Potential ergogenic activity of grape juice in runners.
Recent studies have indicated that certain food products have ergogenic potential similar to that of sports supplements. The present study aimed to investigate the potential ergogenic effect of integral purple grape juice on the performance of recreational runners. Twenty-eight volunteers of both sexes (age, 39.8 ± 8.5 years; peak oxygen consumption, 43.2 ± 8.5 mL/(kg·min)) were randomized into either a group that received grape juice (grape juice group (GJG), n = 15; 10 mL/(kg·min) for 28 days) or a group that received an isocaloric, isoglycemic, and isovolumetric control beverage (control group (CG), n = 13). A time-to-exhaustion exercise test, anaerobic threshold test, and aerobic capacity test were performed, together with assessments of markers of oxidative stress, inflammation, immune response, and muscle injury, performed at baseline and 48 h after the supplementation protocol. The GJG showed a significant increase (15.3%) in running time-to-exhaustion (p = 0.002) without significant improvements in either anaerobic threshold (3.6%; p = 0.511) or aerobic capacity (2.2%; p = 0.605). In addition, GJG exhibited significant increases in total antioxidant capacity (38.7%; p = 0.009), vitamin A (11.8%; p = 0.016), and uric acid (28.2%; p = 0.005), whereas α-1-acid glycoprotein significantly decreased (20.2%; p = 0.006) and high-sensitivity C-reactive protein levels remained unchanged. In contrast, no significant changes occurred in any of these variables in the CG. In conclusion, supplementation with purple grape juice shows an ergogenic effect in recreational runners by promoting increased time-to-exhaustion, accompanied by increased antioxidant activity and a possible reduction in inflammatory markers.
a Department of Nutrition, Federal University of Paraiba, CEP 58051-900, João Pessoa, Paraíba, Brazil.
Lydiane Tavares
LT
Toscano
a Department of Nutrition, Federal University of Paraiba, CEP 58051-900, João Pessoa, Paraíba, Brazil.
Renata Leite
RL
Tavares
a Department of Nutrition, Federal University of Paraiba, CEP 58051-900, João Pessoa, Paraíba, Brazil.
Luciana Tavares
LT
Toscano
a Department of Nutrition, Federal University of Paraiba, CEP 58051-900, João Pessoa, Paraíba, Brazil.
Cássia Surama Oliveira da
CS
Silva
b Department of Physical Education, Federal University of Paraíba, CEP 58040-490, João Pessoa, Paraiba, Brazil.
Antônio Eduardo Monteiro de
AE
Almeida
c Brazilian Agricultural Research Corporation, Semi-arid Region (Embrapa Semi-arid), CEP 56302-970, Petrolina, Pernambuco, Brazil.
Aline Camarão Telles
AC
Biasoto
a Department of Nutrition, Federal University of Paraiba, CEP 58051-900, João Pessoa, Paraíba, Brazil.
Maria da Conceição Rodrigues
Mda C
Gonçalves
b Department of Physical Education, Federal University of Paraíba, CEP 58040-490, João Pessoa, Paraiba, Brazil.
Alexandre Sérgio
AS
Silva
D000328:Adult; D015308:Anaerobic Threshold; D000893:Anti-Inflammatory Agents / Q000008:administration & dosage*; D000975:Antioxidants / Q000008:administration & dosage*; D001938:Brazil; D005260:Female; D000067030:Fruit and Vegetable Juices; D055951:Functional Food; D006801:Humans; D018836:Inflammation Mediators / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D018763:Muscle Fatigue; D018482:Muscle, Skeletal / Q000378:metabolism*; D009752:Nutritional Status; D018384:Oxidative Stress; D010101:Oxygen Consumption; D058573:Performance-Enhancing Substances / Q000008:administration & dosage*; D010807:Physical Endurance; D012420:Running; D013997:Time Factors; D027843:Vitis
D000893:Anti-Inflammatory Agents; D000975:Antioxidants; D018836:Inflammation Mediators; D058573:Performance-Enhancing Substances
aliment fonctionnel; antioxidant; antioxydant; athletic performance; functional food; inflammation; oxidative stress; performance sportive; polyphenols; polyphénols; stress oxydatif