A 2-year follow-up study on muscle size and dynamic strength in teenage tennis players

Scandinavian Journal of Medicine & Science in Sports
H KanehisaT Fukunaga

Abstract

Growth trends in the cross-sectional area of the quadriceps femoris (CSA(QF)) and its dynamic strength in 12 teenage tennis players (six boys and six girls), aged from 10.7 to 13.2 years at the onset of the study, were investigated through a 2-year follow-up survey. CSA(QF) values at the three levels (proximal, mid, and distal to the knee joint) and dynamic torques during knee extensions at three pre-set velocities (1.05, 3.14, and 5.24 rad/s) were determined year by year, i.e., three times (T1, T2, and T3), using magnetic resonance imaging and an isokinetic dynamometer, respectively. In both genders, the CSA(QF) values at the three levels tended to increase across the measurement times, with greater gains in the boys than in the girls at the levels mid and distal to the knee joint. Among these changes, only the CSA(QF) at the level proximal to the knee joint significantly increased regardless of changes in both skeletal age and body height. The ratios of torque to the sum of CSA(QF) at the three levels (T/CSA) at 3.14 and 5.24 rad/s for the boys and at 5.24 rad/s for the girls were significantly higher in T2 and T3 than T1. Further, the relative increases in torque and T/CSA values at 3.14 and 5.24 rad/s were greater in the bo...Continue Reading

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Citations

Nov 20, 2008·European Journal of Applied Physiology·Susanna Stenevi-LundgrenMagnus K Karlsson
Apr 8, 2010·European Journal of Applied Physiology·Diego Moliner-UrdialesJonatan R Ruiz
Nov 30, 2012·Medicine and Science in Sports and Exercise·Bjarne LöfgrenMagnus K Karlsson
Aug 21, 2008·Journal of Strength and Conditioning Research·Boris Ullrich, Gert-Peter Brüggemann
Feb 11, 2010·Journal of Strength and Conditioning Research·Boris UllrichGert-Peter Brüggemann
Mar 2, 2016·Journal of Sports Sciences·Gillian K MyburghRobert M Malina
Oct 30, 2007·Archives of Physical Medicine and Rehabilitation·Tishya A Wren, Jack R Engsberg
Jul 24, 2010·International Journal of Pediatrics·Susanna Stenevi-LundgrenMagnus K Karlsson
Jul 16, 2016·Perceptual and Motor Skills·Tamara KramerChris Visscher
Feb 27, 2016·Journal of Strength and Conditioning Research·Sghair ZouitaHassane Zouhal
Oct 16, 2009·Journal of Applied Biomechanics·Tishya A L Wren, Jack R Engsberg

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