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Search Results: 1 - 10 of 4933 matches for " Hayward MD "
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Life-course origins of the ages at menarche and menopause
Forman MR, Mangini LD, Thelus-Jean R, Hayward MD
Adolescent Health, Medicine and Therapeutics , 2013, DOI: http://dx.doi.org/10.2147/AHMT.S15946
Abstract: ourse origins of the ages at menarche and menopause Review (1325) Total Article Views Authors: Forman MR, Mangini LD, Thelus-Jean R, Hayward MD Published Date January 2013 Volume 2013:4 Pages 1 - 21 DOI: http://dx.doi.org/10.2147/AHMT.S15946 Received: 30 August 2012 Accepted: 26 October 2012 Published: 18 January 2013 Michele R Forman,1 Lauren D Mangini,1 Rosenie Thelus-Jean,2 Mark D Hayward3 1Nutritional Sciences, The University of Texas at Austin, Austin, TX, 2Office of the Surgeon General, Department of the Army, Washington DC, 3Population Research Center, The University of Texas at Austin, Austin, TX, USA Abstract: A woman's age at menarche (first menstrual period) and her age at menopause are the alpha and omega of her reproductive years. The timing of these milestones is critical for a woman's health trajectory over her lifespan, as they are indicators of ovarian function and aging. Both early and late timing of either event are associated with risk for adverse health and psychosocial outcomes. Thus, the search for a relationship between age at menarche and menopause has consequences for chronic disease prevention and implications for public health. This article is a review of evidence from the fields of developmental biology, epidemiology, nutrition, demography, sociology, and psychology that examine the menarche–menopause connection. Trends in ages at menarche and menopause worldwide and in subpopulations are presented; however, challenges exist in constructing trends. Among 36 studies that examine the association between the two sentinel events, ten reported a significant direct association, two an inverse association, and the remainder had null findings. Multiple factors, including hormonal and environmental exposures, socioeconomic status, and stress throughout the life course are hypothesized to influence the tempo of growth, including body size and height, development, menarche, menopause, and the aging process in women. The complexity of these factors and the pathways related to their effects on each sentinel event complicate evaluation of the relationship between menarche and menopause. Limitations of past investigations are discussed, including lack of comparability of socioeconomic status indicators and biomarker use across studies, while minority group differences have received scant attention. Suggestions for future directions are proposed. As research across endocrinology, epidemiology, and the social sciences becomes more integrated, the confluence of perspectives will yield a richer understanding of the influences on the tempo of a woman's reproductive life cycle as well as accelerate progress toward more sophisticated preventive strategies for chronic disease.
Life-course origins of the ages at menarche and menopause
Forman MR,Mangini LD,Thelus-Jean R,Hayward MD
Adolescent Health, Medicine and Therapeutics , 2013,
Abstract: Michele R Forman,1 Lauren D Mangini,1 Rosenie Thelus-Jean,2 Mark D Hayward31Nutritional Sciences, The University of Texas at Austin, Austin, TX, 2Office of the Surgeon General, Department of the Army, Washington DC, 3Population Research Center, The University of Texas at Austin, Austin, TX, USAAbstract: A woman's age at menarche (first menstrual period) and her age at menopause are the alpha and omega of her reproductive years. The timing of these milestones is critical for a woman's health trajectory over her lifespan, as they are indicators of ovarian function and aging. Both early and late timing of either event are associated with risk for adverse health and psychosocial outcomes. Thus, the search for a relationship between age at menarche and menopause has consequences for chronic disease prevention and implications for public health. This article is a review of evidence from the fields of developmental biology, epidemiology, nutrition, demography, sociology, and psychology that examine the menarche–menopause connection. Trends in ages at menarche and menopause worldwide and in subpopulations are presented; however, challenges exist in constructing trends. Among 36 studies that examine the association between the two sentinel events, ten reported a significant direct association, two