Glucose Plus Fructose Ingestion For Post-Exercise Recovery—Greater Than The Sum Of Its Parts?

Discussion in 'Articles & Scientific Studies' started by paymanz, Aug 27, 2018.

  1. paymanz

    paymanz Member

    Joined:
    Jan 6, 2015
    Messages:
    2,623
    Gender:
    Male
    Nutrients. 2017 Apr; 9(4): 344.
    Published online 2017 Mar 30. doi: 10.3390/nu9040344
    PMCID: PMC5409683
    PMID: 28358334

    Glucose Plus Fructose Ingestion for Post-Exercise Recovery—Greater than the Sum of Its Parts?


    Abstract
    Carbohydrate availability in the form of muscle and liver glycogen is an important determinant of performance during prolonged bouts of moderate- to high-intensity exercise. Therefore, when effective endurance performance is an objective on multiple occasions within a 24-h period, the restoration of endogenous glycogen stores is the principal factor determining recovery. This review considers the role of glucose–fructose co-ingestion on liver and muscle glycogen repletion following prolonged exercise. Glucose and fructose are primarily absorbed by different intestinal transport proteins; by combining the ingestion of glucose with fructose, both transport pathways are utilised, which increases the total capacity for carbohydrate absorption. Moreover, the addition of glucose to fructose ingestion facilitates intestinal fructose absorption via a currently unidentified mechanism. The co-ingestion of glucose and fructose therefore provides faster rates of carbohydrate absorption than the sum of glucose and fructose absorption rates alone. Similar metabolic effects can be achieved via the ingestion of sucrose (a disaccharide of glucose and fructose) because intestinal absorption is unlikely to be limited by sucrose hydrolysis. Carbohydrate ingestion at a rate of ≥1.2 g carbohydrate per kg body mass per hour appears to maximise post-exercise muscle glycogen repletion rates. Providing these carbohydrates in the form of glucose–fructose (sucrose) mixtures does not further enhance muscle glycogen repletion rates over glucose (polymer) ingestion alone. In contrast, liver glycogen repletion rates are approximately doubled with ingestion of glucose–fructose (sucrose) mixtures over isocaloric ingestion of glucose (polymers) alone. Furthermore, glucose plus fructose (sucrose) ingestion alleviates gastrointestinal distress when the ingestion rate approaches or exceeds the capacity for intestinal glucose absorption (~1.2 g/min). Accordingly, when rapid recovery of endogenous glycogen stores is a priority, ingesting glucose–fructose mixtures (or sucrose) at a rate of ≥1.2 g·kg body mass−1·h−1 can enhance glycogen repletion rates whilst also minimising gastrointestinal distress.

    Macronutrient considerations for the sport of bodybuilding. - PubMed - NCBI

     
Loading...