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Single muscle fibre contractile properties differ between body builders, power athletes, and control subjects

Meijer, J.P. and Jaspers, R.T. and Rittweger, J. and Seynnes, O. and Kamandulis, S. and Brazaitis, M. and Skuvydas, A. and Pisot, R. and Simunic, B. and Narici, M. and Degens, H. (2015) Single muscle fibre contractile properties differ between body builders, power athletes, and control subjects. Experimental Physiology, 100 (11), pp. 1331-1341. Wiley. DOI: 10.1113/EP085267 ISSN 0958-0670

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Abstract

What is the central question of this study? Do the contractile properties of single muscle fibres differ between body-builders, power athletes and control subjects? What is the main finding and its importance? Peak power normalized for muscle fibre volume in power athletes is higher than in control subjects. Compared with control subjects, maximal isometric tension (normalized for muscle fibre cross-sectional area) is lower in body-builders. Although this difference may be caused in part by an apparent negative effect of hypertrophy, these results indicate that the training history of power athletes may increase muscle fibre quality, whereas body-building may be detrimental. We compared muscle fibre contractile properties of biopsies taken from the vastus lateralis of 12 body-builders (BBs; low- to moderate-intensity high-volume resistance training), six power athletes (PAs; high-intensity, low-volume combined with aerobic training) and 14 control subjects (Cs). Maximal isotonic contractions were performed in single muscle fibres, typed with SDS-PAGE. Fibre cross-sectional area was 67 and 88% (P < 0.01) larger in BBs than in PAs and Cs, respectively, with no significant difference in fibre cross-sectional area between PAs and Cs. Fibres of BBs and PAs developed a higher maximal isometric tension (32 and 50%, respectively, P < 0.01) than those of Cs. The specific tension of BB fibres was 62 and 41% lower than that of PA and C fibres (P < 0.05), respectively. Irrespective of fibre type, the peak power (PP) of PA fibres was 58% higher than that of BB fibres (P < 0.05), whereas BB fibres, despite considerable hypertrophy, had similar PP to the C fibres. This work suggests that high-intensity, low-volume resistance training with aerobic exercise improves PP, while low- to moderate-intensity high-volume resistance training does not affect PP and results in a reduction in specific tension. We postulate that the decrease in specific tension is caused by differences in myofibrillar density and/or post-translational modifications of contractile proteins.

Item URL in elib:https://elib.dlr.de/100845/
Document Type:Article
Title:Single muscle fibre contractile properties differ between body builders, power athletes, and control subjects
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Meijer, J.P.School of Healthcare Science, Manchester Metropolitan University, Manchester, UKUNSPECIFIED
Jaspers, R.T.Laboratory for Myology, MOVE Research Institute Amsterdam, Faculty of Human Movement Sciences, VU University AmsterdamUNSPECIFIED
Rittweger, J.Institute of Aerospace Medicine, Deutsches Zentrum für Luft- und Raumfahrt, DLR e.V., Cologne, Germany and Medical Faculty, University of Cologne, Cologne, Germany; joern.rittweger (at) dlr.deUNSPECIFIED
Seynnes, O.Manchester Metropoliaton UniversityUNSPECIFIED
Kamandulis, S.Sports Science and Innovation Institute, Lithuanian Sports University, Kaunas, LithuaniaUNSPECIFIED
Brazaitis, M.Sports Science and Innovation Institute, Lithuanian Sports University, Kaunas, LithuaniaUNSPECIFIED
Skuvydas, A.Sports Science and Innovation Institute, Lithuanian Sports University, Kaunas, LithuaniaUNSPECIFIED
Pisot, R.University of PrimorskaUNSPECIFIED
Simunic, B.University of PrimorskaUNSPECIFIED
Narici, M.Manchester Metropolitan University, U.K.UNSPECIFIED
Degens, H.School of Healthcare Science, Manchester Metropolitan University, Manchester, UKUNSPECIFIED
Date:1 November 2015
Journal or Publication Title:Experimental Physiology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:100
DOI :10.1113/EP085267
Page Range:pp. 1331-1341
Publisher:Wiley
ISSN:0958-0670
Status:Published
Keywords:Single muscle; fibre; body-builders; power athletes
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Integrative Studien (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Space Physiology
Deposited By: Becker, Christine
Deposited On:11 Jan 2017 09:57
Last Modified:06 Sep 2019 15:25

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