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ULTIMO FASCICOLOTHE JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS

Rivista di Medicina, Traumatologia e Psicologia dello Sport

Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111

Periodicità: Mensile

ISSN 0022-4707

Online ISSN 1827-1928

 

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

EXERCISE PHYSIOLOGY AND BIOMECHANICS 

 Original articles

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

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.

lingua: Inglese


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