Masahiro Umezaki
Dados Biográficos
| ID | 77478 |
|---|---|
| NOME | Masahiro Umezaki |
| PRENOMES | Masahiro |
| SOBRENOME | Umezaki |
| ASSINATURA | UMEZAKI M |
| AFILIAÇÕES | The University of Tokyo |
| ORCID | 0000-0003-3733-3629 |
| VERIFICADO | Sim |
| TOTAL DE OBRAS | 52 |
| TOTAL DE CITAÇÕES | 43 |
| TOTAL COMO AUTOR | 52 |
| TOTAL COMO EDITOR | 0 |
| PRIMEIRO ANO DE PUBLICAÇÃO | 1995 |
| ANO MAIS RECENTE DE PUBLICAÇÃO | 2026 |
| ÍNDICE H | 4 |
Interindividual Variation in Chronic Inflammation in Northern Lao People's Democratic Republic
Livelihood and Dietary Transitions in Subsistence Populations of Northern Laos
Interindividual Variation in Adult Gut Microbiome Composition in Two Rural Communities in Japan
OBJECTIVES: The "Japanese diet" has long been regarded as a key factor contributing to the remarkable life expectancy of the Japanese population. Given that the gut microbiome is thought to mediate the link between diet and health, this study investigated energy and nutrient intake among rural populations in Japan, who are presumed to adhere closely to the traditional "Japanese diet," and examined their association with gut microbiome diversity a…
Physical Activity Levels Among Elderly Residents in Small Remote Islands in Japan
This study quantified the physical activity of older residents of two small remote Japanese islands and identified associated factors. A questionnaire survey and accelerometer measurements collected data from 79 participants aged ≥ 65 years on Kabashima and Hisakajima Islands in May–June 2024. The median daily step count was 4555, similar to or higher than national averages. Significant associations were found between physical activity levels and…
Associations of Dietary Inflammatory Index Scores with the disability status and subjective health of older adults living in non-urban municipalities in Nagasaki and Ishikawa Prefectures, Japan
Objective: To examine associations of Dietary Inflammatory Index (DII) scores with disability and subjective health, which is prognostic of disability, in a large, systematically sampled population of older adults living in non-urban areas in Japan. Design: Cross-sectional. The Tokyo Metropolitan Institute of Gerontology Index of Competence was used to assess disability. Both overall disability and disabilities in components of everyday competenc…
Social Relationships, Dietary Intake, and Health Status Among Residents of the Ojika Islands, Japan
Social relationships are vital for health. We studied residents of the Ojika Islands in Japan to examine how social ties relate to diet and health. Our results showed that, despite strong social bonds and frequent food exchanges compared to urban Japan, some residents are less socially engaged than others. This was confirmed by a cluster analysis of individual data on close relationships and food sharing: 105 adults were divided into the socially…
Transition to a market economy and chronic psychosocial stress in northern Laos
OBJECTIVES: The indigenous population in northern Laos has experienced a transition from self-sufficiency to a market-oriented economy, which may have brought about unprecedented chronic psychosocial stress. This study examined the association between the transition to a market economy and urinary free cortisol (UFC) concentration as a stress biomarker among rural residents of three villages with different degrees of integration into the market e…
Handwashing among caregivers of young children in a protracted and complex refugee and immigration context
Introduction: Protracted refugee situations create complex contexts that present significant health risks for young children. Effective hand hygiene practices by caregivers can reduce respiratory infections and diarrhoeal disease, the two largest contributors to mortality among children between 1 month and 5 years of age. This study documented handwashing patterns and access to water, sanitation and hygiene (WASH) infrastructure among caregivers …
A mini-ethnography of honey gathering
As part of the people's culture, the livelihood system, various community groups in Indonesia have been practicing stinging bees honey-gathering. Many studies have reported such activities quite widely. In the context of honey-gathering activities and somewhat different from other reports, this study describes the activities of collecting honey produced by stingless bees (Tetragonula sp.) practiced by honey collectors in Sumedang Regency, West Ja…
Uncovering Spatial Patterns and Temporal Trends in the Ageing of the Tokyo Metropolis Population
