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Clin Exp Pharmacol Physiol. 2014 Aug;41(8):608-13. doi: 10.1111/1440-1681.12246.

Ramping up the signal: promoting endurance training adaptation in skeletal muscle by nutritional manipulation.

Author information

1
Exercise & Nutrition Research Group, School of Exercise Sciences, Australian Catholic University, Melbourne, Vic., Australia; Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK.

Abstract

Mitochondrial biogenesis in skeletal muscle results from the cumulative effect of transient increases in mRNA transcripts encoding mitochondrial proteins in response to repeated exercise sessions. This process requires the coordinated expression of both nuclear and mitochondrial (mt) DNA genomes and is regulated, for the most part, by the peroxisome proliferator-activated receptor γ coactivator 1α. Several other exercise-inducible proteins also play important roles in promoting an endurance phenotype, including AMP-activated protein kinase, p38 mitogen-activated protein kinase and tumour suppressor protein p53. Commencing endurance-based exercise with low muscle glycogen availability results in greater activation of many of these signalling proteins compared with when the same exercise is undertaken with normal glycogen concentration, suggesting that nutrient availability is a potent signal that can modulate the acute cellular responses to a single bout of exercise. When exercise sessions are repeated in the face of low glycogen availability (i.e. chronic training), the phenotypic adaptations resulting from such interventions are also augmented.

KEYWORDS:

AMP-activated protein kinase; gene expression; mitochondria; mitochondrial biogenesis; training adaptation

PMID:
25142094
DOI:
10.1111/1440-1681.12246
[Indexed for MEDLINE]

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