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Original articles  EXERCISE PHYSIOLOGY AND BIOMECHANICS


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

language: English

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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