Urban populations are ageing, but the spatial and temporal distribution of the older adult population is highly heterogeneous, which has implications for resource allocation, service provision, and infrastructure needs. Based on the method proposed by Atkins & Tonts (2016), we used the interplay between changes in the number and proportion of the older adult population to identify population ageing types: accumulation (both the number and proport…
Impact of modernization on urinary concentrations of arsenic, cadmium, lead, and selenium in rural residents of Northern Laos
OBJECTIVES: The impacts of modernization on toxic heavy metal exposure and essential trace element intake in indigenous populations of subsistence societies are unknown. We assessed urinary trace element concentrations in rural residents of Northern Laos and examined associations with levels of modernization. METHODS: A cross-sectional study was conducted comprising 380 residents of three villages in Northern Laos with different levels of moderni…
Food store accessibility affects nutritional intake through shopping frequency and food intake in middle‐aged to older adults in rural Nagasaki, Japan
OBJECTIVES: The food environment is an important determinant of dietary and nutritional intake, but studies thus far have reported mixed results. We examined associations between food store accessibility and nutritional intake among middle-aged to older adults in rural Japan using data from a questionnaire survey of national health insurance enrollees. METHODS: The survey was conducted in Nagasaki, Japan, for individuals aged 40-74 years. Direct …
Divergence in Nutritional Intake and Physical Activity Patterns Among Households in a Village of Ethnic Minorities in Northern Laos at the Initial Stage of Health Transition
Association between the dietary inflammatory index and disability in Japanese older people
Objectives: To examine the demographic and lifestyle characteristics related to the dietary inflammatory index (DIITM) score and to evaluate the association between DII score and disability among older people in Japan. Design: Cross-sectional design. The DII score was calculated from nutrient intake information obtained from a FFQ. Disability was assessed using the Tokyo Metropolitan Institute of Gerontology Index of Competence questionnaire. Ove…
Factors Affecting Undernutrition among School Children in Cebu, Philippines
School children in vulnerable areas continue to be at risk for undernutrition. This study investigated the factors associated with the nutritional status of school children in a rural municipality in Cebu, Philippines. Children aged 6-12 years (n = 327) and their parents were asked to participate. Children's anthropometric measurements were taken in schools, while interviews and measurements of parents were conducted at home. Children's nutrition…
Assessment of intra- and inter-assay variation in dried blood spot telomere length measurements by qPCR
Telomere length has recently gained popularity as a biomarker of aging-related diseases. Dried blood spot (DBS) samples are commonly used to measure telomere length for human biology research, but studies assessing intra- and inter-assay variations are scarce. The objective of the present study was to analyze and elucidate the extent of intra- and inter-assay variation of DBS telomere length measurement. The DBS telomere length of a male subject …
Associations between neighborhood food environments and deficient protein intake among elderly people in a metropolitan suburb
OBJECTIVES: Living in a poor food environment and its association with an increased risk of inadequate nutrient intake are increasingly important issues in Japan due to an increase in the elderly population. METHODS: The present study examined the relationships between neighborhood food environment and the protein and fat intakes of elderly Japanese individuals (n = 181) living in the metropolitan Tokyo suburb of Kisarazu. RESULTS: A logistic reg…
Reduced morning cortisol concentration in saliva was associated with obesity
OBJECTIVES: This study investigated morning salivary cortisol concentration in relation to total body fat composition among community-dwelling Papua New Guinean adults. METHODS: In addition to demographic and anthropometric measurements, saliva was collected in a single morning from 478 residents in Eastern Highlands Province and Madang Province. RESULTS: After adjusting for age, region, and occupation, the morning salivary cortisol concentration…
Medical Pluralism and Traditional/Complementary and Alternative Medicine Use Among Older People
Association between sex inequality in animal protein intake and economic development in the P apua N ew G uinea highlands
