Revista Brasileira de Nutrição Esportiva

268-275

Authors: Carolina Barbosa Ribeiro, Sergio Henrique Borin, Carlos Alberto da Silva

Supplementation with branched chain amino acids has been disseminated widely among practitioners of physical activities. Studies suggest the development of central fatigue during activity, its correlation brain serotonin and leucine. Purpose of this study was to evaluate through tests of open field and elevated plus-maze, the behavior of rats supplemented with three different doses of leucine. Wistar rats were divided into groups: control (C), leucine 0.30mM/100g (L0,30), 1.25mM/100g (L1,25) and 5mM/100g (L5), supplemented via oral gavage. For statistical analysis, variance followed by Tukey test (p<0.05). The exploratory behavior was observed that rats L0,30 did not differ from C and the groups L1,25 and L5, showed a reduction. In the elevated plus-maze group C compared with L0,30 and L1,25 did not get the difference, the L5 group differed from the others. The results suggest the existence of physiological and behavioral changes related to supplementation with leucine. Key words: Leucine, Fatigue, Motor Activity, Behavior

285-297

Authors: Sabrina Ferreira Ribas

Introduction: Caffeine is one of the most used stimulant drugs in the world. This is an alkaloid belonging the methylxanthine family, whose formula is 1,3,7-trimethylxantine. When consumed in low dosages (2mg/Kg), caffeine increases wakefulness, decreases dorwsiness, relieves fatigue, increases the cathecolamine release, the heart rate, the diuresis and speeds up the metabolism. Due your several properties, your ergogenic effect has been studied a lot. It’s believed that this effect is associated with the possibility of caffeine powered the athletes performance, retarding the fatigue through mechanisms controlled by nervous system. Purpose: The purpose of this study was to review and discuss the related research about this subject in order to compare the effects of caffeine supplementation in different exercises, doses and used protocols. Conclusion: Caffeine has your ergogenic effect comproved in several exercises, with less effectiveness in high intensity and short term. The most potent dosage varies between 3-6mg/Kg. Its effects are better explained for the adenosine antagonism while other mechanisms are still contradictory. Non-users caffeine and high trained individuals present better results. Associated with carbohydrate it promotes increased performance when ingested during or post-exercise and combined with creatine, this last is impaired. Due the variety actions and tissues that it can act, caffeine needs more studies to improve the knowledge about your ergogenic potential. Key words: Caffeine, Fatigue, Performance, Ergogenic effect.

305-316

Authors: Elisa Celina Berezoski dos Santos, Fabiana Eufrasie de Oliveira Ribeiro, Rafaela Liberali

Objective: The objective of this study was to demonstrate the eating behavior of both men and women who exercise in the morning, at a gym club in Curitiba. Materials and methods: There were 22 physically active people studied, aged from 18 to 50 years. The research is characterized as a descriptive study performed through a simple survey. Results: 83.3% of survey respondents said that they eat before a workout. The most reccourent period of food ingestion before exercising among women (33,34%) was around 15 and 30 minutes, while between men (50%) it ranges from 30 to 45 minutes. The most consumed food itens by women were: coffee (53.33%), margarine or butter (46.66%), fruits, white bread, skimmed or semi-skimmed (40%); on the other hand, men chose sample juices, yogurt, water , or semi-skimmed milk (75%), white bread and whole wheat bread (50%). All men and 67.7% of women believe their meal before workout is correct. Everyday practices duration from 60 to 90 min were predominant among women, while to men the prevalent length of exercising ranges from 30 to 90 min. Concerning to symptoms during their exercises presented by the group of active people, 59.09% of them reported to feel thirsty; 22.72% related fatigue; dizziness was described by 18.18%; 13.63% presented no symptoms; 9.09% felt drowsiness; and 4.54% had headaches. Discussion: Morning exercise practicers keep the habit of consuming food before workout. Conclusion: There is no doubt that it is necessary the consumption of the correct food itens before exercising. Key words: Nutrition, Breakfast, Feeding Behavior, Feeding Pre-Exercise.

326-335

Authors: Patrícia Szuck, Daniela de Almeida Santos, Renata Pietro Bom, Francisco Navarro, Fabiano de Macedo Salgueirosa

Objective: The objective of this review is to critically analyze the studies on the effect of supplementation and / or antioxidant diet on oxidative stress induced by exercise. Literature Review: Selected works from 1992 to 2010, totaling 48 articles (43 international, 05 national). The systematic review demonstrated that there are few studies showing positive results with antioxidant supplementation on oxidative stress induced by exercise. Improper use of antioxidant supplements can prevent necessary adaptations and beneficial exercise and interfere with hormesis. Conclusion: Physical exercise can lead to oxidative stress, but the overuse of antioxidant supplements to try to control it may interfere with adaptations and not necessary. Thus long-term studies on the actual need additional antioxidants to practitioners of physical exercise are necessary and extremely important, trying to establish parameters for the use of supplements and protocol standards. Key words: Oxidative stress, Supplements / antioxidant foods, Free radicals, Exercise.

342-347

Authors: Thierry Lemos da Silva, Isa Angélica Moreira

The basis for achieving the minimum demand required, both energetic and nutritional, for the routine day to day work and of a the practice of sports is the realization of a balanced diet. In subjects with heavy work routines that also practice sports nutrition becomes even more important. The analysis of anthropometric profile enables a proper meal planning, thus impacting on the improvement of the performance in both of the activities. The study aimed to evaluate the anthropometric and nutritional profile of garbage collectors that were also training for a half marathon. We evaluated five street sweepers with average age, weight, height, BMI, of 30.8% G ± 5.67 years, 68.6 ± 13.40 kg, 1.73 ± 0.11 m, 22.66 ± 242 kg / m², 9.03 ± 3.21% respectively. The averaged energy consumption were (EC) 2557.13 ± 326.08 kcal and the average caloric intake for this group is 3872.47 ± 756.56 kcal, in the macronutrients evaluation of the garbage collectors the consumption were of 5.75 g / kg and 60.36% of the EC-CHO, 1.6 g / kg and 17.08% for PTN, 0.96 g / kg and 22.55% of LIP, in accordance with the recommendations of the 2009 SBME guideline. It can be concluded that the energy consumption of this population is less than the daily necessities, but the intake of macronutrients and anthropometric profile of the recommendations are appropriate. Key words: Garbage Collector, Runners, Food Intake, Profile Anthropometry.