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Contractile Propert...
Contractile Properties of MHC I and II Fibers From Highly Trained Arm and Leg Muscles of Cross-Country Skiers
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- Gejl, Kasper D. (författare)
- Department of Sports Science and Clinical Biomechanics, Faculty of Health Sciences, University of Southern Denmark, Denmark,Univ Southern Denmark, Dept Sports Sci & Clin Biomech, Odense, Denmark.
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- Hvid, Lars G. (författare)
- Section for Sports Science, Department of Public Health, Faculty of Health, Aarhus University, Denmark,Aarhus Univ, Dept Publ Hlth Exercise Biol, Aarhus, Denmark.
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- Andersson, Erik, 1984- (författare)
- Mittuniversitetet,Institutionen för hälsovetenskap,Swedish Winter Sports Research Centre, Mid Sweden University, Sweden; School of Sport Sciences, Faculty of Health Sciences, UiT the Arctic University of Norway, Norway
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- Jensen, Rasmus (författare)
- Department of Sports Science and Clinical Biomechanics, Faculty of Health Sciences, University of Southern Denmark, Denmark,Univ Southern Denmark, Dept Sports Sci & Clin Biomech, Odense, Denmark.
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- Holmberg, Hans-Christer, 1958- (författare)
- Karolinska Institutet,Mittuniversitetet,Luleå tekniska universitet,Hälsa, medicin och rehabilitering,Swedish Winter Sports Research Centre, Mid Sweden University, Sweden; Department of Physiology and Pharmacology, Karolinska Institutet, Sweden,Institutionen för hälsovetenskap,Luleå Univ Technol, Dept Hlth Sci, Luleå, Sweden.;Karolinska Inst, Dept Physiol & Pharmacol, Stockholm, Sweden.
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- Ørtenblad, Niels (författare)
- Department of Sports Science and Clinical Biomechanics, Faculty of Health Sciences, University of Southern Denmark, Denmark,Univ Southern Denmark, Dept Sports Sci & Clin Biomech, Odense, Denmark.
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Department of Sports Science and Clinical Biomechanics, Faculty of Health Sciences, University of Southern Denmark, Denmark Univ Southern Denmark, Dept Sports Sci & Clin Biomech, Odense, Denmark (creator_code:org_t)
- 2021-06-16
- 2021
- Engelska.
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Ingår i: Frontiers in Physiology. - : Frontiers Media S.A.. - 1664-042X. ; 12
- Relaterad länk:
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https://doi.org/10.3...
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https://www.frontier...
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https://miun.diva-po... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.3...
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https://urn.kb.se/re...
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http://kipublication...
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Abstract
Ämnesord
Stäng
- Little is known about potential differences in contractile properties of muscle fibers of the same type in arms and legs. Accordingly, the present study was designed to compare the force-generating capacity and Ca2+ sensitivity of fibers from arm and leg muscles of highly trained cross-country skiers. Method: Single muscle fibers of m. vastus lateralis and m. triceps brachii of 8 highly trained cross-country skiers were analyzed with respect to maximal Ca2+-activated force, specific force and Ca2+ sensitivity. Result: The maximal Ca2+-activated force was greater for MHC II than MHC I fibers in both the arm (+62 %, P < 0.001) and leg muscle (+77 %, P < 0.001), with no differences between limbs for each MHC isoform. In addition, the specific force of MHC II fibers was higher than that of MHC I fibers in both arms (+41 %, P = 0.002) and legs (+95 %, P < 0.001). The specific force of MHC II fibers was the same in both limbs, whereas MHC I fibers from the m. triceps brachii were, on average, 39% stronger than fibers of the same type from the m. vastus lateralis (P = 0.003). pCa50 was not different between MHC I and II fibers in neither arms nor legs, but the MHC I fibers of m. triceps brachii demonstrated higher Ca2+ sensitivity than fibers of the same type from m. vastus lateralis (P = 0.007). Conclusion: Comparison of muscles in limbs equally well trained revealed that MHC I fibers in the arm muscle exhibited a higher specific force-generating capacity and greater Ca2+ sensitivity than the same type of fiber in the leg, with no such difference in the case of MHC II fibers. These distinct differences in the properties of fibers of the same type in equally well-trained muscles open new perspectives in muscle physiology.
Ämnesord
- MEDICIN OCH HÄLSOVETENSKAP -- Hälsovetenskap -- Idrottsvetenskap (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Health Sciences -- Sport and Fitness Sciences (hsv//eng)
Nyckelord
- myofiber
- Force-generating capacity
- cross-country skiing
- Myosin heavy chain isoform
- Athletes
- Exercise
- Triceps Brachii
- Vastus lateralis
- Physiotherapy
- Fysioterapi
- Centre - Swedish Sports Technology and Performance Research Centre (SPORTC)
- Centrumbildning - Swedish Sports Technology and Performance Research Centre (SPORTC)
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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