OBJECTIVES: People in the Papua New Guinea Highlands consume sweet potatoes as their dietary staple; consumption of animal protein is limited. In such societies with marginal protein intake, the intra-household allocation of animal protein in terms of sex or age is of importance. The objective of this study was to investigate how the allocation pattern of protein-rich foods by sex and age is associated with economic development in the Papua New G…
Secondary Sex Ratio and Marriage After Disaster
Development, validation, and use of a semi‐quantitative food frequency questionnaire for assessing protein intake in Papua New Guinean Highlanders
OBJECTIVES: The aim of this article was to develop a semi-quantitative food frequency questionnaire (FFQ) and evaluate its validity to estimate habitual protein intake, and investigate current dietary protein intakes of Papua New Guinea (PNG) Highlanders. METHODS: A 32-item FFQ was developed and tested among 135 healthy male and female volunteers. The FFQ-estimated daily total and animal protein intakes were compared with biomarkers and 3-day Wei…
Association of protein intakes and variation of diet‐scalp hair nitrogen isotopic discrimination factor in P apua New G uinea highlanders
OBJECTIVES: We present new nitrogen isotopic discrimination factor between diets and scalp hairs (Δ(15) NHair-Diet : δ(15) NHair - δ(15) NDiet ) for indigenous residents in three communities in the Papua New Guinea Highlands who consumed various amounts and qualities of protein. The Δ(15) N is important for precise evaluation of the dietary habits of human populations; in both contemporary and traditional lifestyles. Several hypotheses have been …
Impact of the 2011 Earthquake on Marriages, Births and the Secondary Sex Ratio in Japan
On 11th March 2011 a magnitude nine earthquake struck the Tohoku region of Japan. The earthquake resulted in a large tsunami and an accident at the Fukushima Nuclear Power Plant. Previous studies have suggested that demographic indices relating to reproduction and marriage change after such massive disasters (e.g. large earthquakes). The present study investigated whether the number of births, number of marriages and the secondary sex ratio (SSR)…
Impact of lifestyle changes on stress in a modernizing rural population in Hainan Island, China
OBJECTIVE: Little is known about inter-individual variation in psychological stress in modernizing rural populations in developing countries. The objective of this study was to investigate the association between Epstein-Barr virus (EBV) antibody titer, a biomarker of psychological stress, and lifestyle parameters in rural communities in Hainan Island, China. METHODS: EBV antibody titer was measured in dried blood spot (DBS) samples collected fro…
Impact of Population Pressure on Food Production
Adaptive Strategies of Highlands-Origin Migrant Settlers in Port Moresby, Papua New Guinea
Association between sex inequality in animal protein intake and economic development in the P apua N ew G uinea highlands
OBJECTIVES: People in the Papua New Guinea Highlands consume sweet potatoes as their dietary staple; consumption of animal protein is limited. In such societies with marginal protein intake, the intra-household allocation of animal protein in terms of sex or age is of importance. The objective of this study was to investigate how the allocation pattern of protein-rich foods by sex and age is associated with economic development in the Papua New G…
Emergence of income inequality and its impact on subjective quality of life in an ethnic minority community in Hainan Island, China
To understand the complex process underlying the emergence and growth of inequality in a population and its impact on individuals' subjective quality of life (QOL), the authors conducted fieldwork in 2001 and 2009 in a rural minority community in Hainan Island, China. The tourism industry, which developed in 2001, provided paid jobs for half of the adult men in 2009. Responses on the abbreviated version of the World Health Organization Quality of…
Inter-household variation in adoption of cash cropping and its effects on labor and dietary patterns
Following the economic development policy of China since the 1980s, the indigenous food production systems of communities have been transformed to a market economy. The introduction of cash crops has been the major developmental policy of China's rural areas. Despite the overall improvement of economic status among farmers over the last two decades, inequality among households has emerged as a new problem. In the present study, we investigated th…
