The effect of repetitive drop jumps on landing mechanics

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dc.contributor.advisor Dugan, Eric L. en_US Weinhandl, Joshua T. en_US 2011-06-03T19:41:18Z 2011-06-03T19:41:18Z 2007 en_US 2007
dc.identifier LD2489.Z78 2007 .W45 en_US
dc.description.abstract The purpose of the study was to investigate the effects of fatigue on the lower extremity landing strategies of males and females. Twelve recreationally active males (n = 6) and females (n = 6) (nine used for analysis) performed repetitive drop jumps until they could no longer reach 20% of their initial drop jump height. Kinematic and kinetic variables were assessed during the impact phase of all jumps. At initial ground contact, males exhibited greater extension at the hip and knee and less plantar flexion than females. However, females performed more eccentric work during the impact phase of landing. Fatigue resulted in an increased extension at the hip, knee, and ankle for both genders, but did not have an effect on the peak VGRF. Fatigue also resulted in an increase in work performed at the ankle and an approximately equal reduction in work performed at the knee for both genders. Investigation of the peak powers revealed that as a result of fatigue, females utilized a landing strategy in which more energy was absorbed at the knee during the early part of the impact phase. The increased reliance on the knee musculature to dissipate kinetic energy during the impact phase of landing demonstrated by females may be a reason for the commonly seen gender disparities in injury rates. Furthermore, the shift towards energy absorption during the initial part of the impact phase when noncontact injuries are known to occur, exhibited by females, may indicate a greater injury risk for females.
dc.description.sponsorship School of Physical Education, Sport, and Exercise Science
dc.format.extent ix, 92 leaves : ill. ; 28 cm. en_US
dc.source Virtual Press en_US
dc.subject.lcsh Jumping -- Physiological aspects. en_US
dc.subject.lcsh Leg -- Mechanical properties. en_US
dc.subject.lcsh Fatigue -- Physiological effect. en_US
dc.title The effect of repetitive drop jumps on landing mechanics en_US Thesis (M.S.)
dc.identifier.cardcat-url en_US

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  • Master's Theses [5318]
    Master's theses submitted to the Graduate School by Ball State University master's degree candidates in partial fulfillment of degree requirements.

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