Table 2.
Flow cytometry data (mean ± SEM) for gated lymphocytes
| Parameter | Young adults | Older adults | P | |
|---|---|---|---|---|
| Percentage of gated lymphocytes expressing a phenotype | Non-exercising | Exercising | ||
| CD3 | 71.40 ± 1.40 | 76.7 ± 1.75 | 70.4 ± 1.85 | 0.152 |
| CD3/CD49d | 65.2 ± 1.52 | 71.4 ± 2.21 | 53.0 ± 3.24 | <0.001 |
| CD3/CD4 | 42.95 ± 1.37 | 42.87 ± 1.58 | 51.8 ± 2.99 | 0.011 |
| CD3/CD4/CD49d | 37.1 ± 1.32 | 38.0 ± 1.38 | 36.8 ± 2.92 | 0.747 |
| CD3/CD8 | 23.7 ± 1.53 | 23.2 ± 2.41 | 16.4 ± 2.03 | 0.026 |
| CD3/CD8/CD49d | 23.2 ± 1.47 | 23.3 ± 2.19 | 15.6 ± 2.06 | 0.010 |
| Overall counts of gated lymphocytes (× 109/L) | 2.19 ± 0.15 | 2.07 ± 0.15 | 1.69 ± 0.18 | 0.673 |
| Absolute numbers of gated lymphocytes expressing a phenotype (× 109/L) | ||||
| CD3 | 1.54 ± 0.09 | 1.58 ± 0.06 | 1.27 ± 0.17 | 0.189 |
| CD3/CD49d | 1.40 ± 0.08 | 1.47 ± 0.09 | 0.98 ± 0.14 | 0.008 |
| CD3/CD4 | 0.92 ± 0.06 | 0.89 ± 0.06 | 0.84 ± 0.09 | 0.674 |
| CD3/CD4/CD49d | 0.80 ± 0.05 | 0.78 ± 0.05 | 0.66 ± 0.66 | 0.388 |
| CD3/CD8 | 0.52 ± 0.05 | 0.48 ± 0.06 | 0.30 ± 0.06 | 0.024 |
| CD3/CD8/CD49d | 0.51 ± 0.05 | 0.48 ± 0.5 | 0.28 ± 0.06 | 0.016 |
SEM = The standard error of the mean.