Glykogensyntes i muskulaturen efter träning

[King Grub]

Since the pioneering studies conducted in the 1960s in which glycogen status was investigated utilizing the muscle biopsy technique, sports scientists have developed a sophisticated appreciation of the role of glycogen in cellular adaptation and exercise performance, as well as sites of storage of this important metabolic fuel. While sports nutrition guidelines have evolved during the past decade to incorporate sport-specific and periodized manipulation of carbohydrate (CHO) availability, athletes attempt to maximise muscle glycogen synthesis between important workouts or competitive events so that fuel stores closely match to the demands of the prescribed exercise. Therefore, it is important to understand the factors that enhance or impair this biphasic process. In the early post-exercise period (0-4 h), glycogen depletion provides a strong drive for its own resynthesis, with the provision of carbohydrate (CHO; ~ 1 g/kg body mass [BM]) optimizing this process. During the later phase of recovery (4-24 h), CHO intake should meet the anticipated fuel needs of the training/competition, with the type, form and pattern of intake being less important than total intake. Dietary strategies that can enhance glycogen synthesis from sub-optimal amounts of CHO or energy intake are of practical interest to many athletes; in this scenario, the co-ingestion of protein with CHO can assist glycogen storage. Future research should identify other factors that enhance the rate of synthesis of glycogen storage in a limited time-frame, improve glycogen storage from a limited CHO intake or increase muscle glycogen supercompensation.

Post-exercise muscle glycogen resynthesis in humans. J Appl Physiol, 24 October 2016.

http://jap.physiology.org/content/early/2016/10/24/japplphysiol.00860.2016