Altered Inflammatory Oxidative and Metabolic Responses to Exercise in Pediatric Obesity and Type 1 Diabetes

摘要

Obesity (Ob) and type 1 diabetes (T1DM) are associated with increased inflammation and oxidative stress, which are major pathogenetic pathways toward higher cardiovascular risks. While long-term exercise protects against systemic inflammation and oxidation, acute exercise actually exerts pro-inflammatory and oxidative effects, prompting the necessity for better defining these molecular processes in at-risk patients; in particular, very little is known regarding obese and T1DM children. We therefore examined key inflammatory and oxidative stress variables during exercise in 138 peripubertal children (47 Ob, 12.7±0.4 yr, 22F, BMI% 97.6±0.2; 49 T1DM, 13.9±0.2 yr, 20F, BMI% 63.0±3.6; 42 healthy, CL, 13.5±0.5 yr, 24F, BMI% 57.0±3.6), who performed 10 bouts of 2-min cycling ~80% VO2max, separated by 1-min rest intervals. Blood samples were drawn at baseline and peak-exercise. Ob displayed elevated baseline interleukin-6 (IL-6, 2.1±0.2 pg/mL, p<0.005) vs. CL (1.5±0.3), while T1DM displayed the greatest maximum exercise-induced change in IL-6 (1.2±0.3) than in both Ob (0.7±0.1, p< 0.001) and CL (0.6±0.1, p<0.0167). Myeloperoxidase (MPO) was elevated in T1DM (143±30 ng/mL, p<0.0167) vs. CL (89±10) and Ob (76±6), while increases in exercise only occurred in Ob and CL. Disparate baseline and exercise responses were also observed for 8-hydroxy-2′-deoxyguanosine, glutathione, and F2-isoprostane. This data show distinct patterns of dysregulation in baseline and adaptive immunologic and oxidative responses to exercise in Ob and T1DM. A full understanding of these alterations is required so that developing exercise regimens aimed at maximizing health benefits for specific dysmetabolic states can be achieved based on complete scientific characterization rather than empirical implementation.