an inverse association, and the remainder had null findings. Multiple factors, including hormonal and environmental exposures, socioeconomic status, and stress throughout the life course are hypothesized to influence the tempo of growth, including body size and height, development, menarche, menopause, and the aging process in women. The complexity of these factors and the pathways related to their effects on each sentinel event complicate evaluation of the relationship between menarche and menopause. Limitations of past investigations are discussed, including lack of comparability of socioeconomic status indicators and biomarker use across studies, while minority group differences have received scant attention. Suggestions for future directions are proposed. As research across endocrinology, epidemiology, and the social sciences becomes more integrated, the confluence of perspectives will yield a richer understanding of the influences on the tempo of a woman's reproductive life cycle as well as accelerate progress toward more sophisticated preventive strategies for chronic disease.Keywords: reproductive aging, growth, socioeconomic status, biomarker, ovarian function
Response to 'Border crossings: Papua New Guinea models in Irian Jaya' by Gabriele Styrzenhofecker (BKI 147-II/III)
Douglas Hayward
Bijdragen tot de Taal-, Land- en Volkenkunde , 1994,
Abstract: Discussion and debate
Failure Mechanisms in Wet Tantalum Capacitors
D. Hayward
Active and Passive Electronic Components , 1976, DOI: 10.1155/apec.2.249
Abstract:
On the Secondary Sexual Characters of Notiophilus
Roland Hayward
Psyche , 1905, DOI: 10.1155/1905/69487
Abstract:
The Katydid's Call in Relation to Temperature
Roland Hayward
Psyche , 1901, DOI: 10.1155/1901/12493
Abstract:
An Abnormal Specimen of Bembidium Scudderi
Roland Hayward
Psyche , 1904, DOI: 10.1155/1904/67026
Abstract:
Les Méduses dans la Marée de l’Histoire: L’Anse aux Meadows, Nan Sdins and Cultural Heritage Agendas
Philip Hayward
Island Studies Journal , 2008,
Abstract: This paper reflects upon the relation of island communities to global cultural heritage agendas through discussion of two particular examples, the first two island locations successfully nominated by the Canadian government for UNESCO World Heritage listing: L’Anse aux Meadows, on Newfoundland, and Nan Sdins (Ninstints) on SGang Gwaii . This reflection involves discussion of the motives and discourses that led to their formal establishment as cultural heritage sites and those that have come into play in subsequent social inscriptions and interpretations. This line of inquiry intersects with – and is illuminated by - a consideration of the spatial contexts of the island networks that have facilitated particular moments upon which their heritage status is based. In particular, I refer to their relation to sea-lanes and coastal/inter-island lines of contact that are, in turn, predicated on particular moments of climatic, navigational and socio-economic history. The paper concludes by offering a point of mediation between traditional concepts of heritage agendas and socio-cultural development in island communities pertinent to the development of Island Studies as an activist enterprise.
Numerical Solutions of Dilaton Gravity and the Semi-Classical Singularity
Justin Hayward
Physics , 1995, DOI: 10.1103/PhysRevD.52.7037
Abstract: A general homogeneous two dimensional dilaton gravity model considered recently by Lemos and S\` a, is given quantum matter Polyakov corrections and is solved numerically for several static, equilibrium scenarii. Classically the dilaton field ranges the whole real line, whereas in the semi-classical theory, with the usual definition, it is always below a certain critical value at which a singularity appears. We give solutions for both sub- and super-critical dilaton field. The pasting together of the spacetime on both sides of a singularity in semi-classical planar general relativity is discussed.
Quasilocal energy conditions
Geoff Hayward
Physics , 1994, DOI: 10.1103/PhysRevD.52.2001
Abstract: The classical value of the Hamiltonian for a system with timelike boundary has been interpreted as a quasilocal energy. This quasilocal energy is not positive definite. However, we derive a `quasilocal dominant energy condition' which is the natural consequence of the local dominant energy condition. We discuss some implications of this quasilocal energy condition. In particular, we find that it implies a `quasilocal weak energy condition'.
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