Document Detail


Acute and prolonged reduction in joint stiffness in humans after exhausting stretch-shortening cycle exercise.
MedLine Citation:
PMID:  12436277     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The purpose of the present study was to examine the acute and long-term fatigue effects of exhausting stretch-shortening cycle (SSC) exercise on the stiffness of ankle and knee joints. Five subjects were fatigued on a sledge apparatus by 100 maximal rebound jumps followed by continuous submaximal jumping until complete exhaustion. Neuromuscular fatigue effects were examined in submaximal hopping (HOP) and in maximal drop jumps (DJ) from 35 (DJ35) and 55 cm (DJ55) heights on a force plate. Additional force and reflex measurements were made using an ankle ergometer. Jumping tests and ankle ergometer tests were carried out before, immediately after, 2 h (2H), 2 days and 7 days (7D) after the SSC exercise. Kinematics, force and electromyography (EMG) recordings were complemented with inverse dynamics, which was used to calculate joint moments. The quotient of changes in joint moment divided by changes in joint angle was used as a value of joint stiffness (JS). In addition, blood lactate concentrations and serum creatine kinase activities were determined. The exercise induced a clear decrease in knee joint stiffness by [mean (SD)] 29 (13)% (P < 0.05) in HOP, 31 (6)% (P < 0.05) in DJ35 and 34 (14)% (P < 0.05) in DJ55. A similar trend was observed in the ankle joint stiffness with significant post-exercise reductions of 22 (8)% (P < 0.05) in DJ35 and of 27 (19)% (P < 0.05) at 2H in DJ55. The subsequent recovery of JS was slow and in some cases incomplete still at 7D. Generally, all the EMG parameters were fully recovered by 2H, whereas the force recovery was still incomplete at this time. These data indicate that the immediate reduction in JS was probably related to the effects of both central (neural) and peripheral (metabolic) fatigue, whereas the prolonged impairment was probably due to peripheral fatigue (muscle damage).
Authors:
S Kuitunen; J Avela; H Kyröläinen; C Nicol; P V Komi
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2002-08-14
Journal Detail:
Title:  European journal of applied physiology     Volume:  88     ISSN:  1439-6319     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2002 Nov 
Date Detail:
Created Date:  2002-11-18     Completed Date:  2003-06-13     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  107-16     Citation Subset:  IM    
Affiliation:
Neuromuscular Research Centre, Department of Biology of Physical Activity, PO Box 35, 40014 University of Jyväskylä, Finland. kuitunen@maila.jyu.fi
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MeSH Terms
Descriptor/Qualifier:
Adult
Ankle Joint / physiopathology*
Bicycling / physiology*
Biomechanics
Creatine Kinase / blood
Elasticity
Electromyography
Humans
Knee Joint / physiopathology*
Lactic Acid / blood
Muscle Fatigue / physiology
Physical Endurance*
Recovery of Function
Time Factors
Chemical
Reg. No./Substance:
50-21-5/Lactic Acid; EC 2.7.3.2/Creatine Kinase

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


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