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 80 for “"Ground Reaction Force"”.
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The Effect of Foot Supports on Ground Reaction Force Patterns
… or valgus deformity can create changes in the ground reaction force patterns, causing increased stress to the anatomical structures of the foot. Foot supports reestablish proper alignment of the forefoot, resulting in a more typical ground reaction force pattern.
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Effects of fatigue on bilateral ground reaction force asymmetries during the squat exercise
… mass). Anthropometric measurements and vertical ground reaction force (GRFv) data were collected. GRFv asymmetries were calculated by subtracting the % load on the right foot from that of the left foot. Initially highly symmetric subjects (± 1.7%) were removed from the analyses. The first two …
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Ground Reaction Force Analysis of the Anterior and Cross-Over Single Leg Hop Tests
… hop is an optimal distance to stimulate excess forces on the lower extremity when compared to the anterior hop. When the athlete is able to complete the cross-over hops successfully, it is thought that they are able to return to play in their given sport. A problem with this assumption is that …
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Ground Reaction Force Differences Between Running Shoes, Racing Flats, and Distance Spikes in Runners
To measure the differences in ground reaction forces between running shoes, racing flats, and distance spikes, twenty intercollegiate distance runners ran across a force plate at 6.7m/s (for males) and 5.74m/s (for females) in each of the three types of shoes. In order to control for differences in …
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Estimation of ground reaction force and zero moment point on a powered ankle-foot prosthesis
… prostheses are passive when in contact with the ground surface, and thus, their mechanical properties remain fixed across different terrains and walking speeds. The passive nature of these prostheses causes many problems for lower extremity amputees, such as a lack of adequate balance control …
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Effects of Prolonged Running on Ground Reaction Force Patterns Wearing Shoes of Different Midsole Durometers (Fatigue)
Selected force events and the relative timing of their occurrence, were chosen for evaluation from the GRF curves obtained from 15 subjects, 18 to 49 years, running "as hard as possible." GRFs were measured on a force platform at the start, middle, and end of one hour of running. Testing took place …
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The Effect of Heel Lifts on Ground Reaction Force Patterns and Lower Extremity Joint Angles in Subjects With Structural Leg Length Discrepancies
… was to determine the effect of heel lifts on ground reaction force patterns and lower extremity joint angles during the stance phase of walking in subjets with structural leg length discrepancies. Eighteen subjects aged 20 to 63 years with LLDs ranging from 3/16 inch to 7/8 inch participated …
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Beyond jump height: Understanding the kinematics and kinetics of the countermovement jump from vertical ground reaction force data through the use of higher-order time derivatives
… human research, largely through analysis of the ground reaction force-time signal obtained during jumping. Such analysis has required the definition and then the calculation of several critical kinematic and kinetic variables (including peak force, peak eccentric [braking] force, peak power, rate …
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The validation of muscle power output measures in lower and upper body resistance exercises
… reliability and comparability of measurements of force, velocity and power measured simultaneously during upper and lower body resistance exercises for the following three methods: a) power derived from ground reaction force, i.e. using a force plate (FP), b) power derived from the displacement of …
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Human readaptation to normal gravity following short-term simulated Martian gravity exposure and the effectiveness of countermeasures
… to simulated Martian gravity by examining the ground reaction force, muscle electromyogram, and joint kinematics of the lower body extremities. The "Moonwalker II" simulator, designed and developed with features such as modularity, stability, and versatility, closely simulates a partial gravity …
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Kinematic and Kinetic Analyses of E-TPU Material in Bowling Footwear
… All shoes underwent static testing on top of a force platform. The static test involved dropping a 0.5 kg dumbbell inside a PVC pipe from a height of 0.61 meters onto the heel cup region in each type of shoe. Twelve healthy, college, right-handed recreational males participated in dynamic …
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Assessment and enhancement of lower extremity power of athletes
… OF PERFORMANCE MEASUREMENTS DERIVED FROM GROUND REACTION FORCE DATA DURING COUNTERMOVEMENT JUMP AND INFLUENCE OF SAMPLING FREQUENCY. STUDY 2: COMPARISON OF FOUR DIFFERENT METHODS TO MEASURE POWER OUTPUT DURING THE HANG POWER CLEAN AND THE WEIGHTED JUMP SQUAT. STUDY 3: DOES PERFORMANCE OF …
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Broadening the Capability of Kinetics Analysis in Biomechanics
… alternative upper designs in shoes might have on ground reaction force measures of performance. The second review and study evaluate methods of predicting ground reaction forces without the use of a force platform. A method of using effective forces and ways of improving its accuracy are evaluated …
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Learning Emergent Gaits with Decentralized Phase Oscillators: on the role of Observations, Rewards, and Feedback
… corresponding leg through local feedback of the ground reaction force, which we interpret as an observer feedback gain. The oscillator itself is interpreted as a latent contact state-estimator. Through a systematic ablation study, we show that the combination of phase observations, simple …
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The effect of ankle-foot orthosis on gait and the procedures used to assess bi-articular muscle length and spasticity in subjects with diplegic cerebral palsy
… thigh kinematics, vertical component of ground reaction force (FZ2) and ground reaction force (GRF) alignment in relation to hip and knee joint in temporal midstance to late stance. The understanding of the implication of, and the tools used to conduct assessment procedures and …
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Design, Fabrication and Calibration of Compliant, Multi-Axis, Fiber-Optic Force/Torque Sensors for Biomechanical Measurements
… of various prototypes of multi-axis, compliant force and torque sensors based on fiber-optic sensing technology, the novel calibration methodologies and the experimental results. A compliant 3-axis, intensity modulated-based, fiber-optic force sensor that simultaneously measures normal and shear …
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Enhanced dynamic load sensor for the International Space Station : design, development, musculoskeletal modeling and experimental evaluation
… exercise countermeasures compare to those on the ground, an accurate load sensing system is needed to collect ground reaction force data in reduced gravity.
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The effect of surface compliance on the cost and benefit of performing drop-jumps
… jumps (DJ). The cost was quantified using peak ground reaction force (GRF) (FPEAK), time to peak GRF (TFPEAK) and loading rate (LR). The benefit was quantified using lower extremity stiffness (K) and amortization phase (AMORT). Ten female subjects performed five DJ trials each on a force plate …
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Evaluation of gait kinematics and kinetics using a powered ankle-foot orthosis for gait assistance in people with multiple sclerosis
… device. Results indicate that the vertical ground reaction force during the propulsive phase of gait (i.e., terminal stance) was increased with the powered ankle-foot orthosis, counteracting the diminished behavior typically observed in people with MS. However, peak plantarflexor torque …
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Hierarchical controller for highly dynamic locomotion utilizing pattern modulation and impedance control : implementation on the MIT Cheetah robot
… running: locomotion stability, control of ground reaction force, and coordination of four limbs. To tackle these challenges, the proposed algorithm employs three strategies. Leg impedance control provides programmable virtual compliance of each leg which achieve self-stability in …
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