Upper limb muscle-bone asymmetries and bone adaptation in elite youth tennis players.

IRELAND, Alex, MADEN-WILKINSON, Tom, MCPHEE, Jamie, COOKE, Karl, NARICI, Marco, DEGENS, Hans and RITTWEGER, Jörn (2013). Upper limb muscle-bone asymmetries and bone adaptation in elite youth tennis players. Medicine and Science in Sports and Exercise, 45 (9), 1749-58.

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Abstract

INTRODUCTION The study of tennis players allows the nonracket arm to act as an internal control for the exercising racket arm. In addition, the study of the upper limbs removes the influence of gravitational loading, allowing the examination of the influence of muscular force on bone adaptation. METHODS The role of muscular action on bone, strength parameters of the radius, ulna (both at 4% and 60% distal-proximal ulnar length), and humerus (at 35% distal-proximal humerus length) as well as muscle size in both arms of 50 elite junior tennis players (mean ± SD age = 13.5 ± 1.9 yr) were measured with peripheral quantitative computed tomography (pQCT). RESULTS Strong relationships were found between muscle size and bone size in both arms (all correlations, P < 0.001, R = 0.73-0.86). However, the muscle-bone ratio was significantly lower (P < 0.001) in the upper arm on the racket side (compared with the contralateral arm). In addition, material eccentricity analysis revealed that bone strength in bending and torsion increased more than strength in compression as the moment arms for these actions (bone length and width, respectively) increased (in all cases, P > 0.001, R = 0.06-0.7) with relationships being stronger in torsion than in bending. Large side differences were found in bone strength parameters and muscle size in all investigated sites, with differences in distal radius total BMC (+37% ± 21%) and humerus cortical cross-sectional area (+40% ± 12%) being most pronounced (both P < 0.001). CONCLUSIONS These results support a strong influence of muscular action on bone adaptation; however, interarm muscle-bone asymmetries suggest factors other than local muscle size that determine bone strength. The results also suggest that torsional loads provide the greatest stress experienced by the bone during a tennis stroke.

Item Type:	Article
Research Institute, Centre or Group - Does NOT include content added after October 2018:	Centre for Sport and Exercise Science
Identification Number:	https://doi.org/10.1249/MSS.0b013e31828f882f.
Page Range:	1749-58
Depositing User:	Tom Maden-Wilkinson
Date Deposited:	17 Jan 2018 11:30
Last Modified:	18 Mar 2021 16:31
URI:	https://shura.shu.ac.uk/id/eprint/17534

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