Nutrition and resistance exercise during reconditioning from unloading.

Academic Article


  • INTRODUCTION: The recovery of muscle size and function following musculoskeletal unloading has received little attention in the scientific literature. Nutritional factors such as total energy, protein intake, and the pre- and/or post-exercise consumption of amino acid-carbohydrate (AACHO) have been shown to be important for enhancing training adaptations in recreational exercisers. PURPOSE: A preliminary study was conducted to explore the interaction between nutrition and resistance exercise during reconditioning from unloading. METHODS: Muscle CSA, strength, and endurance were measured during a control period following 30 d of unilateral lower limb suspension (Post-ULLS) and after 18 d of reconditioning (ReCon). Six participants consumed either AACHO (979 kJ, 36 g carbohydrate, 22.5 g protein) or placebo (PLAC) prior to resistance exercise (3 d x wk(-1)) during reconditioning. Total daily energy and macronutrient intake were evaluated from dietary journals. RESULTS: From Post-ULLS to ReCon, muscle endurance increased 1.1 +/- 0.6 min in AACHO and decreased 1.3 +/- 0.7 min in PLAC. Muscle CSA (6 +/- 2 vs. 5 +/- 3 cm2) and strength (105 +/- 53 vs. 81 +/- 37 N) increased similarly in AACHO and PLAC, respectively. When groups were pooled there was a significant correlation between daily protein intake and the recovery of muscle CSA (r = 0.81). DISCUSSION: Although our findings are preliminary, timing AACHO intake during reconditioning was beneficial for muscular endurance, while overall protein intake was associated with increased muscle size. A systematic evaluation into the synergistic relationship between nutrition and exercise during muscular recovery from prolonged unloading is warranted.
  • Authors

  • Hackney, Kyle J
  • Cook, Summer
  • Ploutz-Snyder, Lori L
  • Status

    Publication Date

  • August 2011
  • Keywords

  • Diet
  • Exercise
  • Female
  • Hindlimb Suspension
  • Humans
  • Male
  • Muscle Strength
  • Muscle, Skeletal
  • Nutritional Requirements
  • Physical Endurance
  • Young Adult
  • Digital Object Identifier (doi)

    Pubmed Id

  • 21853859
  • Start Page

  • 805
  • End Page

  • 809
  • Volume

  • 82
  • Issue

  • 8