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Application of force-length curve for determination of leg stiffness during a vertical jump

Artykuł
Czasopismo : Acta of Bioengineering and Biomechanics   Tom: 18, Zeszyt: 2, Strony: 163-171
2016 angielski
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Cechy publikacji
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  • Oryginalny artykuł naukowy
  • Zrecenzowana naukowo
Dyscypliny naukowe
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Nauki o kulturze fizycznej
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Abstrakty ( angielski )
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Purpose : The aim of this study was to present the methodology for es timation of a leg stiffness duri ng a countermovement jump. The question was asked whether leg sti ffness in the countermovement and take-off phases are similar to each other as demonstrated i n previ- ous reports. It was also examined whether the stiffness in left lower limb is similar to the one in right lower limb. Methods : The research was conducted on 35 basketball players. Each participant perform ed three countermovement jumps with arm swing to the maximum height. Measurements employed a Kistlerforce plate and a BTS SMART system for motion analysis. Leg stiffness (understood as an inclination of the curve of ground reaction forces vs. length ) was computed for these parts of countermovement and take-off pha ses where its value was rela tively constant and F ( ∆ l ) relationship was similar to linear. Results : Mean value (±SD) of total stiffness of both lower limbs in the countermoveme nt phase was 7.1 ± 2.3 kN/m, whereas this va lue in the take-off phase was 7.5 ± 1 kN/m. No statistically significant diff erences were found between the leg stiffness in the countermovement a nd the take-off phases. N o statisti- cally significant differences were f ound during the comparison of the stiffne ss in the right and left lower limb. Conclusions : The calcula- tion methodology allows us to estimate the value of leg stiffness based on the actual shape of F ( ∆ l ) curve rather than on extreme values of ∆ F and ∆ l . Despite different tasks of the countermove ment and the take-off phases, leg stiffne ss in these phases is very similar. Leg stiffness during a single vertical jump maintains a relatively constant value in the parts with a small value of acceleration.
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