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The effect of strength training volume on satellite cells, myogenic regulatory factors, and growth factors
Østfold University College, Halden, Norway; Norwegian School of Sport Sciences, Oslo, Norway.
Norwegian School of Sport Sciences, Oslo, Norway.
Norwegian School of Sport Sciences, Oslo, Norway.
Lillehammer University College, Lillehammer, Norway.
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2013 (English)In: Scandinavian Journal of Medicine and Science in Sports, ISSN 0905-7188, E-ISSN 1600-0838, Vol. 23, no 6, p. 728-739Article in journal (Refereed) Published
Abstract [en]

The aim of this work was to study the effect of training volume on activation of satellite cells. Healthy untrained men were randomly assigned into two groups. The 3L-1UB group (n = 10) performed three-set leg exercises and single-set upper body exercises, and the 1L-3UB group (n = 11) performed single-set leg exercises and three-set upper body exercises. Both groups performed three sessions (80-90 min) per week for 11 weeks. Biopsies were taken from m. vastus lateralis and m. trapezius. The number of satellite cells, satellite cells positive for myogenin and MyoD, and the number of myonuclei were counted. Homogenized muscle was analyzed for myogenin and MyoD, and extracted ribonucleic acid (RNA) was monitored for selected growth factor transcripts. Knee extensor strength increased more in the 3L-1UB group than in the 1L-3UB group (48 ± 4% vs 29 ± 4%), whereas the strength gain in shoulder press was similar in both training groups. The number of satellite cells in m. vastus lateralis increased more in the 3L-1UB group than in the 1L-3UB group. The number of myonuclei increased similarly in both groups. The messenger RNA expression of growth factors peaked after 2 weeks of training. In conclusion, increasing training volume enhanced satellite cell numbers in the leg muscle, but not in the upper body muscle.

Place, publisher, year, edition, pages
Hoboken, USA: Wiley-Blackwell, 2013. Vol. 23, no 6, p. 728-739
National Category
Basic Medicine Sport and Fitness Sciences
Research subject
Sports Science
Identifiers
URN: urn:nbn:se:oru:diva-24266DOI: 10.1111/j.1600-0838.2012.01452.xISI: 000330192000012PubMedID: 22417199Scopus ID: 2-s2.0-84888135711OAI: oai:DiVA.org:oru-24266DiVA, id: diva2:543068
Available from: 2012-08-06 Created: 2012-08-06 Last updated: 2018-01-12Bibliographically approved

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Kadi, Fawzi

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School of Health and Medical Sciences, Örebro University, Sweden
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