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Short-term training for explosive strength causes neural and mechanical adaptations.
MedLine Citation:
PMID:  22308164     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The current study investigated the neural and peripheral adaptations to short-term training for explosive force production. Ten males trained the knee extensors with unilateral explosive isometric contractions (1-s 'fast and hard') for 4 weeks. Before and after training, force was recorded at 50-ms intervals from force onset (F(50), F(100), F(150)) during both voluntary and involuntary (supramaximal evoked octet: 8 pulses at 300 Hz) explosive isometric contractions. Neural drive during the explosive voluntary contractions was measured with the ratio of voluntary/octet force, and average EMG normalized to M(max) of the three superficial quadriceps. Maximal voluntary force (MVF) was also measured, and ultrasonic images of the vastus lateralis were recorded during ramped contractions to assess muscle-tendon unit (MTU) stiffness between 50-90% MVF. There was an increase in voluntary F(50) (+54%), F(100) (+15%) and F(150) (+14%), and octet F(50) (+7%) and F(100) (+10%). Voluntary F(100) and F(150), and octet F(50) and F(100) increased proportionally with MVF (+11%). However, the increase in voluntary F(50) was +37% even after normalisation to MVF, and coincided with a 42% increase in both voluntary/octet force and agonist-normalised EMG over the first 50-ms. MTU stiffness between 50-90% MVF also increased. Enhanced agonist neural drive and MVF accounted for improved explosive voluntary force production in the early and late phases of the contraction, respectively. The increases in explosive octet force and MTU stiffness provide novel evidence of peripheral adaptations within just four weeks of training for explosive force production.
Authors:
Neale A Tillin; Matthew T G Pain; Jonathan P Folland
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-2-3
Journal Detail:
Title:  Experimental physiology     Volume:  -     ISSN:  1469-445X     ISO Abbreviation:  -     Publication Date:  2012 Feb 
Date Detail:
Created Date:  2012-2-6     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9002940     Medline TA:  Exp Physiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
1 University of Roehampton;
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