Document Detail


The influence of familiarization sessions on the stability of ramp and ballistic isometric torque in older adults.
MedLine Citation:
PMID:  20956841     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Ramp isometric contractions determine peak torque (PT) and neuromuscular activation (NA), and ballistic contractions can be used to evaluate rate of torque development (RTD) and electrical mechanical delay (EMD). The purposes of this study were to assess the number of sessions required to stabilize ramp and ballistic PT and to compare PT and NA between contractions in older adults. Thirty-five older men and women (age 63.7 ± 3.7 yr, body mass 64.3 ± 10.7 kg, height 159.2 ± 6.6 cm) performed 4 sessions of unilateral ramp and ballistic isometric knee extension, 48 hr apart. PT significantly increased (main time effect p < .05) from the first to the third session, with no further improvements thereafter. There was a trend toward higher PT in ballistic than in ramp contractions. No difference between contraction types on EMG values was observed. Therefore, the authors suggest that 3 familiarization sessions be performed to correctly assess PT. In addition, PT, NA, RTD, and EMD can be assessed with ballistic contraction in older adults.
Authors:
Lilian F Wallerstein; Renato Barroso; Valmor Tricoli; Marco T Mello; Carlos Ugrinowitsch
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of aging and physical activity     Volume:  18     ISSN:  1063-8652     ISO Abbreviation:  J Aging Phys Act     Publication Date:  2010 Oct 
Date Detail:
Created Date:  2010-10-19     Completed Date:  2010-12-10     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9415639     Medline TA:  J Aging Phys Act     Country:  United States    
Other Details:
Languages:  eng     Pagination:  390-400     Citation Subset:  IM    
Affiliation:
School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil.
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MeSH Terms
Descriptor/Qualifier:
Aged
Biomechanics
Electromyography / methods*
Exercise Test / methods*
Female
Geriatric Assessment
Humans
Isometric Contraction
Knee Joint
Male
Middle Aged
Muscle Strength*
Practice (Psychology)*
Reproducibility of Results
Torque

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


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