Abstract
Purpose
Green tea extract (GTE) supplementation has been proposed to possess anti-inflammatory properties. This study assessed the effects of GTE on endurance training (ET) induced changes on irisin, pro-inflammatory cytokines, adiponectin and anthropometric indices in overweight middle-aged males.
Methods
Participants were randomly assigned to three groups (n = 15): endurance training + placebo (ET + P), endurance training + green tea extract supplementation (ET + GTE), and no endurance training + placebo (P). The ET intervention consisted of an 8-week training program that included circuit training, fast walking or jogging performed three times/week at a moderate intensity (40–59% of the heart rate reserve). Participants received 500 mg/day GTE using a green tea capsule. Serum concentrations of interleukin 6 (IL-6), tumor necrosis factor-alpha (TNF-α), irisin, adiponectin, and high-sensitivity C-reactive protein (hs-CRP) were measured prior to and after the 8-week training intervention.
Results
Both exercise interventions decreased IL-6 and hs-CRP (p < 0.05), and increased adiponectin (p < 0.01) levels; changes in these variables were greater in the ET + GTE group compared to the ET + P and P groups (p < 0.01). Irisin concentrations increased only in the ET + GTE group and were different from the ET + P and P groups (p < 0.01). There were no changes in TNF-α concentrations in any of the groups. Both exercise interventions (ET + GTE and ET + P) decreased bodyweight, body mass index (BMI), body fat percentage (BFP), and visceral fat area (VFA) (p < 0.05), with greater changes in these variables occurring in the ET + GTE group compared to ET + P and P groups (p < 0.01).
Conclusion
The combination of GTE supplementation and ET produces beneficial anti-inflammatory and metabolic effects, which were greater than those produced by ET alone.
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Abbreviations
- ET:
-
Endurance training
- GTE:
-
Green tea extract
- hs-CRP:
-
High-sensitivity C-reactive protein
- IL-6:
-
Interleukin 6
- TNF-α:
-
Tumor necrosis factor alpha
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RB, AR and HZ conceived and designed research. AR provided essential reagents. RB and DAL conducted experiments. AW contributed new reagents or analytical tools. AW and MSM analyzed data. RB and DAL wrote the manuscript. BG, JSB, IL and HZ revised the manuscript. AR and HZ had primary responsibility for final content. All authors read and approved the manuscript.
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Communicated by Philip D Chilibeck.
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Bagheri, R., Rashidlamir, A., Ashtary-Larky, D. et al. Effects of green tea extract supplementation and endurance training on irisin, pro-inflammatory cytokines, and adiponectin concentrations in overweight middle-aged men. Eur J Appl Physiol 120, 915–923 (2020). https://doi.org/10.1007/s00421-020-04332-6
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DOI: https://doi.org/10.1007/s00421-020-04332-6