Elevation of Peripheral Blood CD34+ and Platelet Levels After Exercise With Cooling and Compression

Purpose To analyze the cellular response and chemokine profiles following exercise using cooling and blood flow restriction on the Vasper system. Methods Healthy male patients between the ages of 20 and 39 years were recruited. Testing was performed on the Vasper system, a NuStep cross‐trainer with concomitant 4‐limb venous compression with proximal arm cuffs at 40 mm Hg and proximal leg cuffs at 65 mm Hg. A cooling vest and cooling mat (8.3°C) were used. A 7‐minute warm‐up followed by alternating 30‐ and 60‐second sprints with 1.5 and 2 minutes of active recovery, respectively, between each sprint. Peripheral blood was drawn before exercise, immediately following exercise (T20), 10 minutes after the first post‐exercise blood draw (T30), and then every 30 minutes (T60, T90, T120, T150, T180). A blood draw occurred at 24 hours’ postexercise. Complete blood count, monoclonal flow cytometry for CD34+, and enzyme‐linked immunosorbent assay were used to analyze the samples. Results Sixteen healthy male patients (29.5 ± 4.5years, 1.78 ± 0.05m, 83.7 ± 11.4 kg) were enrolled. There was an immediate, temporary increase in white blood cell counts, marked by an increase in lymphocyte differential (38.3 ± 6.5 to 44.3 ± 9.0%, P = .001), decrease in neutrophil differential (47.8 ± 6.6 to 42.0 ± 9.1%, P < .001), and platelets (239.5 ± 57.2 to 268.6 ± 86.3 K⋅μL –1 , P = .01). Monocytes significantly decreased from PRE to T90 (9.8 ± 1.1 to 8.9 ± 1.1K/μL, P < .001) and T120 (8.9 ± 1.1 K/μL, P < .0001). There was a significant increase in CD34+ cells (3.9 ± 2.0 to 5.3 ± 2.8 cells⋅μL –1 , P < .001). No detectable differences in measured cytokine levels of interleukin (IL)‐10, IL‐6, granulocyte‐macrophage colony‐stimulating factor , IL‐1ra, tumor necrosis factor‐α, or IL‐2 were observed. Conclusions A significant elevation of peripheral blood CD34+ and platelet levels immediately following the exercise session was observed; however, there was no effect on peripheral circulation of IL‐10, IL‐6, IL‐1ra, tumor necrosis factor‐α, or IL‐2. Clinical Relevance Exercise can be considered as a way to manipulate point‐of‐care blood products like platelet‐rich plasma and may increase product yield.

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