Impact of Physical Activity on Monocyte Subset CCR2 Expression and Macrophage Polarization Following Moderate Intensity Exercise
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Purpose: To determine the impact of physical activity status on monocyte subset CCR2 surface expression and macrophage polarization in response to an acute bout of moderate intensity cycle ergometry.
Methods: 24 healthy women and men (12 high physically active [HIACT]: ≥1500 METmin/wk MVPA & 12 low physically active [LOACT]: <600 METmin/wk MVPA) underwent an acute moderate intensity (60% VO) bout of cycle ergometry for 30 min. Blood samples were collected prior to (PRE), immediately (POST), 1 h (1H), and 2 h (2H) following exercise. Monocyte CCR2 and macrophage CD86 (M1) and CD206 (M2) were analyzed by flow cytometry.
Results: Intermediate monocyte CCR2 decreased in response to exercise in the HIACT group (PRE: 11409.0 ± 1084.0 vs. POST: 9524.3 ± 1062.4; p = 0.034). Macrophage CD206 was lower in the LOACT compared to the HIACT group at 1H (HIACT: 67.2 ± 5.6 vs. LOACT: 50.1 ± 5.2%; p = 0.040). Macrophage CD206 at 1H was associated with both PRE (r = 0.446, p = 0.043) and POST (r = 0.464, p = 0.034) non-classical monocyte CCR2.
Conclusion: These data suggest that regular moderate to vigorous physical activity positively impacts both monocytes and macrophages following acute moderate intensity exercise and that this impact may contribute to the prevention of coronary artery disease.
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