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ULTIMO FASCICOLOTHE JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS

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Original articles  EXERCISE PHYSIOLOGY AND BIOMECHANICS


The Journal of Sports Medicine and Physical Fitness 2002 Settembre;42(3):282-8

lingua: Inglese

Is muscle power related to running speed with changes of direction?

Young W. B., James R., Montgomery I.

From the ­School of ­Human Move­ment and ­Sport Sci­ences, Uni­ver­sity of Bal­larat, Bal­larat, Vic­toria, Aus­tralia


PDF  ESTRATTI


Back­ground. The pur­pose of ­this ­study was to iden­tify the rela­tion­ships ­between leg ­muscle ­power and ­sprinting ­speed ­with ­changes of direc­tion.
­Methods. Experi­mental ­design: the ­study was ­designed to ­describe rela­tion­ships ­between phys­ical qual­ities and a com­po­nent of ­sports per­for­mance. Set­ting: ­testing was con­ducted in an ­indoor ­sports ­hall and a bio­me­chanics labor­a­tory. Par­tic­i­pants: 15 ­male par­tic­i­pants ­were ­required to be ­free of ­injury and ­have ­recent expe­ri­ence com­peting in ­sports ­involving ­sprints ­with ­changes of direc­tion. Meas­ures: sub­jects ­were ­timed in 8 m ­sprints in a ­straight ­line and ­with var­ious ­changes of direc­tion. ­They ­were ­also ­tested for bilat­eral and uni­lat­eral leg ­extensor ­muscle con­cen­tric ­power ­output by an iso­ki­netic ­squat and reac­tive ­strength by a ­drop ­jump.
­Results. The cor­re­la­tions ­between con­cen­tric ­power and ­straight ­sprinting ­speed ­were non-sig­nif­i­cant ­whereas the rela­tion­ships ­between reac­tive ­strength and ­straight ­speed ­were sta­tis­ti­cally sig­nif­i­cant. Cor­re­la­tions ­between ­muscle ­power and ­speed ­while ­changing direc­tion ­were gen­er­ally low and non-sig­nif­i­cant for con­cen­tric leg ­power ­with ­some mod­erate and sig­nif­i­cant (p<0.05) coef­fi­cients ­found for reac­tive ­strength. The par­tic­i­pants who ­turned ­faster to one ­side ­tended to ­have a reac­tive ­strength dom­i­nance in the leg respon­sible for the ­push-off ­action.
Con­clu­sions. The rela­tion­ships ­between leg ­muscle ­power and ­change-of-direc­tion ­speed ­were not con­sis­tent. Reac­tive ­strength as meas­ured by the ­drop ­jump ­appears to ­have ­some impor­tance for lat­eral ­change-of-direc­tion ­speed, pos­sibly ­because of sim­ilar ­push-off ­actions. It was con­cluded ­that reac­tive ­strength of the leg ­extensor mus­cles has ­some impor­tance in ­change-of-direc­tion per­for­mance but the ­other tech­nical and per­cep­tual fac­tors ­than influ­ence ­agility per­for­mance ­should ­also be con­sid­ered.

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