Juçara ( Euterpe edulis Martius) improves time-to-exhaustion cycling performance and increased reduced glutathione: a randomized, placebo-controlled, crossover, and triple-blind study.

Autor:	Copetti CLK; Nutrition Post-Graduate Program, Federal University of Santa Catarina, Florianopolis 88040900, Brazil., Diefenthaeler F; Biomechanics Laboratory, Department of Physical Education, Federal University of Santa Catarina, Florianopolis 88040000, Brazil., Lanferdini FJ; Biomechanics Laboratory, Department of Physical Education, Federal University of Santa Catarina, Florianopolis 88040000, Brazil., Dambrós BF; Nutrition Post-Graduate Program, Federal University of Santa Catarina, Florianopolis 88040900, Brazil., Marques BS; Laboratory of Lipids, Antioxidants, and Atherosclerosis, Department of Clinical Analysis, Federal University of Santa Catarina, Florianopolis 88040900, Brazil., da Silva EL; Laboratory of Lipids, Antioxidants, and Atherosclerosis, Department of Clinical Analysis, Federal University of Santa Catarina, Florianopolis 88040900, Brazil., Vieira FGK; Nutrition Post-Graduate Program, Federal University of Santa Catarina, Florianopolis 88040900, Brazil., Willems MET; Institute of Applied Sciences, University of Chichester, College Lane, Chichester, PO19 6PE, United Kingdom., Pietro PFD; Nutrition Post-Graduate Program, Federal University of Santa Catarina, Florianopolis 88040900, Brazil.
Jazyk:	angličtina
Zdroj:	Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme [Appl Physiol Nutr Metab] 2024 Jul 01; Vol. 49 (7), pp. 933-942. Date of Electronic Publication: 2024 Mar 19.
DOI:	10.1139/apnm-2023-0376
Abstrakt:	To examine the effects of 7-days juçara powder (JP) intake on oxidative stress biomarkers and endurance and sprint cycling performances. In a randomized, placebo-controlled, crossover, and triple-blind study, 20 male trained cyclists were assigned to intake 10 g of JP (240 mg anthocyanins) or placebo (PLA) for 7 days and performed a cycling time-to-exhaustion (TTE). A 5 s cycling sprint was performed before and after the cycling TTE. Blood oxidative stress biomarkers and lactate concentration where evaluated 1 h before (T-1), immediately after (T0), and 1 h after (T1) the cycling TTE. The mean duration time for the cycling TTE was 8.4 ± 6.0% (63 ± 17 s) longer in the JP condition (JP: 751 ± 283 s) compared to PLA (688 ± 266 s) ( P  < 0.019). Two-way repeated measures Analysis of variance showed an increase in the JP condition for reduced glutathione (GSH) ( P  = 0.049) at T0 ( P  = 0.039) and T1 ( P  = 0.029) compared to PLA with a moderate effect size at T0 ( d  = 0.61) and T1 ( d  = 0.57). Blood lactate levels increased over time in both conditions ( P ≤  0.001). No differences were observed for the post-TTE sprint fatigue index, total phenols, protein carbonyls, and glutathione peroxidase activity. Seven-day intake of JP improved cycling endurance performance and increased GSH levels but had no effect on lactate and cycling sprint-induced fatigue. Competing Interests: The authors declare that they have no competing interests.
Databáze:	MEDLINE
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