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Original articles  EXERCISE PHYSIOLOGY AND BIOMECHANICS


The Journal of Sports Medicine and Physical Fitness 2003 December;43(4):444-52

Copyright © 2009 EDIZIONI MINERVA MEDICA

lingua: Inglese

Isokinetic peak torque and hamstring/quadriceps ratios in young basketball players. Effects of age, velocity, and contraction mode

Gerodimos V., Mandou V., Zafeiridis A., Ioakimidis P., Stavropoulos N., Kellis S.

Department of Physical Education and Sport Science, Sports Performance and Coaching Laboratory, Aristotelio University of Thessaloniki, Thessaloniki, Greece


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Aim. The pur­pose of ­this ­study was to pro­vide an exten­sive iso­ki­netic pro­file, ­including ­peak ­torque and “func­tional” and “con­ven­tional” ­muscle ­group ­ratios, of bas­ket­ball ­players ­throughout the devel­op­mental ­years 12-17. Fur­ther­more, we inves­ti­gated the ­effects of age and ­angular ­velocity on ­peak ­torque and recip­rocal ­muscle ­group ­ratios, and ­observed the ­force-­velocity pat­tern.
­Methods. Bas­ket­ball ­players (n=180) 12 to 17 years. ­were ­divided ­according to ­their age in 6 ­equal (n=30) ­groups ­aged 12, 13, 14, 15, 16, 17 ­years. All sub­jects per­formed max­imum ­knee exten­sion and ­flexion ­efforts at 60o/s and 180o/s ­angular veloc­ities ­under eccen­tric and con­cen­tric con­di­tions. The abso­lute (Nm) ­peak ­torque was meas­ured, and the rel­a­tive ­peak ­torque (PT/BW) and “func­tional” and “con­ven­tional” recip­rocal ­muscle ­group ­ratio (%) ­were cal­cu­lated.
­Results. PT/BW ­values of ­knee ­flexors ­ranged ­from 0.98 to 2.29 Nm/kg and of exten­sors ­from 1.53 to 3.69 Nm/kg, ­across all age, ­velocity, and ­muscle ­action ­levels. PT/BW was ­higher at ­slow ­speed and ­during eccen­tric con­trac­tion irre­spec­tive of age and ­angular ­velocity/­muscle ­action. The ­results indi­cated a sig­nif­i­cant (p<0.05) age-­related ­increase in ­peak ­torque inde­pen­dent of ­changes in BW. The ­force-­velocity pat­terns ­were sim­ilar ­across ­ages. The “func­tional” and “con­ven­tional” ­ratios ­were not ­affected by age, but ­increased ­with ­increase in ­angular ­velocity, ­except the ­CONKF/ECCKE ­ratio ­that was ­higher (p<0.05) at ­slow ­speed.
Con­clu­sion. The ­present ­study pro­vides an exten­sive iso­ki­netic pro­file of a ­knee ­joint in bas­ket­ball ­players ­throughout devel­op­mental ­years 12-17. ­Coaches and phys­ical ther­a­pist may use ­these infor­ma­tion ­when eval­u­ating and plan­ning exer­cise pro­grams ­during ­training and reha­bil­i­ta­tion.

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