Vertical stiffness asymmetries during drop jumping are related to ankle stiffness asymmetries
Issue Date
2016-03-31Subjects
leg-spring behaviourcentre of mass displacement
spring-mass model
torsional spring model
C600 Sports Science
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Asymmetry in vertical stiffness has been associated with increased injury incidence and impaired performance. The determinants of vertical stiffness asymmetry have not been previously investigated. Eighteen healthy males performed three unilateral drop jumps during which vertical stiffness and joint stiffness of the ankle and knee were calculated. Reactive strength index was also determined during the jumps using the ratio of flight time to ground contact time. ‘Moderate’ differences in vertical stiffness (t17 = 5.49; P < 0.001), ‘small’ differences in centre of mass displacement (t17 = -2.19; P = 0.043) and ‘trivial’ differences in ankle stiffness (t17 = 2.68; P = 0.016) were observed between stiff and compliant limbs. A model including ankle stiffness and reactive strength index symmetry angles explained 79% of the variance in vertical stiffness asymmetry (R2 = 0.79; P < 0.001). None of the symmetry angles were correlated to jump height or reactive strength index. Results suggest that asymmetries in ankle stiffness may play an important role in modulating vertical stiffness asymmetry in recreationally trained males.Citation
Maloney SJ, Richards J, Nixon DGD, Harvey LJ, Fletcher IM (2016) 'Vertical stiffness asymmetries during drop jumping are related to ankle stiffness asymmetries', Scandinavian Journal of Medicine and Science in Sports 27 (6) 661-669.Publisher
WileyPubMed ID
27037793Additional Links
http://onlinelibrary.wiley.com/wol1/doi/10.1111/sms.12682/fullType
ArticleLanguage
enISSN
0905-7188ae974a485f413a2113503eed53cd6c53
10.1111/sms.12682
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- Creative Commons
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