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The effect of higher than recommended protein feedings post-exercise on recovery following downhill running in masters triathletes
International Journal of Sport Nutrition and Exercise Metabolism (2016)
  • Thomas M Doering, Central Queensland University
  • Peter Reaburn, Central Queensland University
  • Nattai R Borges, Central Queensland University
  • Gregory R Cox, Australian Institute of Sport
  • David G Jenkins, The University of Queensland
Abstract
Following exercise-induced muscle damage (EIMD), masters athletes take longer to recover than younger athletes. The purpose of this study was to determine the effect of higher than recommended post-exercise protein feedings on the recovery of knee extensor peak isometric torque (PIT), perceptions of recovery, and cycling time trial (TT) performance following EIMD in masters triathletes. Eight masters triathletes (52±2 y, V̇O2max, 51.8±4.2 mL•kg-1•min-1) completed two trials separated by seven days in a randomised, double-blind, crossover study. Trials consisted of morning PIT testing and a 30-min downhill run followed by an eight-hour recovery. During recovery, a moderate (MPI; 0.3 g•kg-1•bolus-1) or high (0.6 g•kg-1•bolus-1) protein intake (HPI) was consumed in three bolus feedings at two hour intervals commencing immediately post-exercise. PIT testing and a 7 kJ•kg-1 cycling TT were completed post-intervention. Perceptions of recovery were assessed pre- and post-exercise. The HPI did not significantly improve recovery compared with MPI (p>0.05). However, comparison of within-treatment change shows the HPI provided a moderate beneficial effect (d=0.66), attenuating the loss of afternoon PIT (-3.6%, d=0.09) compared to the MPI (-8.6%, d=0.24). The HPI provided a large beneficial effect (d=0.83), reducing perceived fatigue over the eight-hour recovery (d=1.25) compared to the MPI (d=0.22). Despite these effects, cycling performance was unchanged (HPI=2395±297 s vs. MPI=2369±278 s;d =0.09). In conclusion, doubling the recommended post-exercise protein intake did not significantly improve recovery in masters athletes; however, HPI provided moderate to large beneficial effects on recovery that may be meaningful following EIMD.
Keywords
  • cycling performance,
  • exercise-induced muscle damage,
  • fatigue,
  • nutrition
Publication Date
August, 2016
DOI
http://dx.doi.org/10.1123/ijsnem.2016-0079
Publisher Statement
Citation only

Doering, T., Jenkins, D., Borges, N., Cox, G. & Reaburn, P. (2016, in press). The effect of higher than recommended protein feedings post-exercise on recovery following downhill running in masters triathletes. International Journal of Sport Nutrition and Exercise Metabolism. http://dx.doi.org/10.1123/ijsnem.2016-0079

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Copyright © Human Kinetics, Inc., 2016

This document has been peer reviewed.

Citation Information
Thomas M Doering, Peter Reaburn, Nattai R Borges, Gregory R Cox, et al.. "The effect of higher than recommended protein feedings post-exercise on recovery following downhill running in masters triathletes" International Journal of Sport Nutrition and Exercise Metabolism (2016) ISSN: 1526-484X
Available at: http://works.bepress.com/peter-reaburn/2/