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Original articles  EXERCISE PHYSIOLOGY AND BIOMECHANICS


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

Copyright © 2009 EDIZIONI MINERVA MEDICA

language: English

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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