Premium
Lack of human muscle architectural adaptation after short‐term strength training
Author(s) -
Blazevich Anthony J.,
Gill Nicholas D.,
Deans Nathan,
Zhou Shi
Publication year - 2007
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/mus.20666
Subject(s) - muscle architecture , fascicle , concentric , physical medicine and rehabilitation , eccentric , eccentric training , medicine , strength training , anatomy , muscle strength , physical therapy , mathematics , physics , geometry , quantum mechanics
The mechanisms governing the increases in force production in response to short periods of strength training have yet to be fully elucidated. We examined whether muscle architectural adaptation was a contributing factor. Ultrasound imaging techniques were used to measure quadriceps muscle architecture at 17 sites in vivo in trained and untrained legs of men and women after 2.5 and 5 weeks of unilateral knee extension training, as well as in a nontraining control group. Despite increases in knee extensor strength of the trained and untrained (women only) legs, there were no changes in muscle thickness, fascicle angle, or fascicle length in any of the muscles tested. The moderate correlation between vastus lateralis thickness (middle site) and eccentric ( r = 0.55; P < 0.05) and concentric ( r = 0.46; P < 0.1) torque after, but not before, training is suggestive of neural rather than architectural adaptations predominating in the early phase of training. Muscle Nerve, 2006