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Elbow Flexor Strength, Muscle Size, and Moment Arms in Prepubertal Boys and Girls

Authors :
Neil Armstrong
Louise Wood
Sharon Dixon
Chris Grant
Source :
Pediatric Exercise Science. 18:457-469
Publication Year :
2006
Publisher :
Human Kinetics, 2006.

Abstract

The aim of this study was to examine elbow flexion torque, muscle cross-sectional area (CSA), and leverage in boys and girls. Thirty-eight prepubertal children (9.6 ± 0.3 years) volunteered to participate. All performed isometric flexion actions at 10°, 50°, and 90° of elbow flexion. Magnetic resonance imaging was used to assess elbow flexor (EF) muscle CSA and brachialis moment arm lengths. No significant gender differences were observed for any of the variables studied. EF CSA was directly proportional to isometric torque at 50° and 90°. CSA explained between 47% and 57% of torque variance. Moment arm estimates explained 19% of the variance in isometric torque at 90°. These baseline data contribute to our understanding of factors influencing strength variation during childhood.

Details

ISSN :
15432920 and 08998493
Volume :
18
Database :
OpenAIRE
Journal :
Pediatric Exercise Science
Accession number :
edsair.doi...........81d4e626d690d5d0740ee12a24124f87
Full Text :
https://doi.org/10.1123/pes.18.4.457