NDLI: Concomitant increases in myonuclear and satellite cell content in female trapezius muscle following strength training

Content Provider	Springer Nature Link
Author	Kadi, F. Thornell, Lars Eric
Copyright Year	2000
Abstract	A skeletal muscle fibre maintains its cytoplasmic volume by means of hundreds of myonuclei distributed along its entire length. Therefore it is hypothesised that changes in fibre size would involve modifications in myonuclear number. In this study, we have examined whether 10 weeks of strength training can induce changes in the number of myonuclei and satellite cells in female trapezius muscles. Biopsies were taken pre- and posttraining from the upper part of the descending trapezius muscle of nine subjects. Muscle samples were analysed for fibre area and myonuclear and satellite cell number using immunohistochemistry. There was a 36% increase in the cross-sectional area of muscle fibres. The hypertrophy of muscle fibres was accompanied by an approximately 70% increase in myonuclear number and a 46% increase in the number of satellite cells. Myonuclei number was positively correlated to satellite cell number indicating that a muscle with an increased concentration of myonuclei will contain a correspondingly higher number of satellite cells. The acquisition of additional myonuclei appears to be required to support the enlargement of multinucleated muscle cells following 10 weeks of strength training. Increased satellite cell content suggests that mitotic divisions of satellite cells produced daughter cells that became satellite cells.
Starting Page	99
Ending Page	103
Page Count	5
File Format	PDF
ISSN	09486143
Journal	Histochemistry and Cell Biology
Volume Number	113
Issue Number	2
e-ISSN	1432119X
Language	English
Publisher	Springer-Verlag
Publisher Date	2000-02-23
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Cell Biology Histology Molecular Biology Medical Laboratory Technology

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