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Pre-exercise Carbohydrate Drink Adding Protein Improves Post-exercise Fatigue Recovery.

Albert Yi-Wey Tan1, Sareena-Hanim Hamzah1, Chih-Yang Huang2,3,4,5,6

  • 1Centre for Sport and Exercise Sciences, University of Malaya, Kuala Lumpur, Malaysia.

Frontiers in Physiology
|December 9, 2021
PubMed
Summary

Adding protein to carbohydrate drinks enhances next-day fatigue recovery for endurance athletes, with soy protein showing similar benefits to whey protein. This highlights the importance of dietary nitrogen for post-exercise recovery.

Keywords:
FRAPGSHGSSGferric reducing antioxidant powerfree radical scavenging capacityplant-based proteinreduced-to-oxidized glutathionesoy

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Area of Science:

  • Sports Science
  • Nutrition Science
  • Exercise Physiology

Background:

  • Optimal fueling strategies are crucial for endurance athletes.
  • The role of protein in carbohydrate drinks for performance and recovery is debated.
  • Understanding post-exercise recovery mechanisms is key for training adaptation.

Purpose of the Study:

  • To evaluate the impact of protein inclusion in carbohydrate drinks on high-intensity endurance performance.
  • To assess the effect of protein on post-exercise fatigue recovery over consecutive days.
  • To compare the efficacy of different protein sources (whey vs. soy) in recovery.

Main Methods:

  • Young men performed cycling time-to-exhaustion tests over two days.
  • Participants consumed isocaloric carbohydrate drinks with varying protein content (1.8g, 4.8g, 9.2g).
  • Biomarkers of inflammation (IL-6) and muscle damage (creatine kinase) were measured, alongside antioxidant capacity (FRAP).

Main Results:

  • No significant differences in immediate endurance performance or antioxidant capacity were observed across conditions.
  • Significant improvements in next-day cycling performance and total work were noted with higher protein intakes (whey and soy).
  • Plasma IL-6 increased post-exercise, while creatine kinase and FRAP levels remained largely unchanged.

Conclusions:

  • Protein supplementation in carbohydrate drinks does not enhance immediate endurance performance but aids subsequent-day fatigue recovery.
  • Soy protein demonstrates comparable fatigue recovery benefits to whey protein, even with lower protein content.
  • Dietary nitrogen sources play a significant role in modulating exercise-induced fatigue and recovery.