Publications by authors named "NAKAYA K"

Background: Natural disasters may have negative health effects on survivors. However, long-term observations on this are lacking. Therefore, this study investigated the association between the degree of housing damage caused by the Great East Japan Earthquake (GEJE) and all-cause mortality using the data from the cohort study conducted by the Tohoku Medical Megabank (TMM) Project in disaster-stricken areas.

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Background: The primary prevention of atrial fibrillation (AF), which increases mortality through complications including stroke and heart failure, is important. Excessive salt intake and low potassium intake are risk factors for cardiovascular disease; however, their association with AF remains inconclusive. This study investigated the association between sodium- and potassium-related urinary markers and AF prevalence.

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Aim: The aim of this study was to evaluate depression at 6 and 12 months postpartum, using the Edinburgh Postpartum Depression Scale (EPDS) total score and its subitem regarding self-harm ideation (SHI) at 1 month postpartum.

Methods: A sample of 12,358 postpartum women answered the EPDS and questionaries at 1, 6, and 12 months postpartum longitudinally.

Results: For participants with postpartum depression (PPD; EPDS total score ≥9) and SHI (SHI sub-score ≥1) at 1 month postpartum, the risk of depression at 6 and 12 months postpartum (odds ratio [95% confidence interval] at 6 and 12 months postpartum: 20.

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Objectives: To examine the effect of social support on the risk of caregiver's functional disability due to spouse's functional disability.

Design: Longitudinal study.

Setting And Participants: In this cohort study using the Ohsaki Cohort 2006 Study data, the baseline survey was conducted from December 1, 2006, to December 15, 2006, and included 7598 older adults, including 3799 couples, ≥65 years of age.

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Background: Chronic kidney disease (CKD) contributes to decreased life expectancy. We examined the association between leisure-time physical activity (LTPA), non-leisure-time physical activity (non-LTPA) and kidney function.

Methods: This was a cross-sectional study including 32 162 community-dwelling adults aged ≥ 20 years from the Tohoku Medical MegaBank community-based cohort study.

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Article Synopsis
  • - The study aimed to explore how genetic risk, healthy lifestyle habits, and susceptibility to hyperuricaemia (high uric acid levels) are interconnected in a group of over 7,200 participants aged 20 and above.
  • - Results showed that 3% of participants developed hyperuricaemia over 3.5 years, with those having both high genetic risk and poor lifestyle choices significantly more likely to develop the condition (odds ratio: 5.34).
  • - The findings suggest that maintaining a healthy lifestyle can lower the risk of hyperuricaemia despite genetic predispositions, indicating that both genetic and lifestyle factors are important for identifying individuals at risk.
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Few population-based studies including younger adults have examined the potential of olfactory function tests to capture the degree of atrophy in memory-associated brain regions, which cannot be adequately explained by cognitive function tests screening for cognitive impairment. This population-based study investigated associations between high-resolution olfactory test data with few odours and grey matter volumes (GMVs) of the left and right hippocampi, amygdala, parahippocampi, and olfactory cortex, while accounting for differences in cognitive decline, in 1444 participants (aged 31-91 years). Regression analyses included intracranial volume (ICV)-normalised GMVs of eight memory-related regions as objective variables and age, sex, education duration, smoking history, olfaction test score, and the Montreal Cognitive Assessment-Japanese version (MoCA-J) score as explanatory variables.

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This study aimed to investigate the association of combination of birth weight and current body mass index (BMI) with the risk of hypertension in adulthood. This cross-sectional study used data from the Tohoku Medical Megabank Community-based Cohort Study conducted in Japan. A total of 10,688 subjects aged ≥20 years were eligible.

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Regulated neural-metabolic-inflammatory responses are essential for maintaining physiological homeostasis. However, the molecular machinery that coordinates neural, metabolic, and inflammatory responses is largely unknown. Here, we show that semaphorin 6D (SEMA6D) coordinates anxiogenic, metabolic, and inflammatory outputs from the amygdala by maintaining synaptic homeostasis.

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Depression is comorbid with somatic diseases; however, the relationship between depressive symptoms and hypertension (HT), a risk factor for cardiovascular events, remains unclear. Home blood pressure (BP) is more reproducible and accurately predictive of cardiovascular diseases than office BP. Therefore, we focused on home BP and investigated whether depressive symptoms contributed to the future onset of home HT.

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Background: Dementia is the leading cause of disability and imposes a significant burden on society. Previous studies have suggested an association between metabolites and cognitive decline. Although the metabolite composition differs between Western and Asian populations, studies targeting Asian populations remain scarce.

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No study, to our knowledge, has constructed a polygenic risk score based on clinical blood pressure and investigated the association of genetic and lifestyle risks with home hypertension. We examined the associations of combined genetic and lifestyle risks with hypertension and home hypertension. In a cross-sectional study of 7027 Japanese individuals aged ≥20 years, we developed a lifestyle score based on body mass index, alcohol consumption, physical activity, and sodium-to-potassium ratio, categorized into ideal, intermediate, and poor lifestyles.

