Abstract
Purpose
Resistance training (RT) induces muscle growth at varying rates across RT phases, and evidence suggests that the muscle-molecular responses to training bouts become refined or attenuated in the trained state. This study examined how proteolysis-related biomarkers and extracellular matrix (ECM) remodeling factors respond to a bout of RT in the untrained (UT) and trained (T) state.
Methods
Participants (19 women and 19 men) underwent 10 weeks of RT. Biopsies of vastus lateralis were collected before and after (24 h) the first (UT) and last (T) sessions. Vastus lateralis cross-sectional area (CSA) was assessed before and after the experimental period.
Results
There were increases in muscle and type II fiber CSAs. In both the UT and T states, calpain activity was upregulated and calpain-1/-2 protein expression was downregulated from Pre to 24 h. Calpain-2 was higher in the T state. Proteasome activity and 20S proteasome protein expression were upregulated from Pre to 24 h in both the UT and T. However, proteasome activity levels were lower in the T state. The expression of poly-ubiquitinated proteins was unchanged. MMP activity was downregulated, and MMP-9 protein expression was elevated from Pre to 24 h in UT and T. Although MMP-14 protein expression was acutely unchanged, this marker was lower in T state. TIMP-1 protein levels were reduced Pre to 24 h in UT and T, while TIMP-2 protein levels were unchanged.
Conclusion
Our results are the first to show that RT does not attenuate the acute-induced response of proteolysis and ECM remodeling-related biomarkers.
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Data availability
Source data are available from the corresponding authors upon reasonable request.
Abbreviations
- ANCOVA:
-
Analysis of covariance
- AU:
-
Arbitray units
- BCA:
-
Bicinchoninic acid
- BSA:
-
Bovine serum albumin
- CI:
-
Confidence interval
- CSA:
-
Cross-sectional area
- ECM:
-
Extracellular matrix
- ES:
-
Effect size
- fCSA:
-
Fiber cross-sectional area
- FOXO1:
-
Forkhead box O1 protein
- FOXO3:
-
Forkhead box O3 protein
- mCSA:
-
Muscle cross-sectional area
- MMP:
-
Matrix metalloproteinase
- MuRF-1:
-
Muscle ring finger protein-1
- OCT:
-
Optimal cutting temperature
- PBS:
-
Phosphate-buffered saline
- RFU:
-
Relative fluorescence unit
- RLU:
-
Relative luminescence unit
- RM:
-
Repetition maximum
- RT:
-
Resistance training
- SD:
-
Standard deviation
- T:
-
Trained
- TBST:
-
Tris-buffered saline with 0.1% Tween-20
- TIMP:
-
Tissue inhibitor of metalloproteinase
- UPP:
-
Ubiquitin–proteasome pathway
- US:
-
Ultrasound
- UT:
-
Untrained
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Acknowledgements
We greatly acknowledge all participants of this study. We also appreciate the technical assistance of the staff of the Nutrabolt Applied and Molecular Laboratory at Auburn University and the assistance of Dr. Felipe Cassaro Vechin in muscle biopsy procedures.
Funding
This work was supported by the Coordination for the Improvement of Higher Education Personnel (CAPES) (#88887.634296/2021–00 and #88887.717127/2022–00 to M.C.S.; #88887.717126/2022–00 to J.G.B.; 88,887.634297/2021–00 to T.S.C.), by the National Council for Scientific and Technological Development (CNPq) (#311387/2021–7 to C.A.L.; #425917/2018–5 to C.U.; #140753/2020–6 to J.G.B.) and by discretionary laboratory funds of C.A.L. and M.D.R.
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M.C.S., C.U., M.D.R., and C.A.L. conceived and designed this research. M.C.S, J.G.B., and T.S.C recruited participants and coordinated training sessions and data collection. D.G.S, D.F.B., J.G.B, N.F.D., P.C.C.F., R.M.J., T.S.C., V.A. and L.A.R.C. performed training sessions and data collection. M.C.S., J.G.B., J.S.G., and P.H.C.M. conducted laboratory assays and experiments. M.C.S., C.A.L., and M.D.R. analyzed and interpreted the data. M.C.S. primarily drafted the manuscript, and C.A.L. and M.D.R. edited it. All authors revised the manuscript and provided intellectual contributions. All authors approved the final version of the manuscript. All authors qualify for authorship, and all those who qualify are listed.
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The authors have no perceived or potential conflicts of interest to declare, financial or otherwise.
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This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the Ethics Committee of the Federal University of São Carlos (no. 56259622.0.0000.5504).
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Informed consent was obtained from all individual participants included in the study.
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Communicated by Mark Elisabeth Willems.
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Scarpelli, M.C., Bergamasco, J.G.A., Godwin, J.S. et al. Resistance training-induced changes in muscle proteolysis and extracellular matrix remodeling biomarkers in the untrained and trained states. Eur J Appl Physiol (2024). https://doi.org/10.1007/s00421-024-05484-5
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DOI: https://doi.org/10.1007/s00421-024-05484-5