(School of Physical Education,Sichuan Normal University,Chengdu 610068,China) Abstract: In order to probe into the effects of exercise stress on the deviation of Th1 and Th2 as well as its relations with cortisol (Cor), blood lactic acid (BLA) and blood urea nitrogen (BUN), the author used male college students not majoring in physical education as the research subjects, who exercised to an extremely exhausted condition by repeatedly riding on a treadmill with 200 W of power for 2 min and then resting for 5 min in a stomach empty con-dition. The author tested the Th1 type cytokine, interferon-γ (IFN-γ), Th2 type cytokine, interleukin-4 (IL-4), T- lymphocyte transduction index (T-LTI), blood serum immunoglobulins (IgG, IgA and IgM), as well as the concen-trations of blood serum Cor, BLA and BUN, before exercising, immediately after exercising and in 3 h after exer-cising, and revealed the following findings: IFN-γ, the radio of IFN-γ to IL-4 and T-LTI dropped respectively by 37%, 30%, 31%, 31%, 39% and 28% immediately after exercising and in 3 h after exercising (P<0.001); there is no significant change in IL-4 as well as immunoglobulins IgG, IgA and IgM in blood serum after exercising; the concentrations of blood serum Cor, BLA and BUN increased respectively by 95%, 314% and 31% immediately after exercising (P<0.001), but they had no significant recovery after resting for 3 h; a positive correlation is shown re-spectively between IFN-γ and T-LTI as well as between the ratio of IFN-γ to Il-4 and T-LTI (P<0.05); a negative correlation is shown respectively between IFN-γ/IL-4 and Cor、BUN and BLA as well as between IFN-γ and Cor and BUN (P<0.05); a negative correlation is shown respectively between T-LTI and Cor、BLA and BUN (P<0.05); there is no significant correlation between IFN-γ and Ig as well as between IL-4 and BLA and BUN. The findings indicate that under exercise stress Th1 deviated towards Th2 and cell’s immune functions were weakened. These changes are related to the increase of the concentrations of blood serum Cor, BLA and BUN. Key words: excise stress;Th1 type cytokine interferon-γ;Th2 type cytokine interleukin-4;cortisol;blood lactic acid;urea nitrogen;T-lymphocyte transduction index |