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The contribution of muscle hypertrophy to strength changes following resistance training.
- Source :
-
European journal of applied physiology [Eur J Appl Physiol] 2014 Jun; Vol. 114 (6), pp. 1239-49. Date of Electronic Publication: 2014 Mar 09. - Publication Year :
- 2014
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Abstract
- Purpose: 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.<br />Methods: 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.<br />Results: 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).<br />Conclusions: 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.
Details
- Language :
- English
- ISSN :
- 1439-6327
- Volume :
- 114
- Issue :
- 6
- Database :
- MEDLINE
- Journal :
- European journal of applied physiology
- Publication Type :
- Academic Journal
- Accession number :
- 24610245
- Full Text :
- https://doi.org/10.1007/s00421-014-2855-4