Evaluation of immune response after moderate and overtraining exercise in wistar rat

Document Type : Original Article

Authors

1 Neurogenic Inflammation Research Centre and Department of Physiology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran

2 Neurocognitive Research Centre, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran

3 Immunology Research Center, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran

Abstract

 




Objective(s):
The effect of prolonged overtraining on cytokine kinetics was compared with moderate exercise in the present study.
 
Materials and Methods:
Male Wistar rats were randomly divided into control sedentary (C), moderate trained (MT), (V=20 m/min, 30 min/day for 6 days a week, 8 weeks), overtrained (OT) (V=25 m/min, 60min/day for 6 days a week, 11 weeks) and recovered overtrained (OR) (OT plus 2 weeks recovery) groups, (n=6 for each group). Immediately, 24 hr and 2 weeks (in OR) after last bout of exercise blood samples were obtained. The plasma concentrations of TNFα, IL-6, IL-10, IL-4 and IFN were measured by ELISA method.
Results:
Immediately after last bout of exercise the following findings were observed; IL-6, IL-10 and TNFαconcentrations increased in OT and OR groups compared with control (P<0.05–P<0.001). Serum level of IL-4 decreased (P<0.01) but IFN increased (P<0.05) in MT group vs. control. In addition, circulatory levels of TNFα IL-6, IL-10 and IL-4 were higher but the IFN concentrations were lower in OT and OR groups than MT group (P<0.05-P<0.01). The IFN-γIL4 ratio was significantly increased in MT (P<0.01) while it decreased in OT group. There were not statistical differences in TNFα IL-6, and IFN levels between different time intervals after exercise in MT, OT and OR groups.
Conclusion:
These data confirm a positive effect of moderate exercise on immune function and a decrease in susceptibility to viral infection by inducing Th1 cytokine profile shift. However, prolonged and overtraining exercise causes numerous changes in immunity that possibly reflects physiological stress and immune suppression.

Keywords

References

 
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