IntrodutionCarbohydrates are the most abundant biomolecules on Earth. They are important for muscle contraction during prolonged exercise performing at moderate intensity and short duration exercise performed at high-intensity [1,2]. There is a considerable amount of studies related to the ergogenic effects of nutritional resources in sport performance [3]. Based on this evidence, this article aims to review the physiological and biochemical concepts and definitions of carbohydrates; searches for a relation between the consumption of carbohydrates and daily studies; and mainly analyzes the relations between consumption of carbohydrates and physical performance, analogously before, during and after the competition. To conduct the study was first done a widespread research looking for articles and scientific studies, and after that the research was filtered using up-to-date articles. The power of an athlete directly influences his physical performance [4]. In the pre-competition stage stored glycogen increases and prevents from depletion [5]. Supplementation during competition aims to replenish lost fluids and carbohydrates [6]. After a competition it is necessary to rehydrate, fill glycogen stores and recreate an electrolyte balance [3]. Literature reviews are important connectors that have been studied ….. where the science must advance. More research should be done to get to know the ideal carbohydrate intake appropriate for each sport.Carbohydrates, as the name suggests, are made up of water (H 2 O) and carbon, where hydrogen and oxygen are bonded together by a simple connection. They are the most abundant biomolecules on earth [2]. Carbohydrates are important for muscle contraction during performance of prolonged exercise at moderate intensity and high-intensity exercise with short duration [1]. Knowing this, the quest for improvement of the physical performance has increasingly led athletes to use dietary manipulation and nutrients intake. The maintenance of muscle glycogen stores is extremely important for high-performance athletes, where regular physical training and proper nutrition can positively affect the increase of these reserves [7]. Although it is clear that the increased use of nutritional supplements aims to muscle hypertrophy and improves the performance, many questions about the proper use of the supplements haven't yet been discussed. Due to evidences suggesting the importance of glycogen during performances, there is a great interest in maintaining inventories related with the level of glycogen in muscle and liver, thus it is generally recommended carbohydrate intake for athletes performing long term sports, due to their rapid metabolism [3]. Checking literature, we found a considerable amount of studies looking at the effects of nutritional ergogenic resources on exercise performance. Only in the 80s was conclusively demonstrated that ingesting carbohydrates during exercise can increase the athletes' performances. Also the correct and sufficient quantity of nutrients for athlete consumption ...