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The Journal of Sports Medicine and Physical Fitness 2000 December;40(4):312-8

Copyright © 2001 EDIZIONI MINERVA MEDICA

lingua: Inglese

Differences in muscle cross-sectional area and strength between elite senior and college Olympic weight lifters

Funato K., Kanehisa H., Fukunaga T.

Department of Life Sciences (Sports Sciences), University of Tokyo, Tokyo, Japan


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Background. The pur­pose of ­this ­study was to inves­ti­gate the pro­files of mus­cle ­cross-sec­tion­al ­area (CSA) and ­strength capa­bil­ity in rela­tion to lift­ing abil­ity in Olympic ­weight lift­ers.
Methods. The sub­jects ­were 8 ­elite sen­ior lift­ers (ESL, age=25.2±1.3 ­years, ­height=1.64±0.03 m, ­mass=68.6±4.2 kg, mean±SEM) and 9 col­lege lift­ers (CL, 20.8±0.3 ­years, 1.67±0.03 m, 70.53.4 kg) ­whose pre­de­ter­mined ­weight class­es ­were with­in the ­same ­range. The CSAs of ­elbow or ­knee exten­sor and ­elbow or ­knee flex­or mus­cles ­were meas­ured ­using a B-­mode ultra­sound appa­ra­tus. Concentric and eccen­tric max­i­mal vol­un­tary forc­es ­were deter­mined ­with an iso­ki­net­ic dyna­mom­e­ter at a con­stant veloc­ity of 1.05 rad/sec.
Results. The ­best ­score of the ­total ­mass lift­ed in the ­snatch and the ­clean and ­jerk ­lifts was sig­nif­i­cant­ly high­er in ESL ­than in CL ­even in ­terms of per ­unit of fat-­free ­mass. There ­were no sig­nif­i­cant dif­fer­enc­es ­between the two ­groups in fat-­free ­mass, mus­cle CSA and ­force val­ues ­with the excep­tion ­that ESL com­pared to CL ­showed sig­nif­i­cant­ly great­er ­force in con­cen­tric ­knee flex­ion. However, the ­ratios of ­force to mus­cle CSA (F/CSAs) in con­cen­tric and eccen­tric ­elbow exten­sions, eccen­tric ­knee exten­sion and con­cen­tric ­knee flex­ion ­were sig­nif­i­cant­ly high­er in ESL ­than in CL.
Conclusions. The ­present ­results indi­cat­ed ­that the mag­ni­tude of mus­cu­lar devel­op­ment in ­limbs was sim­i­lar in ­elite sen­ior and col­lege lift­ers ­whose pre­de­ter­mined ­weight class­es ­were with­in the ­same ­range. As com­pared to col­lege lift­ers, how­ev­er, ­elite sen­ior lift­ers had a high­er F/CSA in spe­cif­ic mus­cle ­action ­modes, ­which ­might ­relate to the opti­mal exe­cu­tion of the Olympic ­lifts.

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