Yuki Someya's research while affiliated with Juntendo University and other places

Publications (99)

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Introduction: Metabolic syndrome (MetS) is defined as a complex of interrelated risk factors for type 2 diabetes and cardiovascular disease, including glucose intolerance, abdominal obesity, hypertension, and dyslipidemia. Studies using diffusion tensor imaging (DTI) have reported white matter (WM) microstructural abnormalities in MetS. However, i...
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Abstract This study aimed to assess (1) blood pressure between young, current athletes, and non‐athletes early in life; (2) hypertension prevalence between former athletes and the general population later in life; and (3) understand the mechanisms between exercise training and hypertension risks in the form of DNA methylation. Study 1: A total of 3...
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Background & Aims Coexistence of obesity and decreased muscle strength, defined as sarcopenic obesity, is often observed in the older adults. The present study investigated whether sarcopenic obesity, defined as reduced handgrip strength and increased body mass index (BMI), is associated with cognitive impairment. Methods Study participants includ...
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We investigated effects of exercise habits (EHs) in adolescence and old age on osteoporosis prevalence and hip joint and lumbar spine bone mineral density (BMD). Body composition and BMD in 1596 people aged 65–84 years living in Bunkyo-ku, Tokyo, were measured using dual-energy X-ray absorptiometry. We divided participants into four groups by a com...
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This study aimed to examine the combined effect of voluntary exercise and screen time during the first wave of the coronavirus disease 2019 (COVID-19) restrictions on subsequent grip strength among health and sports science students in Japan. The participants performed grip strength tests and had their weight assessed on 21 October 2020. Furthermor...
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Background Among former Olympic-level athletes, engagement in different sport disciplines has been associated with mortality risk in subsequent years. However, limited evidence is available on whether engagement in different sport disciplines at a young age is associated with locomotive syndrome (LS) risk later in life. This study examined the rela...
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BACKGROUND AND PURPOSE: Hypertension may be related to alterations of the glymphatic system, a waste metabolite drainage system in the brain. We aimed to investigate analysis along the perivascular space index changes in elderly subjects with hypertension. MATERIALS AND METHODS: Diffusion-weighted images were acquired from 126 subjects, including 6...
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Insulin resistance and muscle weakness are risk factors for silent lacunar infarcts (SLI), but it is unclear whether they are still independent risk factors when adjusted for each other. In addition, the effect of their combination on SLI is completely unknown. We evaluated SLI, insulin sensitivity, and knee extensor muscle strength by magnetic res...
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Background: Decreased insulin clearance could be a relatively upstream abnormality in obesity, metabolic syndrome, and nonalcoholic fatty liver disease. Previous studies have shown that sodium-glucose cotransporter 2 inhibitor (SGLT2i) increases insulin-C-peptide ratio, a marker of insulin clearance, and improves metabolic parameters. We evaluated...
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Background: Estimating the nutritional content of food is essential for self-management in people with type 2 diabetes mellitus, but it is a difficult skill to learn. The aim of this study was to investigate how diabetes management was impacted by the ability of patients to search for items they ate from a database of 26,300 different foods, and t...
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The volumes of intracranial tissues of 40 healthy volunteers acquired from 0.3- and 3-T scanners were compared using intraclass correlation coefficients, correlation analyses, and Bland-Altman analyses. We found high intraclass correlation coefficients, high Pearson’s correlation coefficients, and low percentage biases in all tissues and most of th...
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The cover image is based on the Original Article A decrease in plasma glucose levels is required for increased endogenous glucose production with a single administration of a sodium‐glucose co‐transporter‐2 inhibitor tofogliflozin by Nozomu Yamasaki et al., https://doi.org/10.1111/dom.14312.
Preprint
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Background: Previous studies showed that insulin resistance and reduced muscle strength are risk factors for silent lacunar infarcts, but it is unclear whether they are still independent risk factors when adjusted for each other. In addition, the effect of their combination on silent lacunar infarcts is completely unknown. Methods: We evaluated sil...
