Lemon Verbena Extract Oxidative Stress and Muscle Damage

In the present study, investigators investigated whether supplementation with lemon verbena extract (LVE) could improve muscle damage and biochemical indicators after exhaustive exercise challenge. Based on maximum jump heights, 60 subjects (30 males and 30 females) were equally divided into a placebo group (0 mg/human/day) and an LVE supplement group (400 mg/human/day), with gender-equal distribution. All subjects started supplementation 10 days before exhaustive exercise and continued it until all tests were completed. Before the intervention, after the exhaustive exercise, and on the following 3 days, the participants underwent 12-minute Cooper running/walking; blood collection; assessments of pain, muscle stiffness, maximum jump heights, and isometric maximum muscle strength; and anaerobic strength tests.

To assess inflammation indicators, volunteers fasted for at least 8 hours before performing muscle exhaustion exercises. At designated time points in the recovery period, including baseline (0) and 3h, 24h, and 48 after exercise, blood samples were collected with brachial venous catheters. Assess serum IL-6 levels (pg/ml) to monitor physiological fitness. Used commercial kit human IL-6 immunoassay (R&D system, Minnesota, USA) and Elisa reader (PerkinElmer, Massachusetts, USA) for analysis

To assess muscle damage, volunteers fasted for at least 8 hours before performing muscle exhaustion exercises. At designated time points in the recovery period, including baseline (0) and 3h, 24h, and 48 after exercise, blood samples were collected with brachial venous catheters. Serum CK (U/L), were assessed for monitoring physiological adaptation. All biochemical indices were assessed using an autoanalyzer (Hitachi 7060, Tokyo, Japan).

Subjects' urine was collected 24 hours after the exhaustive exercise for analysis. Used commercial kit human 8-OHdG (Cayman, Mich, USA) and Elisa reader (PerkinElmer, Massachusetts, USA) for analysis

3 h, 24h, 48h after exhausting exercise, use Myoton machine to evaluate muscle stiffness (N/m) (Myoton, Tallinn, Estonia)

3 h, 24h, 48h after exhausting exercise, use VAS questionnaire to record muscle pain. the minimum is 0 and maximum is 10, and whether higher scores mean more pain

Inclusion Criteria: health Must be able to swallow tablets Exclusion Criteria: non-smokers no musculoskeletal medical metabolic disease women not on the reproductive cycle high blood pressure, asthma skeletal neuromuscular injuries in the upper or lower extremities

Lee MC, Hsu YJ, Ho CS, Chang CH, Liu CW, Huang CC, Chiang WD. Evaluation of the Efficacy of Supplementation with Planox(R) Lemon Verbena Extract in Improving Oxidative Stress and Muscle Damage: A Randomized Double-Blind Controlled Trial. Int J Med Sci. 2021 May 3;18(12):2641-2652. doi: 10.7150/ijms.60726. eCollection 2021.