Journal
SCANDINAVIAN JOURNAL OF MEDICINE & SCIENCE IN SPORTS
Volume 21, Issue 6, Pages 773-782Publisher
WILEY
DOI: 10.1111/j.1600-0838.2010.01178.x
Keywords
neural cell adhesion molecule; satellite cell renewal; hypertrophy; low muscle loading
Categories
Funding
- Danish Medical Research Council
- Lundbeck Foundation
- Novo Nordisk Foundation
- Danish H:S
- Nordea Foundation
- NICHD
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There is strong evidence for enhanced numbers of satellite cells with heavy resistance training. The satellite cell response to very light muscle loading is, however, unknown. We, therefore, designed a 12-week training protocol where volunteers trained one leg with a high load (H) and the other leg with a light load (L). Twelve young healthy men [mean age 25 +/- 3 standard deviation (SD) years] volunteered for the study. Muscle biopsies were collected from the m. vastus lateralis of both legs before and after the training period and satellite cells were visualized by CD56 immunohistochemistry. A significant main effect of time was observed (P < 0.001) for the number of CD56+ cells per fiber (L: from 0.11 +/- 0.02 to 0.13 +/- 0.03; H: from 0.12 +/- 0.03 to 0.15 +/- 0.05, mean +/- SD). The finding that 12 weeks of training skeletal muscle even with very light loads can induce an increase in the number of satellite cells reveals a new aspect of myogenic precursor cell activation and suggests that satellite cells may play a role in skeletal muscle adaptation over a broad physiological range.
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