Long-term subsistence adaptation to the diversified Papua New Guinea environment
Association of protein intakes and variation of diet‐scalp hair nitrogen isotopic discrimination factor in P apua New G uinea highlanders
OBJECTIVES: We present new nitrogen isotopic discrimination factor between diets and scalp hairs (Δ(15) NHair-Diet : δ(15) NHair - δ(15) NDiet ) for indigenous residents in three communities in the Papua New Guinea Highlands who consumed various amounts and qualities of protein. The Δ(15) N is important for precise evaluation of the dietary habits of human populations; in both contemporary and traditional lifestyles. Several hypotheses have been …
Significant sex difference in the association between C‐reactive protein concentration and anthropometry among 13‐ to 19‐year olds, but not 6‐ to 12‐year olds in Nepal
Life history theory predicts a trade‐off between immunostimulation and growth. Using a cross‐sectional study design, this study aims to test the hypothesis that C‐reactive protein (CRP) is negatively associated with height‐for‐age z ‐scores (HAZ scores) and BMI‐for‐age z ‐scores (BAZ scores) among 6‐ to 19‐year olds ( N = 426) residing in five Nepalese communities. Dried blood spot (DBS) samples were collected and assayed for CRP using an in‐hous…
Assessment of intra- and inter-assay variation in dried blood spot telomere length measurements by qPCR
Telomere length has recently gained popularity as a biomarker of aging-related diseases. Dried blood spot (DBS) samples are commonly used to measure telomere length for human biology research, but studies assessing intra- and inter-assay variations are scarce. The objective of the present study was to analyze and elucidate the extent of intra- and inter-assay variation of DBS telomere length measurement. The DBS telomere length of a male subject …
Medical Pluralism and Traditional/Complementary and Alternative Medicine Use Among Older People
Long-term subsistence adaptation to the diversified Papua New Guinea environment
Impact of Rural-Urban Migration on Fertility
The Anjangmui dialect group of the Kombio in Papua New Guinea has experienced a rapid increase in rural-urban migration since European contact commenced in the 1930s. Population ecology analyses of birth and migration histories for 240 Anjangmui women showed a higher total marital fertility rate in the cohort born in 1940-59 than that born in 1920-39. A decline in the age at menarche for nutritional reasons, and reduction in the birth interval fo…
Diet among the Huli in Papua New Guinea highlands when they were influenced by the extended rainy period
Household food consumption surveys (weighed records for 7 days) were conducted in two Huli‐speaking communities, Heli in the slope zone and Wenani in the flat plain, in Papua New Guinea Highlands when their food productivity had decreased after an extended rainy period in 1994. Despite lowered productivity of garden crops in both communities, daily adult male energy and protein intakes in Wenani (12930 kJ, 3090 kcal and 56 g, respectively) exceed…
Daily Time Budgets of Long-Distance Commuting Workers in Tokyo Megalopolis
In Tokyo Megalopolis, long-distance commuting between residences in the suburbs and work places in the centre of the city was examined. Using a questionnaire, heads of household in two suburbs were asked about the influences of long commuting hours on their daily time budgets. The results showed that on workdays, the workers who spent longer commuting rose and left home for work earlier, and came back home and retired later; accordingly, both tim…
Cardiovascular risk factors of migrants in Port Moresby from the highlands and island villages, Papua New Guinea
This study examined cardiovascular disease (CVD) risk factors, i.e., obesity, blood pressures, and serum lipoproteins and apoproteins, in relation to sociocultural characteristics in two rural-urban migrant populations (n = 173 adult males and females) in Port Moresby, the capital of Papua New Guinea. Tari migrants from the highlands and Balopa migrants from the islands differ genetically. More importantly, the lifestyle of the latter is more Wes…
Impact of Population Pressure on Food Production
Protein content and amino acid scores of sweet potatoes in Papua New Guinea Highlands
Protein content and amino acid scores of sweet potatoes were determined in Papua New Guinea Highlands where sweet potatoes contributed approximately 50% of the total protein intake. Major cultivars of sweet potatoes in the Tari basin and the Asaro valley, 15 in total, were sampled and their nitrogen and amino acid contents were analyzed. Sweet potatoes in the Tari basin and the Asaro valley contained, respectively, 1.4% and 0.8% of protein in fre…