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Aims Olfactory dysfunction is associated with the transition from normal cognition to dementia in persons without type 2 diabetes. This study aimed to investigate whether olfactory dysfunction could be an early marker of future dementia in older patients with type 2 diabetes. Methods This exploratory study included 151 older Japanese outpatients w...
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Background Physical fitness and motor ability are associated with the incidence of locomotive syndrome (LS) in older adults. The relationships between physical fitness and motor ability at a young age to LS risk in later life remain unclear. This study examined the association between physical fitness and motor ability among university students and...
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Objective In Japan, while it is known that underweight women over the age 40 years have a high risk for type 2 diabetes, there is a lack of clarity on the association between glucose tolerance and underweight in younger women. Accordingly, we aimed to investigate the prevalence and features of impaired glucose tolerance (IGT) in young Japanese unde...
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Context Adipose tissue dysfunction is characterized by decreased adiponectin (AN) levels and impaired adipose tissue insulin sensitivity (ATIS), and is associated with metabolic disorders. While Asians readily develop metabolic disease without obesity, it remains unclear how decreased AN level and impaired ATIS affect metabolic abnormalities in non...
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Aims: A single administration of an SGLT2 inhibitor (SGLT2i) has been shown to decrease levels of plasma glucose (PG) and insulin and increase glucagon levels and endogenous glucose production (EGP). However, the underlying mechanisms have not been clarified yet. We investigate whether these changes are elicited by the decrease in PG levels induce...
Preprint
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Background: Among former Olympic-level athletes, engagement in different sport disciplines is associated with reduced mortality risk in subsequent years. However, limited evidence is available on whether engagement in different sport disciplines at a young age is associated with locomotive syndrome (LS) risk later in life. This study examined the r...
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Aims/Introduction As a low‐carbohydrate diet and the use of sodium–glucose transporter‐2 inhibitors are both known to increase D‐beta‐hydroxybutyrate levels, the effect of these levels on glucose metabolism has attracted attention. We investigated the acute effects of ketone monoester (KM) ingestion on blood glucose levels during the 75‐g oral gluc...
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Objectives: Quantitative synthetic magnetic resonance imaging (MRI) enables the determination of fundamental tissue properties, namely, T1 and T2 relaxation times and proton density (PD), in a single scan. Myelin estimation and brain seg- mentation based on these quantitative values can also be performed automatically. This study aimed to reveal th...
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IntroductionReduced muscle strength is a high risk factor for type 2 diabetes mellitus, and this association is especially strong in non-obese male individuals. However, it remains unclear how reduced muscle strength affects susceptibility to diabetes. We have examined whether lower limb muscle strength is associated with insulin resistance in non-...
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Aim/Introduction There are few studies to investigate between the relationship between macronutrients and longitudinal changes in arterial stiffness in patients with type 2 diabetes mellitus. This exploratory study sought to determine whether macronutrients were correlated with increased arterial stiffness independently of conventional atherosclero...
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Silent lacunar infarcts (SLIs) are often incidentally diagnosed by brain magnetic resonance imaging in elderly people and are associated with the future onset of stroke, dementia, and frailty. While decreased muscle strength was reported as a risk factor for stroke, it is still unclear whether it also predisposes to SLI. In this study, we investiga...
Preprint
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Background: Physical fitness and motor ability are associated with the incidence of locomotive syndrome (LS) in older adults. The relationship between physical fitness and motor ability at a young age and LS risk in later life remains unclear. This study examined the association between physical fitness and motor ability among university students a...
Preprint
Full-text available
Background Physical fitness and motor ability are associated with the incidence of locomotive syndrome (LS) in the elderly. The relationship between physical fitness and motor ability at a young age and LS risk in later life remains to be clarified. This study examined the association between physical fitness and motor ability among university stud...
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Accumulation of intramyocellular lipid (IMCL) is observed in individuals with insulin resistance as well as insulin-sensitive endurance athletes with high peak oxygen consumption (VO2peak), which is called the athlete’s paradox. It remains unclear whether non-athletes with higher fitness levels have IMCL accumulation and higher insulin sensitivity...
