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Protein Supplementation Does Not Augment Adaptations to Endurance Exercise Training.

Kristin L Jonvik1, Kevin J M Paulussen1, Shiannah L Danen1

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Summary

Protein supplementation does not enhance endurance exercise adaptations. This study found no significant differences in whole-body oxidative capacity or performance gains between protein and placebo groups after 12 weeks of training.

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Area of Science:

  • Exercise Physiology
  • Nutritional Science
  • Sports Medicine

Background:

  • Chronic endurance exercise training improves cardiorespiratory fitness and performance.
  • The role of protein supplementation in augmenting exercise-induced adaptations is under investigation.
  • Previous research suggests potential benefits of protein intake for muscle repair and growth.

Purpose of the Study:

  • To investigate whether protein supplementation enhances adaptations to chronic endurance exercise training.
  • To assess the impact of protein intake on whole-body oxidative capacity (V˙O2max) and endurance performance.
  • To determine if post-exercise and pre-sleep protein intake offers additional benefits compared to a placebo.

Main Methods:

  • A 12-week double-blind, randomized, placebo-controlled trial involving 60 recreationally active males.
  • Participants engaged in triweekly endurance exercise training.
  • Supplementation involved either a protein (casein) or an isoenergetic carbohydrate placebo, ingested after each session and before sleep.
  • Assessments included V˙O2max, 10-km time trial performance, muscular endurance, and body composition.

Main Results:

  • Endurance exercise training significantly increased V˙O2max (11%) and improved time trial performance (14%), with no significant differences between the protein and placebo groups.
  • Muscular endurance also increased (6%) similarly in both groups.
  • While leg lean mass increased post-training, the difference between the protein and placebo groups was not statistically significant (P = 0.073).

Conclusions:

  • Protein supplementation following exercise and before sleep does not provide additional benefits for whole-body oxidative capacity or endurance performance in recreationally active young males undergoing chronic endurance training.
  • The study indicates that standard endurance training adaptations are not significantly augmented by this protein supplementation strategy.
  • Further research may explore different protein dosages, timing, or populations to fully elucidate the role of protein in endurance training adaptations.