Abstract
Purpose
To verify the acute and chronic effects of high-intensity intermittent training (HIIT) on interleukin 15 (IL-15) response and the relationship between circulating IL-15 concentrations and muscle damage in young men.
Methods
Physically active men performed two different training protocols at moderate and high intensity, three times per week for 5 weeks. Twenty subjects were randomly allocated into high-intensity intermittent training group (HIIT-5 km 1 min at 100% of maximal aerobic speed interspersed by 1 min passive recovery; n = 10) or moderate-intensity continuous training group (MICT-5 km 70% of maximal aerobic speed; n = 10). An acute exercise session was performed with blood sample collection pre-exercise, immediately post-exercise, and 60 min post-exercise (before and after 5 weeks of training). Blood samples were used to analyze serum IL-15 and creatine kinase (CK) concentrations.
Results
The results showed no changes in serum IL-15 concentrations independent of protocol, moment measurement, and intervention period. CK concentrations showed higher values post-exercise when compared to pre-exercise in both protocols. No significant relationship was found between serum IL-15 and CK concentrations.
Conclusion
Our findings point to the absence of acute and chronic changes in serum IL-15 concentrations in response to 5 weeks of high-intensity intermittent training. In addition, data suggest that the release of this cytokine is not related to muscle damage in healthy young men.
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Acknowledgements
Thaislaine dos Santos would like to thank Fundação de Amparo à Pesquisa do Estado de São Paulo (Fapesp) for their support (2016/12145–1). The authors would like to thank Prof. Dr. Valéria Leme Gonçalves Panissa for the statistical analysis.
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The study was approved by the Research Ethics Committee for studies involving human participants at the State University (Unesp) of the Presidente Prudente School of Technology and Sciences/SP (53297815.8.0000.5402).This study complies with the 1964 Helsinki declaration and its later amendments.
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dos Santos, T., Lira, F. & Antunes, B.M. Interleukin-15 and creatine kinase response to high-intensity intermittent exercise training. Sport Sci Health 16, 479–484 (2020). https://doi.org/10.1007/s11332-020-00629-3
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DOI: https://doi.org/10.1007/s11332-020-00629-3