Abstract
Background
Skeletal muscle is very sensitive to extracellular and intracellular signaling evoked by contractions from endurance and resistance exercise. The aim of this study was to compare the effects of moderate- and high-intensity endurance and resistance training on the serum myostatin (MSTN) and insulin-like growth factor (IGF-1) levels in older rats.
Materials and methods
Fifty old Wistar male rats (23 months old) were randomly divided into four experimental and one control groups, including moderate-endurance training (MET) (n = 10), high-intensity endurance training (EHT) (n = 10), moderate-intensity resistance training (MRT) (n = 10), high-intensity resistance training (HRT) (n = 10), and control group (C) (n = 10). Seventy-two hours after the last exercise session, euthanasia of the rats were rendered unconscious and direct blood samples were collected. Serum IGF-1 and MSTN concentration were measured using the enzyme-linked immuno sorbent assay (ELISA) method. The statistical analysis was performed using one-way analysis of variance (ANOVA) test with a significance level of p ≤ 0.05.
Results
There was a significant reduction in MSTN and an increase in IGF-1 concentrations was observed between IGF-I levels in high and moderate resistance and endurance training. However, no significant difference was observed in MSTN levels between groups.
Discussion
Therefore, it appears that resistance training, especially HRT, is effective to increase growth mediators among older rats.
Author Statement
Research funding: Authors state no funding involved.
Conflict of interest: None declared.
Informed consent: Not applicable.
Ethical approval: The research protocol was approved by the Animal Ethics Committee of Shahrekord University. All procedures were conducted in accordance with the Guide for care and use of laboratory animals.
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Article note
This article is extracted from the doctoral thesis of Zohreh Shanazari.
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