Physical activity and subsistence pattern of the Huli, a Papua New Guinea Highland population
Several studies on human energetics have been conducted in developed and developing countries, but very few simultaneously measured time use and energy expenditure. Only a few quantitatively compared subsistence patterns between rural and urban dwellers of an identical population. Here we present the daily physical activity level (PAL), physical exertion, time, and energy expenditure in contrasting subsistence/occupational activities of Papua New…
Time Allocation to Subsistence Activities Among the Huli in Rural and Urban Papua New Guinea
Time spent on subsistence activities was compared between rural sedentes and urban migrants of the Huli population in Papua New Guinea. Person-day observation data were collected for rural sedentes (441) in the Tari basin and for urban migrants in Port Moresby (175). The time spent on subsistence activities by males was longer in the urban area than in rural areas, while that by females was similar in both areas. Conspicuous gender inequality wit…
Changing Migration Patterns of the Huli in the Papua New Guinea Highlands
On the basis of interviews in 2 Huli-speaking villages in the Papua New Guinea Highlands, genealogical charts for 1678 persons, alive or dead, representing 5 generations, were reconstructed to investigate the change in intrapopulation migration patterns in response to modernization and environmental degradation in their habitats. Migration flows from less modernized and thinly populated areas to more modernized and densely populated areas predomi…
Adaptive Strategies of Highlands-Origin Migrant Settlers in Port Moresby, Papua New Guinea
No difference in serum leptin concentrations between urban-dwelling Austronesians and Non-Austronesians in Papua New Guinea
Pacific Islands populations can be broadly divided into Austronesians (AN) and Non-Austronesians (NAN); obesity and type 2 diabetes are prevalent in the former, although leptin levels in both groups have seldom been investigated. Thirty-seven (20 male and 17 female) adult pairs, matched by age and percent body fat, from AN-speaking Balopa and NAN-speaking Huli, all of whom migrated to settle in Port Moresby, the capital of Papua New Guinea, were …
Inter-household variation in adoption of cash cropping and its effects on labor and dietary patterns
Following the economic development policy of China since the 1980s, the indigenous food production systems of communities have been transformed to a market economy. The introduction of cash crops has been the major developmental policy of China's rural areas. Despite the overall improvement of economic status among farmers over the last two decades, inequality among households has emerged as a new problem. In the present study, we investigated th…
Association of Household Demographic Variables With Child Mortality in Côte D’ivoire
The associations between household demographic variables and mortality of children aged less than five years were investigated using data from the 1998 Demographic and Health Survey (DHS) of the Republic of Côte d’Ivoire, Western Africa. Of the total of 1992 children born to women included in the study population during the 5-year period preceding the survey, 260 (13%) had died and 1732 (87%) were alive at the time of the survey. Logistic regress…
Mutual interaction between nutritional status and chronic arsenic toxicity due to groundwater contamination in an area of Terai, lowland Nepal
Objective: To reveal the inter-relationship between nutritional status and arsenic toxicity. Design: Cross-sectional study. Setting: A survey in an area of lowland Nepal, where a high prevalence of both skin manifestation and malnutrition was observed. Daily arsenic intake was estimated by measuring the arsenic concentration and daily consumption of the drinking water. Participants: Adult villagers (248 men and 291 women). About half were classif…
Twenty Years’ Demographic Change in Sedentes and Migrants of an International Migrant-Sending Community in Tonga
In the Kingdom of Tonga, migration to overseas developed countries has prevailed. To elucidate the effects of migration on population dynamics, an interview survey was conducted in the migrant-sending community of Kolovai, in the outer region of Tongatapu Island. All births, deaths, marriages and in- and out-migrations that took place between 1983 and 2002 were recorded for all members of the ‘Kolovai population’, consisting of persons who had li…
