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Original articles  

The Journal of Sports Medicine and Physical Fitness 2001 September;41(3):354-62

language: English

Knee extension strenght and vertical jumping performance in nordic combined athletes

Pääsuke M., Ereline J., Gapeyeva H.

From the Insti­tute of Exer­cise Biol­o­gy Uni­ver­sity of Tar­tu, Tar­tu, Esto­nia


Back­ground. The pur­pose of ­this ­study was to meas­ure ­knee exten­sion ­strength and ver­ti­cal jump­ing per­for­mance char­ac­ter­is­tics in nor­dic com­bined ath­letes.
Meth­ods. Uni­lat­er­al ­knee exten­sion iso­met­ric max­i­mal ­force (MF) and ­rate of ­force devel­op­ment (RFD) ­were meas­ured by a spe­cial dyna­mom­e­ter, and uni­lat­er­al iso­ki­net­ic ­peak ­torque (PT) at angu­lar veloc­ities of 60 and 180 deg/sec by a Cyb­ex II dyna­mom­e­ter. Max­i­mal ­squat (SJ) and coun­ter-move­ment jumps (CMJ) ­were per­formed on ­force plat­form. ­Nine nor­dic com­bined ath­letes as the experi­men­tal ­group and 12 ­untrained ­male uni­ver­sity stu­dents as the con­trol ­group par­tic­i­pat­ed.
­Results. Nor­dic com­bined ath­letes had a great­er (p<0.05) abso­lute and rel­a­tive (­body ­mass-relat­ed) val­ues of ­knee exten­sion iso­met­ric MF and iso­ki­net­ic PT, iso­met­ric RFD as ­well as jump­ing ­height in SJ and CMJ, ­than con­trols. The jump­ing ­height in CMJ was great­er (p<0.05) com­pared ­with SJ ­only in nor­dic com­bined ath­letes. Jump­ing ­height in SJ and CMJ cor­re­lat­ed sig­nif­i­cant­ly (p<0.05) ­with ­knee exten­sion iso­met­ric RFD (r=0.62-0.83) and iso­ki­net­ic PT at angu­lar veloc­ity of 60 deg/sec (r=0.70-0.82) in nor­dic com­bined ath­letes and ­untrained men. No sig­nif­i­cant cor­re­la­tion was ­obtained ­between uni­lat­er­al ­knee exten­sion iso­met­ric MF and iso­ki­net­ic PT or ver­ti­cal jump­ing ­height.
Con­clu­sions. The ­present ­study dem­on­strat­ed a mark­ed­ly high­er vol­un­tary max­i­mal and explo­sive ­force-gen­er­at­ing capac­ity of the exten­sor mus­cles of low­er extrem­ities in nor­dic com­bined ath­letes com­pared ­with ­untrained men, ­which indi­cates the adap­ta­tion to spe­cif­ic explo­sive ­type of ­strength train­ing.

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