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Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111
Online ISSN 1827-1928
Prou E. 1, 2, Guevel A. 1, Benezet P. 2, Marini J. F. 1
1 Faculté des Science du Sport, Université de Nice Sophia Antipolis (UNSA), Nice, France;
2 Centre de Réadaptation Fonctionnelle de Valmante, Marseille, France
Backgrond. Unaccustomed eccentric exercise induces muscle damage. A single session of eccentric exercise can induce an “adaptive effect” protecting exercised muscles during several weeks. Our aim was to verify this phenomenon in isokinetic exercise. Tested hypothesis was: the progressive muscle rise in tension due to isokinetic eccentric actions would be insufficient to induce the adaptive effect.
Methods. Experimental design: prospective study. Setting: general community. Participants: six healthy and moderately active (untrained) males (29.1 yr±1.5 SEM). Interventions: subjects performed two isokinetic eccentric exercises (EE1 and EE2) of the quadriceps femoris of both legs (120°.s-1; 8 sets of 15 repetitions) separated by 4 weeks. Measures: type I serum myosin heavy chains (MHC) and creatine kinase concentrations (CK), and rate of perceived soreness (DOMS) were collected before each exercise and on days 1, 2, 4, 6 and 9.
Results. Both exercises induced significant (p<0.01) increases in MHC and CK concentrations, and DOMS score. There was no significant difference between EE1 and EE2, at any measurement time for any parameter. Mean peak values (SEM) were respectively (EE1; EE2): MHC (µU.l-1): 308 (192); 285 (191). CK (U.l-1): 1217 (760); 1297 (1039). DOMS score: 2.67 (0.52); 2.33 (0.52).
Conclusions. The first session of eccentric isokinetic exercise (EE1) had no adaptive effect against muscle damage when an identical session was performed 4 weeks later (EE2). Muscle adaptation could have resulted in increased work production (+10.2%; p<0.05; from EE1 to EE2).