.

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Hypertension and medical expenses

Nakamura Koshi, Okamura Tomonori, Ueshima Hirotsugu

Nihon Naika Gakkai zasshi. The Journal of the Japanese Society of Internal Medicine 96 ( 1 ) 101 - 105 2007.01

ISSN 0021-5384

Relation of adult height with stroke mortality in Japan NIPPON DATA80

Hozawa Atsushi, Murakami Yoshitaka, Okamura Tomonori, Kadowaki Takashi, Nakamura Koshi, Hayakawa Takehito, Kita Yoshikuni, Nakamura Yasuyuki, Okayama Akira, Ueshima Hirotsugu, Okamura T., Kadowaki T., Hayakawa T., Kita Y., Okayama A., Ueshima H.

Stroke 38 ( 1 ) 22 - 26 2007.01

ISSN 0039-2499

BACKGROUND AND PURPOSE - The age-adjusted stroke mortality rate in Japan was the highest in the world from 1950 to the 1970s, but it started to dramatically decrease after 1965. In addition to improved management of high blood pressure, the increase in average height might also contribute to this reduction. The present study investigates whether height is an independent risk for stroke mortality in Japan. METHODS - Among participants of the National Survey on Cardiovascular Diseases in 1980 who were randomly selected from the Japanese population, we followed up 3969 and 4955 Japanese men and women without prior cardiovascular disease for a maximum of 19 years and observed 158 and 132 stroke deaths. RESULTS - Height was inversely correlated with age and with crude stroke mortality. The relationship was attenuated in men when we adjusted for age or other possible confounders (multivariate adjusted relative hazards of a 5-cm increase of height for stroke mortality: 0.92, 95% CI: 0.79 to 1.08). For women, the inverse relationship (relative hazard: 0.77: 95% CI: 0.64 to 0.91) remained after multivariate adjustment. These relationships persisted when we stratified participants by age. CONCLUSIONS - Height is inversely related to stroke mortality and the relationship is statistically significant among Japanese women. © 2007 American Heart Association, Inc.

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