Document Detail


Torque, myoeletric sygnal and heart rate responses during concentric and eccentric exercises in older men.
MedLine Citation:
PMID:  21390469     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: The literature reports that the eccentric muscular action produces greater force and lower myoelectric activity than the concentric muscular action, while the heart rate (HR) responses are bigger during concentric contraction.
OBJECTIVES: To investigate the maximum average torque (MAT), surface electromyographic (SEMG) and the heart rate (HR) responses during different types of muscular contraction and angular velocities in older men.
METHODS: Twelve healthy men (61.7±1.6 years) performed concentric (C) and eccentric (E) isokinetic knee extension-flexion at 60º/s and 120º/s. SEMG activity was recorded from vastus lateralis muscle and normalized by Root Mean Square - RMS (µV) of maximal isometric knee extension at 60º. HR (beats/min) and was recorded at rest and throughout each contraction. The data were analyzed by the Friedman test for repeated measures with post hoc Dunn's test (p<0.05).
RESULTS: The median values of MAT (N.m/kg) was smaller and the RMS (µV) was larger during concentric contraction (C60º/s=2.80 and 0.99; C120º/s=2.46 and 1.0) than eccentric (E60º/s=3.94 and 0.85; E120º/s=4.08 and 0.89), respectively. The HR variation was similar in the four conditions studied.
CONCLUSION: The magnitude of MAT and RMS responses in older men were dependent of the nature of the muscular action and independent of the angular velocity, whereas HR response was not influenced by these factors.
Authors:
Robison J Quitério; Ruth C Melo; Anielle C M Takahashi; Isabela A V Aniceto; Ester Silva; Aparecida M Catai
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Publication Detail:
Type:  Journal Article     Date:  2011-03-04
Journal Detail:
Title:  Revista brasileira de fisioterapia (São Carlos (São Paulo, Brazil))     Volume:  15     ISSN:  -     ISO Abbreviation:  Rev Bras Fisioter     Publication Date:    2011 Jan-Feb
Date Detail:
Created Date:  2011-04-26     Completed Date:  2011-09-29     Revised Date:  2013-08-21    
Medline Journal Info:
Nlm Unique ID:  101186153     Medline TA:  Rev Bras Fisioter     Country:  Brazil    
Other Details:
Languages:  eng     Pagination:  8-14     Citation Subset:  IM    
Affiliation:
Physical Therapy Department, Universidade Federal de São Carlos, São Carlos, SP, Brazil.
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MeSH Terms
Descriptor/Qualifier:
Biomechanics
Electromyography
Exercise / physiology*
Heart Rate / physiology*
Humans
Male
Middle Aged
Torque

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