The Effect of Detraining After a Period of Resistance Training on Corticospinal Excitability Pathway of Arm Muscles
SOREN Student Sports & Health Open Researches e-Journal: New-Approaches,
Vol. 2 No. 3 (1400),
21 December 2021
,
Page 37-45
https://doi.org/10.22037/soren.v2i3.36984
Abstract
Background and aim: Due to the role of neural adaptations in strength changes following detraining, this study aimed to determine the adaptations of corticospinal excitatory pathways in agonist and antagonist arm muscles after 4 weeks of detraining, after a period of resistance training using TMS variables.
Methods: 12 healthy untrained individuals (training group (N=10) and pilot group (N=2)) with a mean age of 28.00 ± 2.04 years and a weight of 70.91±8.52 kg voluntarily participated in this study. At week 0 (pre-test), week 4 of training, week 2 of detraining, and week 4 of detraining, arm circumference (AURC), 1- RM, Co-activation, and corticospinal excitability (MEP) were measured.
Results: The results of the present study showed that strength in agonist's muscle had a significant reduction (10%) after 4 weeks of detraining. The antagonist muscle, similar to the agonist's muscle, responded to detraining (2.5% in week 2 and 8% in week 4 of detraining). Also, 4 weeks of detraining was associated with a decrease in MEP in both muscles (p =0.003). The results of linear regression showed that strength changes were not related to excitability in both muscles.
Conclusion: The results of this study showed that corticospinal responses to detraining in the upper body are not limited to trained muscles and detraining reduces corticospinal excitatory pathway, but no difference was observed between agonist and antagonist muscles in this period.
- Agonist
- Antagonist
- Detraining
- Neural Adaptations
- Voluntary Strength
- Co-activation
How to Cite
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