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Skeletal muscle fibres and muscle enzyme activities in monozygous and dizygous twins of both sexes.
Gymnastik- och idrottshögskolan, GIH, Institutionen för idrotts- och hälsovetenskap, Laboratoriet för biomekanik och motorisk kontroll (BMC).
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1977 (Engelska)Ingår i: Acta Physiologica Scandinavica, ISSN 0001-6772, E-ISSN 1365-201X, Vol. 100, nr 4, s. 385-92Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Significance of the genetic component in determining the interindividual variation observed in skeletal muscle fibre composition and enzyme activities was investigated in 31 pairs of male and female monozygous (MZ) and dizygous (DZ) twins, whose ages ranged in all but one pair (11 years) from 15 to 24 years. Percent distribution of slow twitch muscle fibres and activities of Ca2+ and Ng2+ stimulated ATPases, creatine phosphokinase, myokinase, phosphorylase, lactate dehydrogenase (LDH) and distribution of its isozyme LDH-1 were all analyzed in biopsy samples taken from the vastus lateralis muscle. The data disclosed that in contrast to DZ twins the MZ twins of both sexes had an essentially identical muscle fibre composition. Calculation of the heritability estimate for this parameter gave the values of 99.5% and 92.8%, respectively for males and females. In contrast to the fibre composition presence of a significant genetic component was not observed in any of the enzyme activities studied. It was concluded that there is a predominant genetic influence on the skeletal muscle fibre composition in man, and thus also on the potential capacity of the muscles to perform work.

Ort, förlag, år, upplaga, sidor
1977. Vol. 100, nr 4, s. 385-92
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URN: urn:nbn:se:gih:diva-617PubMedID: 199045OAI: oai:DiVA.org:gih-617DiVA, id: diva2:173767
Tillgänglig från: 2009-02-17 Skapad: 2009-02-16 Senast uppdaterad: 2017-12-13Bibliografiskt granskad

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Thorstensson, Alf

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