Acute molecular responses to concurrent resistance and high-intensity interval exercise in untrained skeletal muscle

Pugh, J.K., Faulkner, S.H. ORCID: 0000-0003-4688-7252, Jackson, A.P., King, J.A. and Nimmo, M.A., 2015. Acute molecular responses to concurrent resistance and high-intensity interval exercise in untrained skeletal muscle. Physiological Reports, 3, e12364. ISSN 2051-817X

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Abstract

Concurrent training involving resistance and endurance exercise may augment the benefits of single-mode training for the purpose of improving health. However, muscle adaptations, associated with resistance exercise, may be blunted by a subsequent bout of endurance exercise, via molecular interference. High-intensity interval training (HIIT), generating similar adaptations to endurance exercise, may offer an alternative exercise mode to traditional endurance exercise. This study examined the influence of an acute HIIT session on the molecular responses following resistance exercise in untrained skeletal muscle. Ten male participants performed resistance exercise (4 9 8 leg extensions, 70% 1RM, (RE)) or RE followed by HIIT (10 x 1 min at 90% HRmax, (RE+HIIT)). Muscle biopsies were collected from the vastus lateralis before, 2 and 6 h post-RE to determine intramuscular protein phosphorylation and mRNA responses. Phosphorylation of Akt (Ser473) decreased at 6 h in both trials (P < 0.05). Phosphorylation of mTOR (Ser2448) was higher in RE+HIIT (P < 0.05). All PGC-1a mRNA variants increased at 2 h in RE+HIIT with PGC-1a and PGC-1a-ex1b remaining elevated at 6 h, whereas RE-induced increases at 2 and 6 h for PGC-1a-ex1b only (P < 0.05). Myostatin expression decreased at 2 and 6 h in both trials (P < 0.05). MuRF-1 was elevated in RE+HIIT versus RE at 2 and 6 h (P < 0.05). Atrogin-1 was lower at 2 h, with FOXO3A downregulated at 6 h (P < 0.05). These data do not support the existence of an acute interference effect on protein signaling and mRNA expression, and suggest that HIIT may be an alternative to endurance exercise when performed after resistance exercise in the same training session to optimize adaptations.

Item Type:	Journal article
Publication Title:	Physiological Reports
Creators:	Pugh, J.K., Faulkner, S.H., Jackson, A.P., King, J.A. and Nimmo, M.A.
Publisher:	John Wiley
Date:	22 April 2015
Volume:	3
ISSN:	2051-817X
Identifiers:	Number Type 10.14814/phy2.12364 DOI
Divisions:	Schools > School of Science and Technology
Record created by:	Jonathan Gallacher
Date Added:	18 Aug 2017 12:09
Last Modified:	18 Aug 2017 12:09
URI:	https://irep.ntu.ac.uk/id/eprint/31431

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