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The contribution of muscle hypertrophy to strength changes following resistance training

Erskine, RM, Fletcher, G and Folland, JP (2014) The contribution of muscle hypertrophy to strength changes following resistance training. EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY, 114 (6). pp. 1239-1249. ISSN 1439-6319

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Whilst skeletal muscle hypertrophy is considered an important adaptation to resistance training (RT), it has not previously been found to explain the inter-individual changes in strength after RT. This study investigated the contribution of hypertrophy to individual gains in isometric, isoinertial and explosive strength after 12 weeks of elbow flexor RT.
Thirty-three previously untrained, healthy men (18–30 years) completed an initial 3-week period of elbow flexor RT (to facilitate neurological responses) followed by 6-week no training, and then 12-week elbow flexor RT. Unilateral elbow flexor muscle strength [isometric maximum voluntary force (iMVF), single repetition maximum (1-RM) and explosive force], muscle volume (V m), muscle fascicle pennation angle (θ p) and normalized agonist, antagonist and stabilizer sEMG were assessed pre and post 12-week RT.
Percentage gains in V m correlated with percentage changes in iMVF (r = 0.527; P = 0.002) and 1-RM (r = 0.482; P = 0.005) but not in explosive force (r ≤ 0.243; P ≥ 0.175). Percentage changes in iMVF, 1-RM, and explosive force did not correlate with percentage changes in agonist, antagonist or stabilizer sEMG (all P > 0.05). Percentage gains in θ p inversely correlated with percentage changes in normalized explosive force at 150 ms after force onset (r = 0.362; P = 0.038).
We have shown for the first time that muscle hypertrophy explains a significant proportion of the inter-individual variability in isometric and isoinertial strength gains following 12-week elbow flexor RT in healthy young men.

Item Type: Article
Additional Information: The final publication is available at Springer via http://dx.doi.org/10.1007/s00421-014-2855-4
Uncontrolled Keywords: 1106 Human Movement And Sports Science
Subjects: R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Sport & Exercise Sciences
Publisher: SPRINGER
Related URLs:
Date Deposited: 26 Feb 2016 09:00
Last Modified: 07 Sep 2017 13:13
DOI or Identification number: 10.1007/s00421-014-2855-4
URI: http://researchonline.ljmu.ac.uk/id/eprint/2992

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