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Leg stiffness during phases of countermovement and take-off in vertical jump

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Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
With respect to cyclic movements such as human gait, running or hopping, leg stiffness is a little variable parameter. The aim of this study was to investigate changes in leg stiffness during the phase of countermovement and take-off when performing a single maximum counter-movement jump. Kistler force plates and a BTS SMART system for comprehensive motion analysis were employed in the study. The study covered a group of 12 athletes from university basketball teams. Leg stiffness was calculated in those parts of countermovement and take-off phases where its level is relatively constant and the relationship F(Δl) is similar to linear one. Mean total stiffness (±SD) in both legs in the countermovement phase amounted to 6.5 ± 1.5 kN/m, whereas during the take-off phase this value was 6.9 ± 1 kN/m. No statistically significant differences were found between leg stiffness during the countermovement phase and takeoff phase in the study group at the level of significance set at α = 0.05. This suggests that the leg stiffness in phase of countermovement and phase of take-off are much similar to each other, despite different function of both phases. Similar to cyclic movements, leg stiffness turned out relatively constant when performing a single vertical jump. There are also reported statistically significant correlations between body mass, body height, length of lower limbs and leg stiffness. The stiffness analysed by the authors should be understood as quasi-stiffness because the measurements of ΔF(Δl) were made during transient states where inertia and dumping forces are likely to affect the final result.
Rocznik
Strony
113--118
Opis fizyczny
Bibliogr. 19 poz., tab., wykr.
Twórcy
autor
autor
  • Department of Biomechanics, University School of Physical Education, Wrocław, Poland
Bibliografia
  • [1] BOBER T., Efektywność techniki ruchu pod kątem działania mięśni w cyklu rozciągnięcie-skurcz (CR-S), [in:] R. Będziński et al. (eds.) Biomechanika ’94: XII Szkoła Biomechaniki, Wrocław–Szklarska Poręba, 20–23 października 1994 r. Oficyna Wydawnicza Politechniki Wrocławskiej, Wrocław, 1994, 50–60.
  • [2] BOBER T., ZAWADZKI J., Biomechanika układu ruchu człowieka, BK, Wrocław, 2006.
  • [3] ZAWADZKI J., Zależność sztywności w stawie łokciowym od stanu naprężenia mięśni zginaczy i prostowników stawu, Annales Universitatis Mariae Curie-Skłodowska, Medicina, 2006, Vol. 60(8 suppl. 16), 452–455.
  • [4] ZAWADZKI J., SIEMIEŃSKI A., Maximal frequency, amplitude, kinetic energy and elbow joint stiffness in cyclic movements, Acta Bioeng. Biomech., 2010, Vol. 12(2), 55–64.
  • [5] FARLEY C.T., GLASHEEN J., MCMAHON T.A., Running springs: speed and animal size, J. Exp. Biol., 1993, Vol. 185(1), 71–86.
  • [6] FARLEY C.T., GONZÁLEZ O., Leg stiffness and stride frequency in human running, J. Biomech., 1996, Vol. 29(2), 181–186.
  • [7] HUNTER I., A new approach to modeling vertical stiffness in heel-toe distance runners, J. Sports Sci. Med., 2003, Vol. 2(4), 139–143.
  • [8] FERRIS D.P., FARLEY C.T., Interaction of leg stiffness and surface stiffness during human hopping, J. Appl. Physiol., 1997, Vol. 82(1), 15–22.
  • [9] FARLEY C.T., HOUDIJK H.H.P., VAN STRIEN C., LOUIE M., Mechanism of leg stiffness adjustment for hopping on surfaces of different stiffnesses, J. Appl. Physiol., 1998, Vol. 84(3), 1044–1055.
  • [10] GRANATA K.P., PADUA D.A., WILSON S.E., Gender differences in active musculoskeletal stiffness. Part II. Quantification of leg stiffness during functional hopping tasks, J. Electromyogr. Kinesiol., 2002, Vol. 12(1), 127–135.
  • [11] HOBARA H., INOUE K., MURAOKA T., OMURO K., SAKAMOTO M., KANOSUE K., Leg stiffness adjustment for a range of hopping frequencies in humans, J. Biomech., 2010, Vol. 43(11), 1768–1771.
  • [12] DALLEAU G., BELLI A., VIALE F., LACOUR J.-R., BOURDIN M., A simple method for field measurements of leg stiffness in hopping, Int. J. Sports Med., 2004, Vol. 3(25), 170–176.
  • [13] LIU Y., PENG C.-H., WEI S.-H., CHI J.-C., TSAI F.-R., CHEN J.-Y., Active leg stiffness and energy stored in the muscles during maximal counter movement jump in the aged, J. Electromyogr. Kinesiol., 2006, Vol. 16(4), 342–351.
  • [14] CHENG K.B., HUBBARD M., Optimal jumping strategies from compliant surfaces: A simple model of springboard standing jumps, Hum. Mov. Sci., 2004, Vol. 23(1), 35–48.
  • [15] LIMA J.C.B., MARIN D.P., BARQUILHA G., DA SILVA L.O., PUGGINA E.F., PITHON-CURI T.C., HIRABARA S.M., Acute effects of drop jump potentiation protocol on sprint and countermovement vertical jump performance, Hum. Mov., 2011, Vol. 12(4), 324–330.
  • [16] PIETRASZEWSKI B., RUTKOWSKA-KUCHARSKA A., Relative power of lower limbs in drop jump, Acta Bioeng. Biomech., 2011, Vol. 13(1), 13–18.
  • [17] LATASH M.L., ZATSIORSKY V.M., Joint stiffness: Myth or reality?, Hum. Mov. Sci., 1993, Vol. 12(6), 653–692.
  • [18] KUSZEWSKI M., SAULICZ E., GNAT R., Potencjalny paradoks: sztywność mięśni – niezbędna czy niepożądana?, Fizjoterapia, 2008, Vol. 16(1), 92–98.
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Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-04f03123-5c12-4df1-8a15-49e86771e76e
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