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Morpho-functional response of the elbow extensor muscles to twelve-week self-perceived maximal resistance training

Lookup NU author(s): Dr Djordje Jakovljevic

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Abstract

Summary: The aim of this study was to determine morphological and functional changes of the elbow extensor muscles in response to a 12-week self-perceived maximal resistance training (MRT). Twenty-one healthy sedentary young men were engaged in elbow extensor training using isoacceleration dynamometry for 12 weeks with a frequency of five sessions per week (five sets of ten maximal voluntarily contractions, 1-min rest period between each set). Prior to, at 6 weeks and after the training, a series of cross-sectional magnetic resonance images of the upper arm were obtained and muscle volumes were calculated. Maximal and endurance strength increased (P<0.01) by 15% and 45% at 6 weeks, and by 29% and 70% after 12 weeks compared with baseline values, while fatigue rate of the elbow extensors decreased by 67%. The volume of triceps brachii increased in both arms (P<0.01) by 4% at 6 weeks, and by 8% after 12 weeks compared with baseline values (right arm - from 487.4 ± 72.8 cm3 to 505.8 ± 72.3 cm3 after 6 weeks and 525.3 ± 73.7 cm3 after 12 weeks; left arm - from 475.3 ± 79.1 cm3 to 493.2 ± 72.7 cm3 after 6 weeks and 511.3 ± 77.0 cm3 after 12 weeks). A high correlation was found between maximal muscle strength and muscle volume prior (r2 = 0.62) and after (r2 = 0.69) the training (P<0.05). A self-perceived MRT resulted in an increase in maximal and endurance strength. Morphological adaptation changes of triceps brachii as a result of 12-week specific strength training can explain only up to 26% of strength gain. © 2010 The Authors. Clinical Physiology and Functional Imaging © 2010 Scandinavian Society of Clinical Physiology and Nuclear Medicine.


Publication metadata

Author(s): Jakovljevic D; Gacesa J; Kozic D; Dragnic N; Brodie D; Grujic N

Publication type: Article

Publication status: Published

Journal: Clinical Physiology and Functional Imaging

Year: 2010

Volume: 30

Issue: 6

Pages: 413-419

Print publication date: 29/06/2010

ISSN (print): 1475-0961

ISSN (electronic): 1475-097X

Publisher: Wiley-Blackwell

URL: http://dx.doi.org/10.1111/j.1475-097X.2010.00957.x

DOI: 10.1111/j.1475-097X.2010.00957.x


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