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The effect of fatigue on lower extremity mechanics during the unanticipated cutting maneuver / Title on signature form: Effect of fatigue on lower extremity mechanics during the unanticipated sidecutting maneuverWeiss, Kaitlyn J. 04 May 2013 (has links)
Fatigue has been observed to affect lower extremity mechanics during the cutting
maneuver. However, there is a lack of research examining the effect of fatigue and limb
dominance on lower extremity mechanics during unanticipated sidecutting. Objectives:
This research sought to assess mechanical differences pre- and post-fatigue and with
respect to limb dominance. Design: Repeated measures. Methods: Thirteen female
collegiate soccer and field hockey players performed right and left unanticipated
sidecutting following the Yo-Yo Intermittent Recovery test (Yo-Yo IR), a two minute
treadmill run at a predicted VO2max, and maximum vertical jumps. Mechanical measures
of ankle, knee, and hip motion were obtained during the stance phase of the cut.
Repeated measures 2x2 ANOVAs were performed to look at fatigue and limb
differences. Alpha level set a priori at 0.05. Results: At initial contact and peak stance,
significant changes pre- to post-fatigue were observed. At initial contact there was a
reduction in knee flexion angles along with increased ankle dorsiflexion angles postfatigue.
At peak stance: increased knee adductor moments post-fatigue; greater ankle
eversion moments on the dominant limb (DL) as well as increased eversion moments post-fatigue for both limbs. There was a differential effect of fatigue on peak hip
abduction angles and hip internal rotation angles at initial contact which were altered in
the DL only; decreased hip adductor moments occurred post-fatigue as well as decreased
power absorption. Conclusions: Results from this study indicate that lower extremity
mechanics are altered as an effect of fatigue such that injury risk may be elevated. / School of Physical Education, Sport, and Exercise Science
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The effect of repetitive drop jumps on landing mechanicsWeinhandl, Joshua T. January 2007 (has links)
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. / School of Physical Education, Sport, and Exercise Science
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Fatigue Related Changes in the Body Motion and Force Application During the Performance of Consecutive Chin-upsHong, Der-Ming 12 1900 (has links)
The purpose of this study was to examine the effects of fatigue on force application and resulting movement patterns during the performance of consecutive chin-ups. Special attention was directed toward relating any fatigue effects to upper limb strength dominance. Twenty male adult subjects each performed one trial. Each trial consisted of consecutive chin-ups. Fatigue caused changes in the movement patterns, duration of movement and force applied through the supporting hands. Throughout the performance greater vertical forces were applied through the dominant upper limb segment with the application of these forces resulting in horizontal displacement of the total body center of gravity toward the dominant hand.
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Prophylactic ankle stabilizers and their effect on lower extremity landing mechanics during drop jump landings to fatigueClanton, Tameka A. January 2009 (has links)
The impact forces at landing are predominately absorbed by the hip, knee and ankle joints. Fatigue has been shown to increase the amount of work performed by the ankle and to reduce the work performed by the knee during landings. The purpose of this study was to assess the kinematic lower extremity motion and kinetic patterns during landings to fatigue, with and without ankle brace usage. Nine recreationally active males (n = 7) and females (n = 2) performed repetitive drop jumps to fatigue for an un-braced and braced condition. Kinematic and kinetic variables were assessed during the first 100 ms after ground impact. Due to the high skill level of the participants, none of the individuals reached a fatigued state. No significant main effect of fatigue was demonstrated on ankle work (p= 0.260). There was no significant main effect due to fatigue on the hip (p= 1.000), knee (p= 1.000) or ankle (p= 0.636) relative work contributions. Fatigue caused a shift toward a more erect landing position at initial ground contact (IGC). No significant main effect of the brace on hip (p= 0.437), knee (p= 0.283) or ankle (p= 0.314) angles was observed at IGC angles. The use of Ankle Stabilizing Orthosis® (ASO) ankle braces caused a shift toward greater knee contribution in a fatigued state. Plantar
flexion angles were decreased the most during the braced un-fatigued condition. There was an inverse relationship between knee and hip angles as compared to ankle angles at IGC. When the hip and knee joint displayed less flexion at IGC, the ankle balanced the positions out by landing in more plantar flexion. / School of Physical Education, Sport, and Exercise Science
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