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Original articles  EXERCISE PHYSIOLOGY AND BIOMECHANICS


The Journal of Sports Medicine and Physical Fitness 2003 December;43(4):453-8

Copyright © 2009 EDIZIONI MINERVA MEDICA

lingua: Inglese

Age-related differences in knee extension rate of isometric force development and vertical jumping performance in women

Pääsuke M., Ereline J., Gapeyeva H.

Institute of Exercise Biology and Physiotherapy, University of Tartu, Tartu, Estonia


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Aim. The pur­pose of ­this ­study was to com­pare ­knee exten­sion ­rate of iso­metric ­force devel­op­ment and ver­tical ­jumping per­for­mance char­ac­ter­is­tics in ­young, ­middle-­aged and eld­erly ­women.
­Methods. Uni­lat­eral ­knee exten­sion max­imal ­rate of iso­metric ­force devel­op­ment (RFD) was meas­ured by a dyna­mom­eter. Max­imal ­squat (SJ) and ­counter-move­ment ­jumps (CMJ) ­were per­formed on a ­force plat­form. ­Twelve ­young (21- to 24-year-old), 12 ­middle-­aged (50- to 58-year-old) and 13 eld­erly (70- to 76-year-old) ­women par­tic­i­pated.
­Results. ­Young ­women had ­greater (p<0.05) max­imal iso­metric RFD as com­pared to ­older ­groups. No sig­nif­i­cant dif­fer­ences in max­imal iso­metric RFD ­between ­middle-­aged and eld­erly ­women ­have ­been ­found. The ­jumping ­height in SJ and CMJ was ­greater in ­young ­women as com­pared to ­older ­groups, and in ­middle-­aged ­women ­greater as com­pared to eld­erly ­women. Abso­lute and ­body ­mass-­related ­values of CMJ ­height was ­greater as com­pared to SJ ­height ­only in ­young ­women. ­Young ­women had ­greater ­jumping ­height rel­a­tive to ­body ­mass in SJ and CMJ ­than the ­other ­groups.
Con­clu­sion. The ­ability to ­develop iso­metric ­force of the ­knee ­extensor mus­cles rap­idly did not ­differ sig­nif­i­cantly in ­middle-­aged and eld­erly ­women. ­Middle-­aged and eld­erly ­women had a ­reduced ­ability to use the pot­en­tiating ­effect of ­stretch-short­ening ­cycle to ver­tical ­jumping per­for­mance ­during CMJ.

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