*Article* **The Effect of Aerobic Exercise and Low-Impact Pilates Workout on the Adaptive Immune System**

**László Balogh 1,†, Krisztina Szabó 2,†, József Márton Pucsok 1, Ilona Jámbor 2, Ágnes Gyetvai 2, Marianna Mile 1, Lilla Barna 1, Peter Szodoray 3, Tünde Tarr 2, Zoltán Csiki <sup>2</sup> and Gábor Papp 1,2,\***


**Abstract:** Growing evidence indicates the pronounced effects of physical activity on immune functions, which may largely depend on the type of exercise, intensity, and duration. However, limited information is available regarding the effects of low-impact exercises, especially on the level of adaptive immune system. Our study aimed to investigate and compare the changes in a broad spectrum of lymphocyte subtypes after 14 weeks of aerobic-type total-body-shaping workouts (TBSW) and Pilates workouts (PW) among healthy individuals. We determined the percentages of peripheral natural killer cells and different T and B lymphocyte subtypes with flow cytometry. At the end of the exercise program, significant changes in naïve and memory lymphocyte ratios were observed in TBSW group. Percentages of naïve cytotoxic T (Tc) cells elevated, frequencies of memory Tc and T-helper cell subsets decreased, and distribution of naïve and memory B cells rearranged. Proportions of activated T cells also showed significant changes. Nonetheless, percentages of anti-inflammatory interleukin (IL)-10 producing regulatory type 1 cells and immunosuppressive CD4+CD127lo/−CD25bright T regulative cells decreased not only after TBSW but also after PW. Although weekly performed aerobic workouts may have a more pronounced impact on the adaptive immune system than low-impact exercises, both still affect immune regulation in healthy individuals.

**Keywords:** aerobic exercise; Pilates; adaptive immunity; regulatory T cell; interleukin-10
