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Protein feeding and exercise recovery

Witard, Oliver Charles (2009)
Ph.D. thesis, University of Birmingham.

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Abstract

The importance of protein feeding for maximising the anabolic effect of resistance exercise is well established. Ingestion of amino acids or intact protein sources with and without carbohydrate during exercise recovery further stimulates muscle protein synthesis. Less clear is the impact of an acute bout of resistance exercise on the protein synthetic rate of muscle already stimulated by food intake. This thesis demonstrates that an acute bout of resistance exercise further augments the protein synthetic rate of muscle already stimulated by food intake. Simulating everyday practice, whereby resistance exercise is typically performed in the fed state, an exercise-induced elevation in muscle protein synthesis was accompanied by an increased phosphorylation status of signaling proteins downstream of mammalian target of rapamycin (mTOR). Recent studies advocate the potential role for protein feeding in improving subsequent performance following acute bouts of fatiguing endurance-type exercise. However, previous studies have focussed upon carbohydrate nutrition, rather than examining the role of protein feeding for exercise recovery in the context of an intense period of endurance training. Increasing dietary protein intake partially countered the blunted minimal mobilisation of antiviral lymphocytes during exercise following intensified training. In addition, the number of negative symptoms of psychological stress experienced following intensified training was attenuated with additional dietary protein intake. The mechanism(s) underpinning the suggestion that a high protein diet may potentiate a better maintainence of endurance performance following intensified training could not be definitively elucidated from our experimental design. The most likely explanation appears to be related to psychological status.

Type of Work:Ph.D. thesis.
Supervisor(s):Tipton, Kevin
School/Faculty:Colleges (2008 onwards) > College of Life & Environmental Sciences
Department:School of Sport and Exercise Sciences, Human Performance Laboratory
Subjects:RC1200 Sports Medicine
Institution:University of Birmingham
ID Code:508
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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