Document Detail


Strength training alters contractile properties of the triceps brachii in men aged 65-78 years.
MedLine Citation:
PMID:  8477684     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Voluntary and electrically evoked contractile properties were studied in the triceps brachii following a 24-week dynamic strength training program in ten men aged 65-78 years. Eight men of a similar age were control subjects. A resistance overload program was undertaken three times per week with subjects performing four sets of six to eight repetitions at 80% of their one repetition on maximum (1RM). Maximum voluntary contraction (MVC) and contractile properties were measured at 0, 12, and 24 weeks in the exercise group and at 0 and 24 weeks in the controls. The 1RM was used to assess dynamic strength at 0 and 24 weeks in the exercise group. Contractile measures consisted of supramaximal isometric twitch and post-activation twitch parameters. Muscle size was estimated from anthropometric measurements. Compared with the control group, the exercise group MVC increased by about 20% and time to peak tension was slowed by about 11%. Also in the exercise group the peak rate of torque development of the potentiated twitch was reduced by about 10%. Twitch potentiation was substantial in both groups (about 140%) and unaffected by training. The 1 RM increased by about 30%, and there was a non-significant positive change of 8.6% in the muscle plus bone cross-sectional area in the exercise group. The results show that the force generating capacity of the triceps brachii in these men can be significantly improved for up to 24 weeks using concentric overload training. Furthermore, the finding of slowed twitch properties and no change in peak twitch amplitude substantiate and extend the limited data currently available on intrinsic contractile changes in the elderly.(ABSTRACT TRUNCATED AT 250 WORDS)
Authors:
C L Rice; D A Cunningham; D H Paterson; J R Dickinson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  European journal of applied physiology and occupational physiology     Volume:  66     ISSN:  0301-5548     ISO Abbreviation:  Eur J Appl Physiol Occup Physiol     Publication Date:  1993  
Date Detail:
Created Date:  1993-05-27     Completed Date:  1993-05-27     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0410266     Medline TA:  Eur J Appl Physiol Occup Physiol     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  275-80     Citation Subset:  IM    
Affiliation:
Centre for Activity and Ageing, University of Western Ontario, London, Canada.
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MeSH Terms
Descriptor/Qualifier:
Aged
Body Height / physiology
Body Weight / physiology
Electric Stimulation
Humans
Isometric Contraction / physiology
Male
Muscle Contraction / physiology
Muscles / physiology*
Physical Education and Training*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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