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Effect Of Added Mass On Human Unipedal Hopping, Gary P. Austin, Gladys E. Garrett, David Tiberio
Effect Of Added Mass On Human Unipedal Hopping, Gary P. Austin, Gladys E. Garrett, David Tiberio
All PTHMS Faculty Publications
Although hopping is considered a children's activity, it can be used to provide insight into the neuromuscular and biomechanical performance of adults. This study investigated whether mass added during unipedal hopping altered the vertical stiffness, hopping period, and angular kinematics of the lower exteremity of adults. Measures of two-dimensional kinematics and vertical force were made from 10 healthy men during hopping at a preferred period under three conditions: Body Mass, Body Mass +10%, and Body Mass +20%. Adding mass significantly increased hopping period and hip flexion without significantly affecting vertical stiffness, ankle dorsiflexion, or knee flexion. Overall, the findings agreed …
Effect Of Frequency On Human Unipedal Hopping, Gary P. Austin, David Tiberio, Gladys E. Garrett
Effect Of Frequency On Human Unipedal Hopping, Gary P. Austin, David Tiberio, Gladys E. Garrett
All PTHMS Faculty Publications
All mature forms of locomotion involve periods of unilateral stance. Unipedal hopping may provide useful information about the neuromuscular and biomechanical capabilities of a single lower extremity in adults. This study investigated whether hopping influenced vertical stiffness and lower extremity angular kinematics during human unipedal hopping. Vertical force and two-dimensional kinematics were measured in 10 healthy males hopping at three frequencies: preferred, +20%, and -20%. At +20%, compared to preferred, vertical stiffness increased 55% as hip flexion, knee flexion, and ankle dorsiflexion decreased, while at -20%, vertical stiffness decreased 39.4% as hip flexion, knee flexion, and ankle dorsiflexion increased. As …