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Effect of thyme extract supplementation on lipid peroxidation, antioxidant capacity, PGC-1α content and endurance exercise performance in rats
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Effect of thyme extract supplementation on lipid peroxidation, antioxidant capacity, PGC-1α content and endurance exercise performance in rats
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Journal Article
Effect of thyme extract supplementation on lipid peroxidation, antioxidant capacity, PGC-1α content and endurance exercise performance in rats
2017
Overview
Background
Athletes have a large extent of oxidant agent production. In the current study, we aimed to determine the influence of thyme extract on the endurance exercise performance, mitochondrial biogenesis, and antioxidant status in rats.
Methods
Twenty male Wistar rats were randomly divided into two groups receiving either normal drinking water (non-supplemented group,
n
= 10) or thyme extract, 400 mg/kg, (supplemented group,
n
= 10). Rats in both groups were subjected to endurance treadmill training (27 m/min, 10% grade, 60 min, and 5 days/week for 8 weeks). Finally, to determine the endurance capacity, time to exhaustion treadmill running at 36 m/min speed was assessed. At the end of the endurance capacity test, serum and soleus muscle samples were collected and their superoxide dismutase (SOD) and glutathione peroxidase (GPx) activity, as well as malondialdehyde (MDA) concentration were measured. Protein expression of PGC-1α, as a marker of mitochondrial biogenesis, was also determined in the soleus muscle tissue by immunoblotting assay.
Results
Findings revealed that the exhaustive running time in the treatment group was significantly (
p
< 0.05) prolonged. Both serum and soleus muscle MDA levels, as an index of lipid peroxidation, had a threefold increase in the thyme extract supplemented group (t
18
= 8.11,
p
< 0.01; t
18
= 4.98,
p
< 0.01 respectively). The activities of SOD and GPx of the soleus muscle were significantly (
p
< 0.05) higher in the non-supplemented group, while there was no significant difference in serum SOD, GPx activities, and total antioxidant capacity between groups. Furthermore, thyme supplementation significantly (
p
< 0.05) decreased PGC-1α expression.
Conclusions
Thyme extract supplementation increased endurance exercise tolerance in intact animals, although decrease of oxidative stress and regulation of the PGC-1α protein expression are not considered as underlying molecular mechanisms.
Publisher
BioMed Central,Taylor & Francis Group
Subject
/ athletes
/ exercise
/ Lipid Peroxidation - drug effects
/ Male
/ males
/ Medicine
/ muscles
/ oxidants
/ Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha - blood
/ Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha - drug effects
/ Physical Conditioning, Animal
/ Physical Endurance - drug effects
/ Plant Extracts - administration & dosage
/ Plant Extracts - pharmacology
/ Rats
/ thyme
