Acute Heavy Resistance Exercise Protocol Increases Extracellular Heat Shock Protein Without Changes in Associated
Jacob S Bowie1, Adam J Sterczala1, William J Kraemer1,2
1Department of Kinesiology, University of Connecticut, Storrs, Connecticut; and.
Abstract:
Bowie, JS, Sterczala, AJ, Kraemer, WJ, Maresh, CM, Comstock, B, Muñoz, CX, McKenzie, AL, Volek, JS, and Lee, EC. Acute heavy resistance exercise protocol increases extracellular heat shock protein without changes in associated cytokines. J Strength Cond Res 40(5): 528-535, 2026-The purpose of this investigation was to characterize changes in extracellular HSP70 (eHSP70) and associated cytokines (interleukin 1 beta, interleukin-6, interleukin 10, interleukin 12, p70, and tumor necrosis factor alpha) in response to a stressful acute heavy resistance exercise protocol (AHREP). Healthy, resistance-trained men ( n = 10, 24 ± 5 years, 176.8 ± 5.5 cm, 84.65 ± 12.78 kg, 17.6 ± 6.3% body fat, 145 ± 18 kg back squat 1 repetition maximum) completed an AHREP (6 × 10 back squat). Blood samples were collected before exercise (PRE), immediately post (IP), and at 15, 30, 60, and 120 minutes, and 24, 48, and 72 hours postexercise. White blood cell (WBC) count was measured with automated hematology, cytokines were measured with flow cytometry, and eHSP70 was measured by ELISA. Data were analyzed with repeated measures analysis of variance, with significant main effects further examined using post hoc pairwise t -tests. Extracellular HSP70 levels increased after exercise (PRE 0.39 ± 0.24 vs. IP 0.57 ± 0.37 vs. ng·mL -1 , p < 0.05) sustained to 15 minutes postexercise (0.52 ± 0.35 ng·mL -1 , p < 0.05) before returning to baseline at 30 minutes (0.424 ± 0.315 ng·mL -1 , p > 0.05). White blood cell shifts (PRE 6 ± 2 vs. IP 11 ± 4 cells·10 3 ·μL -1 , p < 0.001) were coincident with postexercise increases in chemoattractant cytokine IL-8 (PRE 4.77 ± 2.73 vs. IP 6.38 ± 3.53%, p < 0.05). We demonstrate that a sufficiently stressful resistance training protocol can activate pathways typically associated with aerobic exercise and heat exposure. The AHREP evokes a similar cardiovascular stress to aerobic protocols, which similarly increase eHSP70.
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