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Postexercise High-Fat Feeding Supresses p70S6K1 Activity in Human Skeletal Muscle.

Hammond, KM, Impey, SG, Currell, K, Mitchell, N, Shepherd, SO, Jeromson, S, Hawley, JA, Close, GL, Hamilton, DL, Sharples, AP and Morton, JP (2016) Postexercise High-Fat Feeding Supresses p70S6K1 Activity in Human Skeletal Muscle. Medicine and Science in Sports and Exercise. ISSN 1530-0315

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Abstract

PURPOSE: To examine the effects of reduced CHO but high post-exercise fat availability on cell signalling and expression of genes with putative roles in regulation of mitochondrial biogenesis, lipid metabolism and muscle protein synthesis (MPS). METHODS: Ten males completed a twice per day exercise model (3.5 h between sessions) comprising morning high-intensity interval (HIT) (8 x 5-min at 85% VO2peak) and afternoon steady-state (SS) running (60 min at 70% VO2peak). In a repeated measures design, runners exercised under different isoenergetic dietary conditions consisting of high CHO (HCHO: 10 CHO, 2.5 Protein and 0.8 Fat g.kg per whole trial period) or reduced CHO but high fat availability in the post-exercise recovery periods (HFAT: 2.5 CHO, 2.5 Protein and 3.5 Fat g.kg per whole trial period). RESULTS: Muscle glycogen was lower (P<0.05) at 3 (251 vs 301 mmol.kgdw) and 15 h (182 vs 312 mmol.kgdw) post-SS exercise in HFAT compared to HCHO. AMPK-α2 activity was not increased post-SS in either condition (P=0.41) though comparable increases (all P<0.05) in PGC-1α, p53, CS, Tfam, PPAR and ERRα mRNA were observed in HCHO and HFAT. In contrast, PDK4 (P=0.003), CD36 (P=0.05) and CPT1 (P=0.03) mRNA were greater in HFAT in the recovery period from SS exercise compared with HCHO. p70S6K activity was higher (P=0.08) at 3 h post-SS exercise in HCHO versus HFAT (72.7 ± 51.9 vs 44.7 ± 27 fmol.min mg). CONCLUSION: Post-exercise high fat feeding does not augment mRNA expression of genes associated with regulatory roles in mitochondrial biogenesis though it does increase lipid gene expression. However, post-exercise p70S6K1 activity is reduced under conditions of high fat feeding thus potentially impairing skeletal muscle remodelling processes.

Item Type: Article
Additional Information: This is a non-final version of an article published in final form in Hammond, Kelly M; Impey, Samuel G; Currell, Kevin; Mitchell, Nigel; Shepherd, Sam O; Jeromson, Stewart; Hawley, John A; Close, Graeme L; Hamilton, D. Lee; Sharples, Adam P; Morton, James P. Postexercise High-Fat Feeding Supresses p70S6K1 Activity in Human Skeletal Muscle. Medicine and Science in Sports and Exercise. (C) 2016 American College of Sports Medicine
Uncontrolled Keywords: 1106 Human Movement And Sports Science
Subjects: R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Sport & Exercise Sciences
Publisher: American College of Sports Medicine
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Date Deposited: 21 Jul 2016 12:11
Last Modified: 09 Sep 2017 06:04
DOI or Identification number: 10.1249/MSS.0000000000001009
URI: http://researchonline.ljmu.ac.uk/id/eprint/3924

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