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Alterations in IGF-I affect elderly: role of physical activity

Sagiv, Moran and Yamin, Chen and Amir, Ruthie and Eynon, Nir (2007) Alterations in IGF-I affect elderly: role of physical activity. European Review of Aging and Physical Activity, 4 (2). pp. 77-84. ISSN 1813-7253

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Abstract

The growth hormone–insulin-like growth factor I (IGF-I) axis is an important physiological regulator muscle for development. Although there is evidence that aging muscle retains the ability to synthesize IGF-I, there is also evidence that aging may be associated with attenuation of the ability of exercise to induce an isoform of IGF-I that promotes satellite cell proliferation. However, it is clear that overexpression of IGF-I in the muscle can protect against age-related sarcopenia. Strength training appears to be the intervention of choice for the prevention and treatment of sarcopenia. IGF-I has been implicated in the loss of the muscle with age, and IGF-I expression levels change as a consequence of strength training in older adults. However, it seems that advancing age, rather than declining serum levels of IGF-I, appears to be a major determinant of lifetime changes in body composition in women and men. We concluded that resistive exercise is a significant determinant of muscle mass and function. Elevated levels of IGF-I have been found in physically active compared to sedentary individuals. Recent work suggests that IGF-I as a mediator plays an important role in muscle hypertrophy and angiogenesis, both of which characterize the anabolic adaptation of muscles to exercise.

Item Type: Article
Uncontrolled Keywords: ResPubID25146, aerobic exercise, aging, ageing, growth factors Resistive training . Sarcopenia
Subjects: Faculty/School/Research Centre/Department > Institute of Sport, Exercise and Active Living (ISEAL)
FOR Classification > 1106 Human Movement and Sports Science
Depositing User: VUIR
Date Deposited: 07 Dec 2012 04:28
Last Modified: 07 Dec 2012 04:28
URI: http://vuir.vu.edu.au/id/eprint/10510
DOI: 10.1007/s11556-007-0022-1
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Citations in Scopus: 0 - View on Scopus

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