Preservation of eccentric strength in older adults: evidence, mechanisms and implications for training and rehabilitation.

2.50
Hdl Handle:
http://hdl.handle.net/2173/109466
Title:
Preservation of eccentric strength in older adults: evidence, mechanisms and implications for training and rehabilitation.
Authors:
Roig, Marc; Macintyre, Donna L.; Eng, Janice J; Narici, Marco V.; Maganaris, Constantinos N.; Reid, W. Darlene
Citation:
Experimental gerontology, 2010, vol. 45, no. 6, pp. 400-9
Publisher:
Elsevier
Issue Date:
Jun-2010
URI:
http://hdl.handle.net/2173/109466
DOI:
10.1016/j.exger.2010.03.008
PubMed ID:
20303404
Additional Links:
http://www.elsevier.com/locate/expgero
Abstract:
Overall reductions in muscle strength typically accompany the aging process. However, older adults show a relatively preserved capacity of producing eccentric strength. The preservation of eccentric strength in older adults is a well-established phenomenon, occurring indiscriminately across different muscle groups, independent of age-related architectural changes in muscle structure and velocity of movement. The mechanisms for the preservation of eccentric strength appear to be mechanical and cellular in origin and include both passive and active elements regulating muscle stiffness. The age-related accumulation of non-contractile material in the muscle-tendon unit increases passive stiffness, which might offer mechanical advantage during eccentric contractions. In addition, the preserved muscle tension and increased instantaneous stiffness of old muscle fibers during stretch increase active stiffness, which might enhance eccentric strength. The fact that the preservation of eccentric strength is present in people with chronic conditions when compared to age-matched healthy controls indicates that the aging process per se does not exclusively mediate the preservation of eccentric strength. Physical inactivity, which is common in elderly and people with chronic conditions, is a potential factor regulating the preservation of eccentric strength. When compared to concentric strength, the magnitude of preservation of eccentric strength in older adults ranges from 2% to 48% with a mean value of 21.6% from all studies. This functional reserve of eccentric strength might be clinically relevant, especially to initiate resistance training and rehabilitation programs in individuals with low levels of strength.
Type:
Article
Language:
en
Description:
Full-text of this article is not available in this e-prints service. This article was originally published following peer-review in Experimental Gerontology, published by and copyright Elsevier.
Keywords:
Aging; Skeletal muscle; Sarcopenia; Eccentric contraction; Strength
MeSH:
Aged; Aged, 80 and over; Aging; Female; Humans; Male; Muscle Contraction; Muscle Fibers, Skeletal; Muscle Strength; Sarcopenia
ISSN:
1873-6815; 0531-5565

Full metadata record

DC FieldValue Language
dc.contributor.authorRoig, Marcen
dc.contributor.authorMacintyre, Donna L.en
dc.contributor.authorEng, Janice Jen
dc.contributor.authorNarici, Marco V.en
dc.contributor.authorMaganaris, Constantinos N.en
dc.contributor.authorReid, W. Darleneen
dc.date.accessioned2010-08-11T15:00:23Z-
dc.date.available2010-08-11T15:00:23Z-
dc.date.issued2010-06-
dc.identifier.citationExperimental gerontology, 2010, vol. 45, no. 6, pp. 400-9en
dc.identifier.issn1873-6815-
dc.identifier.issn0531-5565-
dc.identifier.pmid20303404-
dc.identifier.doi10.1016/j.exger.2010.03.008-
dc.identifier.urihttp://hdl.handle.net/2173/109466-
dc.descriptionFull-text of this article is not available in this e-prints service. This article was originally published following peer-review in Experimental Gerontology, published by and copyright Elsevier.en
dc.description.abstractOverall reductions in muscle strength typically accompany the aging process. However, older adults show a relatively preserved capacity of producing eccentric strength. The preservation of eccentric strength in older adults is a well-established phenomenon, occurring indiscriminately across different muscle groups, independent of age-related architectural changes in muscle structure and velocity of movement. The mechanisms for the preservation of eccentric strength appear to be mechanical and cellular in origin and include both passive and active elements regulating muscle stiffness. The age-related accumulation of non-contractile material in the muscle-tendon unit increases passive stiffness, which might offer mechanical advantage during eccentric contractions. In addition, the preserved muscle tension and increased instantaneous stiffness of old muscle fibers during stretch increase active stiffness, which might enhance eccentric strength. The fact that the preservation of eccentric strength is present in people with chronic conditions when compared to age-matched healthy controls indicates that the aging process per se does not exclusively mediate the preservation of eccentric strength. Physical inactivity, which is common in elderly and people with chronic conditions, is a potential factor regulating the preservation of eccentric strength. When compared to concentric strength, the magnitude of preservation of eccentric strength in older adults ranges from 2% to 48% with a mean value of 21.6% from all studies. This functional reserve of eccentric strength might be clinically relevant, especially to initiate resistance training and rehabilitation programs in individuals with low levels of strength.en
dc.language.isoenen
dc.publisherElsevieren
dc.relation.urlhttp://www.elsevier.com/locate/expgeroen
dc.subjectAgingen
dc.subjectSkeletal muscleen
dc.subjectSarcopeniaen
dc.subjectEccentric contractionen
dc.subjectStrengthen
dc.subject.meshAged-
dc.subject.meshAged, 80 and over-
dc.subject.meshAging-
dc.subject.meshFemale-
dc.subject.meshHumans-
dc.subject.meshMale-
dc.subject.meshMuscle Contraction-
dc.subject.meshMuscle Fibers, Skeletal-
dc.subject.meshMuscle Strength-
dc.subject.meshSarcopenia-
dc.titlePreservation of eccentric strength in older adults: evidence, mechanisms and implications for training and rehabilitation.en
dc.typeArticleen

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