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Title: Muscle hypertrophy in prepubescent tennis players: A segmentation MRI study
Authors: Sanchis-Moysi, Joaquin 
Idoate, Fernando
Serrano-Sanchez, Jose A. 
Dorado, Cecilia 
Calbet, Jose A L 
UNESCO Clasification: 241106 Fisiología del ejercicio
Keywords: Spastic Cerebral-Palsy
Upper Extremity
Backhand Strokes
Elbow Function
Strength, et al
Issue Date: 2012
Journal: PLoS ONE 
Abstract: Purpose: To asses if tennis at prepubertal age elicits the hypertrophy of dominant arm muscles.Methods: The volume of the muscles of both arms was determined using magnetic resonance imaging (MRI) in 7 male prepubertal tennis players (TP) and 7 non-active control subjects (CG) (mean age 11.0 +/- 0.8 years, Tanner 1-2).Results: TP had 13% greater total muscle volume in the dominant than in the contralateral arm. The magnitude of inter-arm asymmetry was greater in TP than in CG (13 vs 3%, P<0.001). The dominant arm of TP was 16% greater than the dominant arm of CG (P<0.01), whilst non-dominant arms had similar total muscle volumes in both groups (P = 0.25), after accounting for height as covariate. In TP, dominant deltoid (11%), forearm supinator (55%) and forearm flexors (21%) and extensors (25%) were hypertrophied compared to the contralateral arm (P<0.05). In CG, the dominant supinator muscle was bigger than its contralateral homonimous (63%, P<0.05).Conclusions: Tennis at prepubertal age is associated with marked hypertrophy of the dominant arm, leading to a marked level of asymmetry (+13%), much greater than observed in non-active controls (+3%). Therefore, tennis particpation at prepubertal age is associated with increased muscle volumes in dominant compared to the non-dominant arm, likely due to selectively hypertrophy of the loaded muscles.
ISSN: 1932-6203
DOI: 10.1371/journal.pone.0033622
Source: PLoS ONE [ISSN 1932-6203],v. 7(3), e33622
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