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Biomarkers used in the included studies according to biological system. DHEA-S = Dehydroepiandrosterone sulfate; HbA1C = glycosylated hemoglobin; HDL = High-density lipoprotein; HOMA-IR = Homeostatic model assessment insulin resistance; IBIs = Inter-beat intervals; ICAM-1 = Intercellular adhesion molecule 1; IL-6 = Interleukin 6; LDL = Low-density lipoprotein; RMSSD = Root Mean Square of the Successive Differences (Heart rate variability).
