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Titolo:
THE INFLUENCE OF AGING ON MUSCLE STRENGTH AND MUSCLE-FIBER CHARACTERISTICS WITH SPECIAL REFERENCE TO ECCENTRIC STRENGTH
Autore:
HORTOBAGYI T; ZHENG DH; WEIDNER M; LAMBERT NJ; WESTBROOK S; HOUMARD JA;
Indirizzi:
E CAROLINA UNIV,SCH HLTH & HUMAN PERFORMANCE,BIOMECH LAB,251 SPORTS MED BLDG GREENVILLE NC 27858 E CAROLINA UNIV,SCH HLTH & HUMAN PERFORMANCE,HUMAN PERFORMANCE LAB GREENVILLE NC 27858 E CAROLINA UNIV,DEPT PHYS THERAPY GREENVILLE NC 27858
Titolo Testata:
The journals of gerontology. Series A, Biological sciences and medical sciences
fascicolo: 6, volume: 50, anno: 1995,
pagine: 399 - 406
SICI:
1079-5006(1995)50:6<399:TIOAOM>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
SKELETAL-MUSCLE; OLDER MEN; KNEE; EXTENSION; YOUNG; FLEXION; WOMEN; AGE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Science Citation Index Expanded
Citazioni:
31
Recensione:
Indirizzi per estratti:
Citazione:
T. Hortobagyi et al., "THE INFLUENCE OF AGING ON MUSCLE STRENGTH AND MUSCLE-FIBER CHARACTERISTICS WITH SPECIAL REFERENCE TO ECCENTRIC STRENGTH", The journals of gerontology. Series A, Biological sciences and medical sciences, 50(6), 1995, pp. 399-406

Abstract

It is well established that aging seriously reduces isometric and concentric muscle strength due to atrophy, deterioration of mechanical properties, and motor unit loss. However, there is limited information on the impact of aging on eccentric strength despite the fact that suchforces play an equally important role during daily activities. The purpose of this study was to examine the influence of aging on three expressions of muscle strength (isometric, concentric, and eccentric) in relation to muscle fiber characteristics, with special emphasis on eccentric force. Sedentary but healthy men (age range 18-80 years, a = 60) and women (20-74 years, a = 30) were tested for maximal effort isometric, concentric, and eccentric (1.05, 2.09, 3.14 rads . s(-1)) quadriceps strength, body Composition, and muscle fiber characteristics of the vastus lateralis (men only). There was a significant (p<.05) similar to 30 N per decade decline in isometric and concentric forces, but only 9 N per decade reduction in eccentric strength. There was a significant reduction in Type II muscle fiber area with aging (p<.05). Isometric, eccentric, and concentric force correlated r = .33, r = .32 (p<.05), and r = .12 (p>.05) with Type II muscle fiber area, respectively. The correlation between age and fat-free mass/force ratio ranged fromr = .39 to .43 in men and r = .27 to .50 in women. The data suggest arelative preservation of eccentric strength with aging in men and women that seems to bk independent of muscle mass or muscle fiber type orsize.

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Documento generato il 03/12/20 alle ore 11:40:04