Figure 1.

Brief exercise increases the number and frequency of NK cells. (A). PBMC were isolated from the peripheral blood drawn either pre-exercise (white) and post-exercise (black) and extensively counted using a Neubauer hemocytometer. Shown are the mean counts (cells × 10⁶/mL ± SD) of all donors (n = 21), males only (n = 14), or females only (n = 7). (B). NK cells were subsequently purified from PBMC and extensively counted using a Neubauer hemocytometer. Shown are the mean counts (cells × 10⁶/mL ± SD) of all donors (n = 21), males only (n = 14), or females only (n = 7). Significant differences are indicated in the graph as follows: *p < 0.05, **p < 0.01, ***p < 0.001 (paired two tailed student’s t test).