Behavioral and nutritional factors and geohelminth infection among two ethnic groups in the Terai region, Nepal
Geohelminthiasis is a major health problem in many developing countries. This study was designed to evaluate the role of behaviors and the nutritional status of people with geohelminth infection in two indigenous ethnic groups in lowland Terai, Nepal. One hundred and fourteen individuals (55 Mushar and 59 Tharu) aged 20–60 years participated, and a structured questionnaire was used to investigate socioeconomic status and behaviors. Nutritional st…
Changing Adaptive Strategies of Two Li Ethnic Minority Villages in a Mountainous Region of Hainan Island, China
Energy and Nutrient Intake of Tongan Adults Estimated by 24-Hour Recall
Tongan adults show one of the highest prevalences of obesity in the world. The present study aims to estimate Tongans' energy and nutrient intakes and food sources using a 24-hour recall survey for 14 days targeting 15 men and 19 women. The mean (SD) daily energy intake was 12.2 (2.3) MJ for men and 10.6 (2.2) MJ for women. Imported foods accounted for about half of their energy and macronutrient intakes, but for much less of their micronutrients…
Emergence of income inequality and its impact on subjective quality of life in an ethnic minority community in Hainan Island, China
To understand the complex process underlying the emergence and growth of inequality in a population and its impact on individuals' subjective quality of life (QOL), the authors conducted fieldwork in 2001 and 2009 in a rural minority community in Hainan Island, China. The tourism industry, which developed in 2001, provided paid jobs for half of the adult men in 2009. Responses on the abbreviated version of the World Health Organization Quality of…
Diet Among People in the Terai Region of Nepal, an Area of Micronutrient Deficiency
In the Terai region, despite its ecological richness, the people have long suffered from a deficiency of micronutrients such as vitamin A, iron and zinc. The aim of this study was to investigate dietary and nutritional intakes among people in the Terai region of Nepal. The results were compared by sex and ethnicity. Food consumption surveys (one-day weighed records) were conducted among 114 people (55 Mushar and 59 Tharu ). Nutritional intakes we…
Diet and physical activity among migrant Bougainvilleans in Port Moresby, Papua New Guinea
OBJECTIVES: Obesity and hypertension are increasing in Papua New Guinea. This study investigated the association of dietary pattern and physical activity level with anthropometric measurements and blood pressure in migrant Bougainvilleans in the capital city of Port Moresby. METHODS: Adults who had moved from Naasioi territory on Bougainville Island and resided in Port Moresby during the study period were studied (n = 70). The International Physi…
Geographic Clustering of the Secondary Sex Ratio in Japan
The secondary sex ratio (SSR) has been suggested to decrease with adverse physical and psychological environments. Previous studies have focused on reduced SSR under adverse conditions, such as war, terrorism attack and earthquake, but few studies have investigated fluctuations in SSR in moderately adverse environments. This study analysed municipality-level vital statistics records in Japan collected between 1998 and 2002 to identify high-SSR cl…
Impact of the 2011 Earthquake on Marriages, Births and the Secondary Sex Ratio in Japan
On 11th March 2011 a magnitude nine earthquake struck the Tohoku region of Japan. The earthquake resulted in a large tsunami and an accident at the Fukushima Nuclear Power Plant. Previous studies have suggested that demographic indices relating to reproduction and marriage change after such massive disasters (e.g. large earthquakes). The present study investigated whether the number of births, number of marriages and the secondary sex ratio (SSR)…
Impact of lifestyle changes on stress in a modernizing rural population in Hainan Island, China
OBJECTIVE: Little is known about inter-individual variation in psychological stress in modernizing rural populations in developing countries. The objective of this study was to investigate the association between Epstein-Barr virus (EBV) antibody titer, a biomarker of psychological stress, and lifestyle parameters in rural communities in Hainan Island, China. METHODS: EBV antibody titer was measured in dried blood spot (DBS) samples collected fro…
Demography (30 obras) · Geography (30 obras) · Medicine (29 obras) · Sociology (22 obras) · Biology (19 obras) · Environmental health (18 obras) · Population (16 obras) · Gerontology (15 obras) · Socioeconomics (14 obras) · Agriculture (11 obras)