Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 26 for “"Heel-Strike"”.
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Shock attenuation during heel-strike, forefoot-strike, and spring-boot running
… mechanisms of shock attenuation (SA) during heel-strike (HS), forefoot strike (FFS), and spring-boot (SB) running; Participants (n = 10) ran at 3.83 m·s-1 while head and leg impact acceleration, SA, and ankle and knee energy absorption were recorded and analyzed across the impact phase …
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Unobtrusive integration of magnetic generator systems into common footwear
… generator system was designed to fit in the heel of a standard running shoe, with the rotary arm compressing once during each heel strike. The final system produced a peak power of 1.61 Watts during the heel strike and an average power of 58.1 mW across the entire gait. To maximize power …
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Using Kinetics to Determine Slip Probability in a Movement Associated with a High Risk of Slip Occurrence
… force was generated by 10.08ms following heel-strike, the corresponding slip distance was less than 100mm. By using the horizontal force generation associated with early heel-strike, the probability of correctly classifying slip and non-slip situations was greater compared to the currently …
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Passive dynamic walking with knees : a point foot model
… model switches between the two stages at knee-strike and heel-strike, which are both discrete events modeled as instantaneous inelastic collisions. The dynamics of this model were fully derived analytically. Furthermore, a stable gait was found given a set of physical parameters and initial …
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Design and Evaluation of an Underactuated Lower Body Exoskeleton
… showed an increase in the time between actual heel strike and predicted heel strike of approximately 0.05 seconds to 0.1 seconds. Lastly, calculations are presented examining the effect of exoskeleton assistance on the biological joint moments and optimizing the actuator design to reduce power …
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Models of entrainment of human walking
… model, adjusting its leading leg angle at heel strike and consequently the energy dissipation of the model. Stochasticity was applied to the controller to simulate the variability which has been observed and quantified in walking. The results indicate that energy control may be responsible …
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Ground Reaction Force Differences Between Running Shoes, Racing Flats, and Distance Spikes in Runners
… In order to control for differences in foot strike, only subjects who had a heel strike were included in the data analysis (N=16). Repeated-measures ANOVA and Tukey's post-hoc test (p<0.05) revealed loading rate and impact peak to be significantly increased in the flats and spikes compared to …
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Strategies for using electromyographic signals to control ankle torque in an active joint brace for alleviating drop-foot gait
… of walking and "slapping down" of the foot after heel strike. Alleviation of these gait anomalies would improve mobility efficiency, safety, and cosmesis. Several types of orthotic devices fitted with springs and/or dampers have been used to control torque around the ankle and consequently …
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A knee brace design to reduce the energy consumption of walking
… walking process including the epoch following heel strike. One simulation goal was to explore the knee spring properties which enable lossless walking. Simulations show that there are two knee spring configurations which allow for lossless walking. It is also shown that the percentage of …
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A demonstration of useful electric energy generation from piezoceramics in a shoe
… backplate. The bimorph absorbs the energy of the heel strike and lift during walking, thereby inducing a charge differential across the faces of the PZT. The energy stored in this charge is removed at its peak and converted into a useful form using a high-frequency switching technique. The power …
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Kinematic study of human ankle control during walking
… their foot at a higher velocity after heel-strike while walking than when moving at their maximum voluntary speed. This implies that this motion results in part from foot-ground interaction mediated by the mechanical impedance of the ankle and is not solely imposed by contraction of the …
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Biomimetic design for an under-actuated leg exoskeleton for load-carrying augmentation
… the knee, the damper mechanism is turned on at heel strike as the exoskeleton leg is loaded and turned off during terminal stance to allow knee flexion.
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Theoretical framework for predicting joint reaction and ground reaction forces in a dynamic pendulum tree model of human motion
… stance leg with the ground such as just after heel-strike and just before toe-off, the ground reaction force is modeled as the constraint force on the root pivot joint of the tree. Treating the length of the root segment as a superfluous coordinate introduces a new degree of freedom into the …
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A shoe-integrated sensor system for wireless gait analysis and real-time therapeutic feedback
… the GaitShoe proved highly capable of detecting heel strike and toe off, as well as estimating orientation and position of the subject. A wide variety of features were developed from the calibrated sensor outputs, for use with standard pattern recognition techniques to classify the gait of the …
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Design of a robot for gait rehabilitation
… the collision between the foot and the ground at heel-strike. The goal of this novel device is to allow patients to begin gait therapy before they are able to independently walk overground while maximizing the amount interface driven neural input during stepping in a safe environment.
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Force-controllable ankle foot orthosis (AFO) to assist drop foot gait
… of drop foot are slapping of the foot after heel strike (foot slap) and dragging of the toe during swing (toe drag). The current assistive device is the Ankle Foot Orthosis (AFO), which though offering some biomechanical benefits, is nonadaptive and fails to eliminate significant gait …
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Advancing clinical gait analysis through technology and policy
… at some parts of the gait cycle, particularly heel strike and leg swing.
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Advanced prototyping of variable impedance prosthetic sockets for trans-tibial amputees : polyjet matrix 3D printing of comfortable prosthetic sockets using digital anatomical data
… indicated a 15% and 17% reduction at toe-off and heel-strike respectively at the fibula head while the subject uses a VIPr socket in comparison to a conventional socket of similar internal shape. A corresponding 7% and 8% reduction in pressure is observed along the tibia. Similar trends of …
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To Run or to Carry: Derived Traits in Early Members of the Genus Homo
… increased gluteal attachment sites, and robust heel bones) have been interpreted in the context of long-distance running and persistence hunting (typically adult male activities in modern hunting and gathering societies). However, many human locomotor activities can produce elevated impact …
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A sensor system to detect events in gait for the correction of abnormalities in neurological patients
… reducing the excessive hip flexion/adduction at heel strike. A sensor unit, consisting of four accelerometers,has been designed to determine the angles and linear accelerations of a segment without the need for integration. Tests have been carried out to verify the error of the sensor unit angle …
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