Le thé vert préserve la sécrétion de testostérone et le système immunitaire
The acute effects of green tea and carbohydrate co-ingestion on systemic inflammation and oxidative stress during sprint cycling
Katsuhiko Suzuk Physiologie appliquée, nutrition et métabolisme, 2015 10.1139/apnm--0123
Green tea has anti-oxidative and anti-inflammatory effects which may be beneficial to athletes performing high intensity exercise. This study investigated the effects of carbohydrate and green tea co-ingestion on sprint cycling performance, and associated oxidative stress and immunoendocrine responses to exercise.
In a crossover design, nine well-trained male cyclists completed three sets of eight repetitions of 100 m uphill sprint cycling while ingesting green tea and carbohydrate (TEA) (22 mg/kg body mass catechins, 6 mg/kg body mass caffeine, 230 mg/kg glucose and 110 mg/kg fructose) or carbohydrate only (230 mg/kg body mass glucose and 110 mg/kg body mass fructose) (CHO) during each 10 min recovery period between sets. Blood samples were collected before exercise, 10 min after exercise and 14 h after exercise.
There was no effect of acute TEA ingestion on cycling sprint performance (p=0.285), although TEA maintained post-exercise testosterone and lymphocyte concentrations, which decreased significantly in the CHO group (p<0.001). While there was a trend for lower post-exercise neutrophil count with TEA (p=0.05), there were no significant differences between TEA and CHO for circulating cytokines (p>0.20), markers of oxidative stress and antioxidant capacity (p>0.17), adiponectin concentration (p=0.60) or muscle damage markers (p>0.64). While acute green tea ingestion prevents the post-exercise decrease in testosterone and lymphocytes, it does not appear to benefit cycling sprint performance or reduce markers of oxidation and inflammation when compared to carbohydrate alone.