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Elevated 1‐hour plasma glucose (1h‐PG) (≥155 mg/dL) during an oral glucose tolerance test (OGTT) is a risk factor for type 2 diabetes. However, the metabolic characteristics of nonobese Asians with elevated 1h‐PG are unknown. Thus, we studied 59 nonobese Japanese men with normal glucose tolerance. We divided study participants into the Low 1h‐PG gr...
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Subjects with a monophasic glucose‐response‐curve (GRC) during a 75 g oral glucose tolerance test have a higher risk for type 2 diabetes than those with a biphasic GRC. However, no studies have addressed the association between GRC type and insulin clearance. Thus, we studied 49 healthy nonobese Japanese men. We divided study participants into the...
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Objective While certain lifestyle habits may be associated with arterial stiffness, there is limited literature investigating the relationship between lifestyle habits and longitudinal changes in arterial stiffness in patients with type 2 diabetes mellitus (T2DM). This is an exploratory study to determine whether lifestyle habits, in addition to co...
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Purpose The proportion of elderly individuals (age ≥65 years) in Japan reached 27.7% in 2017, the highest in the world. A serious social problem in a super-aged society is the rise in the number of elderly people who need long-term care (LTC), which is mainly due to cerebrovascular disease, dementia, age-related frailty, falls and fractures, and jo...
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Sport university students are a unique population because they usually have a strong sport background since early childhood. This study aimed to examine secular trends in grip strength of sport university students in comparison with the normal Japanese population between 1973 and 2016. Existing data on the grip strength of 6,308 sport university st...
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Context Circulating C-peptide is generally suppressed by exogenous insulin infusion. However, steady-state serum C-peptide (SSSC) levels during hyperinsulinemic-euglycemic clamp in obese subjects are higher than in healthy subjects, which may contribute to hyperinsulinemia to compensate for insulin resistance. Even in healthy subjects, inter-indivi...
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Context Adipose tissue insulin resistance has been observed in obese subjects and is considered an early metabolic defect that precedes insulin resistance in muscle and liver. Although Asians can readily develop metabolic disease without obesity, the clinical features of nonobese, apparently healthy, Asians with reduced adipose tissue insulin sensi...
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Context Asians have a high prevalence of insulin resistance (IR), even in the non-obese state. While both visceral fat accumulation (VFA) and fatty liver (FL) have been shown to be associated with IR, it is still unclear which is a better marker to predict insulin resistance in non-obese Asians. Objective The aim of this study was to investigate t...
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Metabolic clearance rate of insulin (MCRI) is thought to help maintain glucose homeostasis even in healthy subjects. However, the effect of a low carbohydrate/high fat (LCHF) diet on MCRI in healthy subject remains unclear. To investigate the effect of a 3-day eucaloric LCHF diet on MCRI in healthy subjects, we studied 42 healthy non-obese Japanese...
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Background: There is a high incidence of type 2 diabetes in Asian adults, even those with a normal body mass index (BMI) (<25.0 kg/m2). For example, it has been shown that a slightly increased BMI (>23 kg/m2) at middle age is a risk factor for type 2 diabetes in Asians. In this historical cohort study, we investigated whether a slightly increased...
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Type 2 diabetes (T2DM) is easily developed in Asian adults with normal body mass index (BMI), compared with other ethnicities with similar BMI. For example, it has been shown that slightly increased BMI level (>23 kg/m2) in middle age (around 50 years old) is a risk for development of T2DM in Asians. However, it is still unclear whether slightly el...
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Purpose We aimed to clarify the onset of diabetes. Methods Data from 27,392 non-diabetic health examinees was retrospectively analyzed for a mean of 5.3 years. Trajectories of fasting plasma glucose (FPG), body mass index (BMI) and the single point insulin sensitivity estimator (SPISE), an index of insulin sensitivity (Si), 10 years prior to diagn...