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Article Synopsis
  • The study assessed how genetic risk factors and lifestyle choices influence the likelihood of developing diabetes in a group of over 11,000 individuals aged 20 and older.
  • Results showed that both genetic risk and lifestyle played significant roles in diabetes development, with an increased risk for those with low genetic risk but poor lifestyle habits.
  • The findings emphasize the importance of maintaining a healthy lifestyle for diabetes prevention, regardless of genetic predisposition, and suggest that genetic data can enhance risk stratification beyond lifestyle and family history.
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Because nuclear medicine diagnostic equipment has not been installed at our educational institution, we had not been able to incorporate nuclear medicine techniques into on-campus training until now. We have introduced a diagnostic image processing simulator to replace nuclear medicine diagnostic equipment. The simulator was used to conduct on-campus practical training on nuclear medicine technology.

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Purpose: To propose a method for calculating hematoma volume based on automatic segmentation of chronic subdural hematoma (CSDH) using 3D U‑net and investigate whether it can be used clinically to predict recurrence.

Methods: Hematoma volumes manually measured from pre- and postoperative computed tomography (CT) images were used as ground truth data to train 3D U‑net in 200 patients (400 CT scans). A total of 215 patients (430 CT scans) were used as test data to output segmentation results from the trained 3D U‑net model.

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Background And Aims: High density lipoprotein (HDL) exerts an anti-atherosclerotic effect via reverse cholesterol transport (RCT). Several phases of RCT are transcriptionally controlled by Liver X receptors (Lxrs). Although macrophage Lxrs reportedly promote RCT, it is still uncertain whether hepatic Lxrs affect RCT in vivo.

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Background: Measurement of fractional exhaled nitric oxide (Feno) has been used in the diagnosis and management of asthma. Understanding the distribution of Feno in a larger resident population and its "healthy" subpopulation would contribute to the interpretation of Feno in clinical practice.

Objective: This study aimed to investigate the distribution and its associated factors in the adult population and its healthy subpopulations.

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Aim: To evaluate the association between housing and psychological damage caused by the Great East Japan Earthquake (GEJE) and modifiable risk factors (MRFs) of dementia for general population of older adults.

Methods: This cross-sectional study enrolled 29 039 community-dwelling older adults (mean age 69.1 ± 2.

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Background: The relationship between blood cell profiles, including hemoglobin (Hb) levels and inflammatory hematological ratios, and mental health problems currently remains unclear.

Aim: This study aimed to investigate the relationship between blood cell profiles and mental health issues, including depressive state and sleep disturbance, while adjusting for potential demographic confounders.

Methodology: This retrospective, cross-sectional, observational study used a population-based medical database from the Tohoku Medical Megabank Project with more than 60,000 volunteers.

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Background/aims: The objective of this research is to examine factors related to irritable bowel syndrome (IBS) prevalence in a large population-based study.

Methods: A cross-sectional study was conducted with participants in the Miyagi part of the Tohoku Medical Megabank Project Community-Based cohort study who completed the Rome II Modular Questionnaire. Multivariate odds ratios (ORs) for the presence of IBS and 95% confidence intervals (95% CIs) for the reference group were calculated for each factor.

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Background: Upper and lower extremity muscle strength can be used to predict health outcomes. However, the difference between the relation of upper extremity muscle and of lower extremity muscle with physiological factors is unclear. This study aimed to evaluate the association between physiological data and muscle strength, measured using grip and leg extension strength, among Japanese adults.

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Article Synopsis
  • The study examined the relationship between various risk factors for hypertension and systolic blood pressure (BP) in a large Japanese population, using a cohort of nearly 63,000 participants.
  • Key findings indicate that higher body mass index, daily salt intake, and gamma-glutamyl transferase levels were associated with increased systolic blood pressure, while current smoking showed an inverse effect.
  • The results suggest the importance of lifestyle changes, such as diet and alcohol consumption adjustments, to help prevent hypertension among individuals.
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Article Synopsis
  • The study aimed to profile participants from Miyagi Prefecture during the second phase of the Tohoku Medical Megabank Community-Based Cohort Study, focusing on their characteristics based on their initial survey participation types.
  • Conducted between June 2017 and March 2021, the survey involved questionnaire data as well as blood, urine, and physiological tests, with three participation types identified in the baseline survey.
  • Results showed a 57.7% participation rate, with an 80% participation rate among those visiting community support centers, revealing similar traits among Type 1 and Type 2 respondents, ultimately aiding in understanding the long-term health impacts of disasters.
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  • This study explored the link between body composition, measured through fat mass index (FMI) and fat-free mass index (FFMI), and lipid levels, specifically low-density lipoprotein cholesterol (LDL-C).
  • The research involved over 18,000 participants without heart disease or diabetes, categorizing them into groups based on their FMI and FFMI to analyze their LDL-C levels.
  • Results showed that higher FMI often correlated with increased LDL-C levels, while higher FFMI tended to lower LDL-C levels, suggesting complex interactions between different body compositions regarding cholesterol levels.
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Article Synopsis
  • * This study from Japan explored the link between depressive symptoms and masked hypertension, analyzing data from 6705 participants who were normotensive in clinical settings but had varying home blood pressure readings.
  • * Findings revealed that individuals with depressive symptoms had higher instances of masked hypertension, with odds ratios indicating a stronger association in males (1.72) compared to females (1.30), suggesting that mental health may influence blood pressure management.
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