NOVEL antioxidant and oxidant biomarkers related to sarcopenia in COPD

Background: The relation between oxidative stress (OS) and sarcopenia in COPD remains unknown. Objective: To analyze OS levels and its association with sarcopenia in COPD. Methods: Thirty-nine individuals with COPD (69 +/- 7years; 41%female) and thirty-five for the control group (69 +/- 7years; 43%female) were included. Advanced oxidation protein products (AOPP), paraoxonase-1 (PON1), superoxide dismutase activity (SOD), catalase dismutase activity (CAT), sulfhydryl group (SH), nitric oxide metabolites (NOX), total radical trapping antioxidant parameter (TRAP) were analysed. OS markers were correlated with handgrip and quadriceps strength, gait speed, skeletal muscle mass index, fat-free mass index, maximum inspiratory and expiratory pressure. European criteria were used to identify sarcopenia. Results: In COPD, antioxidant capacity was correlated with muscle mass and strength (r from 0.5 to 0.64) P<0.05 for all. TRAP <= 850 mu M/trolox and AOPP <= 65 mu M/l were associated with sarcopenia (OR:8.3; 95% CI: 1.4-49.6 and OR:14; 95%CI: 2.2-87.1, respectively; P<0.05 for both). Conclusion: OS is associated with sarcopenia in COPD. (C) 2020 Elsevier Inc. All rights reserved.

Automated summary

The study found that oxidative stress in patients with COPD is associated with sarcopenia, and antioxidant capacity is positively correlated with muscle mass and strength.