Ann Rehabil Med.  2015 Apr;39(2):155-162. 10.5535/arm.2015.39.2.155.

Aging of Skeletal Muscle Fibers

• Miljkovic
• Lim JY
• Miljkovic
• Frontera W

• KMID: 2273035
• DOI: http://doi.org/10.5535/arm.2015.39.2.155

Abstract

Aging has become an important topic for scientific research because life expectancy and the number of men and women in older age groups have increased dramatically in the last century. This is true in most countries of the world including the Republic of Korea and the United States. From a rehabilitation perspective, the most important associated issue is a progressive decline in functional capacity and independence. Sarcopenia is partly responsible for this decline. Many changes underlying the loss of muscle mass and force-generating capacity of skeletal muscle can be understood at the cellular and molecular levels. Muscle size and architecture are both altered with advanced adult age. Further, changes in myofibers include impairments in several physiological domains including muscle fiber activation, excitation-contraction coupling, actin-myosin cross-bridge interaction, energy production, and repair and regeneration. A thorough understanding of these alterations can lead to the design of improved preventative and rehabilitative interventions, such as personalized exercise training programs.

Keyword

Elderly; Sarcopenia; Myofilament

MeSH Terms

Adult
Aged
Aging*
Education
Female
Humans
Life Expectancy
Male
Muscle Fibers, Skeletal*
Muscle, Skeletal
Myofibrils
Regeneration
Rehabilitation
Republic of Korea
Sarcopenia
United States

Figure

• 

  Fig. 1 Percentage of old people in South Korea (A) in comparison with other developed countries (B) from 1960 to 2050 (projected). OECD, Organization for Economic Co-operation and Development.

• 

  Fig. 2 Cellular and molecular changes at the level of muscle fibers that contribute to muscle aging.

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