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Original articles  EXERCISE PHYSIOLOGY AND BIOMECHANICS


The Journal of Sports Medicine and Physical Fitness 2004 Giugno;44(2):126-31

lingua: Inglese

Snatch lift kinematics and bar energetics in male adolescent and adult weightlifters

Gourgoulis V., Aggeloussis N., Kalivas V., Antoniou P., Mavromatis G.

Depart­ment of Phys­ical Edu­ca­tion and ­Sport Sci­ence Democ­ritus Uni­ver­sity of ­Thrace, Kom­o­tini, ­Grece


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Aim. The aim of the ­present ­study was compare ­linear kin­e­matics and ­energy ­changes of the bar­bell, ­along ­with the ­angular kin­e­matics of the leg move­ment ­during the ­snatch tech­nique, ­between ­male ado­les­cent and ­adult weight­lifters.
­Methods. Two S-VHS cam­eras oper­ating at 60 ­fields per ­second ­recorded the ­heaviest ­lifts of 14 ­male ado­les­cent and 9 ­adult top-­level weight­lifters ­under com­pet­i­tive con­di­tions. The spa­tial co-ordi­nates of ­selected ­points on the ­body and the bar­bell ­were cal­cu­lated ­using the ­direct ­linear trans­for­ma­tion pro­ce­dure. A low ­pass dig­ital ­filter ­with 4 Hz cut-off fre­quency was ­used for the ­smoothing of raw co-ordi­nate ­data. The “t”-test for inde­pen­dent sam­ples was ­used for the sta­tis­tical treat­ment of data.
­Results. The ­results ­revealed ­that ­there ­were no sig­nif­i­cant dif­fer­ences ­between the ado­les­cent and the ­adult weight­lifters in the ­majority of the kin­e­matic var­i­ables. How­ever, ado­les­cent weight­lifters ­extended ­their ­knees sig­nif­i­cantly ­slower (t21=4.211, p<0.05) ­during the 1st ­pull and ­their ­ankles ­during the 2nd ­pull (t21=2.440, p<0.05) ­than the ­adult weight­lifters did. More­over, the ­average rel­a­tive ­power ­output was sig­nif­i­cantly ­greater for the ­adult weight­lifters ­during ­both the 1st (t21=2.303, p<0.05) and the snd ­pull (t21=2.611, p<0.05).
Con­clu­sion. ­These ­results indi­cate ­that the ado­les­cent weight­lifters ­were char­ac­ter­ised ­from a ­high ­level of ­snatch tech­nique and dif­fer­en­tiated ­from the ­adults pre­dom­i­nantly at the ­less pow­erful exe­cu­tion of the move­ment.

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