Abstract

Lymphocyte subsets, their responsiveness to mitogen and their capacity for glutamine oxidation and glycolysis were assessed in 7 subjects before and after an acute bout of interval exercise, in order to establish whether exercise is associated with alterations in lymphocyte metabolic capacities. Subjects exercised at 112 of their maximal work capacity on a treadmill and performed 25 repeat tests, each of 1 min duration interrupted by 2 min rest. Acute exercise was associated with significant decreases in the percentage of T- and B-cells and an increase in percentage of NK-cells. These changes were accompanied by a significant decrease in the responsiveness of peripheral blood lymphocytes to the mitogen concanavalin A. Acute exercise was also associated with profound changes in the metabolic capacities of peripheral blood lymphocytes: rates of 14CO2 production from (U-14C)glutamine (19) and lactate (27) production were increased significantly in response to interval exercise. Linear regression analysis revealed significant correlation between exercise-mediated changes () in T- and NK-cells and changes () in both lymphocyte responsiveness to concanavalin A and metabolic capacity, particularly glutamine oxidation to CO2. One interpretation of these data is that acute exercise promotes a redistribution in lymphocyte subsets, and that it is this redistribution that is the basis of both the impairment in lymphocyte responsiveness to mitogens and the increase in lymphocyte metabolic capacity, especially glutamine oxidation. Verf.-Ref.