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• W1577971570 abstract "Sarcopenia is characterized by a progressive generalized decrease of skeletal muscle mass, strength and function with aging. Recently, the genetic determination has been associated with muscle mass and muscle strength in elderly. These two phenotypes of risk are the most commonly recognized and studied for sarcopenia, with heritability ranging from 30 to 85% for muscle strength and 45-90% for muscle mass. It is well known that the development and maintenance of muscle mass in early adulthood reduces the risk of developing sarcopenia and leads to a healthy aging. For that reason it seems important to identify which genetic factors interact with aging and in particular with the musculoskeletal response to exercise in such individuals. This review is designed to summarize the most important and representative studies about the possible association between certain genetic polymorphisms and muscle phenotypes in older populations. Also we will focuses on nutrition and some concerns associated with aging, including the role that exercise can have on reducing the negative effects of this phenomenon. Some results are inconsistent between studies and more replication studies underlying sarcopenia are needed, with larger samples and with different life cycles, particularly in the type and level of physical activity throughout life. In future we believe that further progress in understanding the genetic etiology and the metabolic pathways will provide valuable information on important biological mechanisms underlying the muscle physiology. This will enable better recognition of individuals at higher risk and the ability to more adequately address this debilitating condition.Sarcopenia é caracterizada por uma diminuição generalizada e progressiva da força, massa e função muscular com o envelhecimento. Recentemente, a determinação genética tem sido associada com a massa muscular e força muscular em idosos. Estes dois fenótipos de risco são os mais comumente reconhecidos e estudados em relação à sarcopenia, com hereditariedade variando de 30 a 85% para a força muscular e 45-90% para a massa muscular. É bem conhecido que o desenvolvimento e manutenção da massa muscular na idade adulta reduz o risco de desenvolver sarcopenia e conduz a um envelhecimento saudável. Por isso, é importante identificar quais os fatores genéticos que interagem com o envelhecimento e, em particular, com a resposta músculo-esquelética ao exercício. Esta revisão destina-se a resumir os estudos mais importantes e representativos sobre a possível associação entre determinados polimorfismos genéticos e fenótipos musculares nas populações mais velhas. Os aspetos nutricionais serão discutidos, incluindo o papel que o exercício pode ter sobre a redução dos efeitos negativos deste fenômeno. Alguns resultados são inconsistentes e desta forma é necessária uma maior replicação subjacente à sarcopenia, com amostras maiores e em diferentes ciclos da vida, especialmente no tipo e nível de atividade física. No futuro, acreditamos que mais progressos na compreensão da etiologia genética e as vias metabólicas vai fornecer informações valiosas sobre importantes mecanismos biológicos envolvidos na fisiologia muscular. Isto irá permitir um melhor reconhecimento dos indivíduos com maior risco e uma maior capacidade de enfrentar adequadamente essa condição debilitante." @default.
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• W1577971570 date "2013-05-24" @default.
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• W1577971570 title "Muscle tissue changes with aging." @default.
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