Effects of taurine and chocolate milk supplementation in body composition, athletic performance and oxidative stress in triathletes

• Grant number: 13/05620-7
• Support Opportunities: Regular Research Grants
• Start date: December 01, 2013
• End date: May 31, 2016
• Field of knowledge: Health Sciences - Nutrition - Nutrition Biochemistry
• Principal Investigator: Ellen Cristini de Freitas
• Grantee: Ellen Cristini de Freitas
• Host Institution: Escola de Educação Física e Esporte de Ribeirão Preto (EEFERP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil
• Associated researchers: Flávia Giolo De Carvalho ; Julio Sergio Marchini

Abstract

Taurine is a nitrogenous compound, naturally present in heart, leukocytes, retina, central nervous system, especially in muscles. It has several beneficial physiological effects like antioxidant action, and could increase muscle force contraction and insulin sensilbility. Triathlon is a sport of medium to high intensity, that can causes an increase in the rate of oxygen consumption during intense exercise and consequently increases free radicals production and oxidative stress, which may compromise an athlete's performance. Due to the weekly intense training, triathletes need nutritional care ranging from calories and nutrients adequacy to the use of specific nutrients that can help to maintain health. Thus, it is believed that the use of taurine associated with chocolate milk after exercise can promote general metabolic insulin action in order to favor carbohydrates metabolism regulation, assist muscle recovery, improve glycogenesis, prevent oxidative damage and thus promote triathletes performance and muscle mass gain. Objective: Evaluate the effects of taurine and chocolate milk supplementation in body composition, athletic performance and oxidative stress in triathletes. Methods: A double-blind, crossover, 2-week washout study will be conducted with 20 male triathletes, aged 30 to 45 years, which will be offered during eight weeks capsules containing three grams of taurine or placebo and 400 ml of chocolate milk ready to drink. In order to assess the effects of supplementation, concentrations of serum and urinary taurine, lactate, insulin and oxidative stress markers (MDA, GSH and vitamin E) will be quantified. Body composition will be measured by the method of deuterium labeled water. The evaluations will occur in four stages: 1o - before starting the training season; 2o - after 8 weeks of training; 3o- before starting the second training season, and 4o- after 8 weeks of training and supplementation completion. Data will be organized according to the study groups on average and standard deviation with application of analysis of variance test for verifying significant differences (p <0.05). (AU)