Lydiane de Lima Tavares Toscano1,2, Alexandre Sérgio Silva3,4, Ana Carla Lima de França1,2, Bruno Rafael Virgínio de Sousa1,2, Eder Jackson Bezerra de Almeida Filho2, Matheus da Silveira Costa1,2, Aline Telles Biasoto Marques5, Darcilene Fiuza da Silva6, Klécia de Farias Sena2, Gilberto Santos Cerqueira7, Maria da Conceição Rodrigues Gonçalves1. 1. Programa de Pós-graduação em Ciências da Nutrição, Universidade Federal da Paraíba (UFPB), João Pessoa, Paraíba, Brazil. 2. Laboratório de Estudos do Treinamento Físico Aplicado ao Desempenho e a Saúde, Departamento de Educação Física, Universidade Federal da Paraíba (UFPB), Centro de Ciências da Saúde, Campus I, Cidade Universitária, João Pessoa, Paraíba, CEP 58059-900, Brazil. 3. Programa de Pós-graduação em Ciências da Nutrição, Universidade Federal da Paraíba (UFPB), João Pessoa, Paraíba, Brazil. alexandresergiosilva@yahoo.com.br. 4. Laboratório de Estudos do Treinamento Físico Aplicado ao Desempenho e a Saúde, Departamento de Educação Física, Universidade Federal da Paraíba (UFPB), Centro de Ciências da Saúde, Campus I, Cidade Universitária, João Pessoa, Paraíba, CEP 58059-900, Brazil. alexandresergiosilva@yahoo.com.br. 5. Empresa Brasileira de Pesquisa Agropecuária, Embrapa Semiárido, Petrolina, Pernambuco, Brazil. 6. Faculdade de Farmácia, Universidade Federal da Bahia, Salvador, Bahia, Brazil. 7. Departamento de Morfologia, Universidade Federal do Ceará, Fortaleza, Ceará, Brazil.
Abstract
PURPOSE: To investigate the effects of a single dose of juice on physical performance, oxidative stress, inflammation and muscle damage in runners. METHODS:Fourteen recreational male runners (39 ± 9 years, VO2peak = 55.9 ± 6.5 ml/kg/min) performed two running tests to exhaustion at 80% of VO2max after ingesting grape juice or a placebo drink (10 ml/kg/day) randomly. Blood samples were taken before and 2 h after supplementation and immediately after running to analyze total antioxidant capacity (TAC), malondialdehyde (MDA), alpha-1 acid glycoprotein (A1GPA), high-sensitivity C-reactive protein (hs-CRP), creatine kinase (CK) and lactate dehydrogenase (LDH). RESULTS: The participants ran for an average of 59.2 ± 27.8 min until exhaustion in the placebo group and for 68.4 ± 29.7 min until exhaustion in the grape juice intake group, which was a significantly longer time (p = 0.008). This improvement in physical performance was accompanied by a 43.6% increase in TAC (p = 0.000) at the post-exercise timepoint compared to the level at baseline. MDA, A1GPA, hs-CRP, CK, and LDH did not exhibit changes. In contrast, no significant change in any variable was observed after consuming the placebo drink. CONCLUSION: The single-dose intake of purple grape juice demonstrated an ergogenic effect in recreational runners by increasing run time to exhaustion and increasing antioxidant activity.
RCT Entities:
PURPOSE: To investigate the effects of a single dose of juice on physical performance, oxidative stress, inflammation and muscle damage in runners. METHODS: Fourteen recreational male runners (39 ± 9 years, VO2peak = 55.9 ± 6.5 ml/kg/min) performed two running tests to exhaustion at 80% of VO2max after ingesting grape juice or a placebo drink (10 ml/kg/day) randomly. Blood samples were taken before and 2 h after supplementation and immediately after running to analyze total antioxidant capacity (TAC), malondialdehyde (MDA), alpha-1 acid glycoprotein (A1GPA), high-sensitivity C-reactive protein (hs-CRP), creatine kinase (CK) and lactate dehydrogenase (LDH). RESULTS: The participants ran for an average of 59.2 ± 27.8 min until exhaustion in the placebo group and for 68.4 ± 29.7 min until exhaustion in the grape juice intake group, which was a significantly longer time (p = 0.008). This improvement in physical performance was accompanied by a 43.6% increase in TAC (p = 0.000) at the post-exercise timepoint compared to the level at baseline. MDA, A1GPA, hs-CRP, CK, and LDH did not exhibit changes. In contrast, no significant change in any variable was observed after consuming the placebo drink. CONCLUSION: The single-dose intake of purple grape juice demonstrated an ergogenic effect in recreational runners by increasing run time to exhaustion and increasing antioxidant activity.
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