Biomedical subjects

Yasuharu Tabara

Publications and source records attributed to Yasuharu Tabara.

3 recordsLinked to original sources

PubMed2026

Association between orthostatic blood pressure change and masked and white coat hypertension: the Nagahama study.

BACKGROUND: Exaggerated blood pressure (BP) response to orthostatic stimuli is indicative of cardiovascular frailty and may be associated with masked and white coat hypertension, which are BP abnormalities associated with cardiovascular outcomes. We aimed to clarify this possible association in a cross-sectional analysis of a large general population. METHODS: We enrolled 7618 community residents (mean age: 57.7 years). Orthostatic BP change was calculated as the difference between systolic BP measured in a seated position and at 3 min after standing. Orthostatic hypertension and hypotension were defined as >20 mmHg increase or decrease in systolic BP, respectively. Masked and white coat hypertension were defined based on office and home morning BP measurements. RESULTS: The frequency of orthostatic hypotension and hypertension was 1.8% and 1.6%, respectively. A significant association was observed between orthostatic BP change and office-to-home BP differences, that is, the greater the increase in orthostatic BP, the higher the home BP than the office BP. The association between orthostatic hypertension and masked hypertension (crude odds ratio: 3.15; P  < 0.001) remained significant even after adjusting for potential covariates, including office seated BP. In addition, orthostatic hypotension was independently associated with white coat hypertension (crude odds ratio: 2.14; P  = 0.002). Orthostatic BP change measured at 3 min showed a clearer association with masked and white coat hypertension than that measured at 1 min. CONCLUSION: We identified a physiological association between exaggerated postural BP variability and office-to-home BP differences, which were previously considered unrelated.

Humans↗

PubMed2025

Genome-wide gene-sleep interaction study identifies novel lipid loci in 732,564 participants.

BACKGROUND AND AIMS: Deviations from the population mean in sleep duration have been associated with increased risk for developing dyslipidemia and atherosclerotic cardiovascular disease, but the mechanism of effect is poorly characterized. We performed large-scale genome-wide gene-sleep interaction analyses of lipid levels to identify genetic variants underpinning the biomolecular pathways of sleep-associated lipid disturbances and to suggest possible druggable targets. METHODS: We collected data from 55 cohorts with a combined sample size of 732,564 participants (87 % European ancestry) with data on lipid traits (high-density lipoprotein [HDL-c] and low-density lipoprotein [LDL-c] cholesterol and triglycerides [TG]). Short (STST) and long (LTST) total sleep time were defined by the extreme 20 % of the age- and sex-standardized values within each cohort. Based on cohort-level summary statistics data, we performed meta-analyses for one-degree of freedom tests of interaction and two-degree of freedom joint tests of the SNP-main and -interaction effect on lipid levels. RESULTS: The one-degree of freedom variant-sleep interaction test identified 10 novel loci (Pint<5.0e-9), and we additionally identify 7 loci within the two-degree of freedom analyses (Pjoint<5.0e-9 in combination with Pint<6.6e-6). Multiple loci, including those mapped to APSH (target for aspartic and succinic acid) and SLC8A1 showed biological plausibility and druggability potential based on literature. CONCLUSIONS: Collectively, the 17 (9 with short and 8 with long sleep) loci provided evidence into the biomolecular mechanisms underlying sleep-associated lipid changes, including potential involvement of the vitamin D receptor pathway. Collectively, these findings may contribute developing novel interventions for treating dyslipidemia in people with sleep disturbances.

Humans↗

PubMed2025

Effects of room temperature on home morning, evening, and sleep blood pressure: the Shizuoka study.

BACKGROUND: Cold ambient temperatures are known to increase blood pressure (BP), but the influence of room temperature remains understudied. This study examined the impact of room temperature in morning, evening, and sleep BP measured at home. METHODS: The study included 779 adults (mean age: 70.7 years) from a community-based longitudinal study. Home BP was measured for 1 week using a conventional cuff-oscillometric device, whereas sleep BP was automatically recorded at 00 : 00, 02 : 00, and 04 : 00 using a timer-equipped BP monitor. Room temperature was measured concurrently using a thermometer in the BP monitor. RESULTS: A 1°C decrease in room temperature increased morning systolic and diastolic BPs by 0.863 and 0.342 mmHg, respectively ( P  < 0.001). The evening systolic and diastolic BPs increased by 0.721 and 0.320 mmHg, respectively ( P  < 0.001). However, sleep systolic (0.076 mmHg, P = 0.181) and diastolic (0.078 mmHg, P  = 0.039) BPs showed weaker associations. The association between morning systolic and diastolic BPs remained significant after adjusting for ambient temperature (0.809 and 0.304 mmHg, respectively; P  < 0.001). Age was the only factor associated with room temperature-related BP changes. Among 433 normotensive individuals (based on 1-week average morning BP), 93 were hypertensive on the coldest day. These participants had higher average morning BPs within the normal range and were more likely to use antihypertensive medication. CONCLUSION: Room temperature significantly influenced home morning and evening BPs but not sleep BP, independent of ambient temperature. Maintaining appropriate room temperatures may aid in BP management at home.

Humans↗