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The potential influence of hip muscle activity on the control of postural sway is often overlooked. To explore this, we used the NIH toolbox test of standing balance as well as tests of force steadiness and maximal voluntary contraction torque for the ankle flexors and extensors and the hip abductor...
The purpose of this pilot study was to determine differences in gait in cancer survivors with and without neuropathy and healthy controls. Nine cancer survivors with neuropathy, 8 without neuropathy, and 12 healthy controls walked at their normal pace across a walkway. Gait speed, step length, and s...
Excessive hip adduction and knee valgus are common movement impairments that underlie various lower-limb injuries in runners. The purpose of the current study was to determine the associations among frontal plane hip and knee kinematics during running, hip abductor strength, and pelvis width. Result...
Subject-specific shoulder joint models can be used as clinical tools in pre-surgery planning as well as post-surgery rehabilitation domains. We performed a comparison of muscle mechanics between shoulder joint models that have generic and subject-specific muscle insertions. Ten healthy cadaveric sho...
While collagen is believed to be a major passive load bearing structure in muscle, previous work reports a very weak correlation between muscle collagen content and passive stiffness [1,2]. This may result from a lack of appreciation of intramuscular anatomical variations among muscle fibers and con...
Non-motorized ‘passive’ exoskeleton designs can reduce the metabolic cost of walking by reducing triceps surae activity. We evaluated the consequences of submaximal voluntary activation on the plantar flexion torque-ankle angle relationship. Our preliminary results indicate that this relationshi...
To improve the methods used to compare density-modulus relationships and material mapping strategies, this study used experimental loading of scapulae within a micro-CT. Experimental boundary conditions (BCs) were replicated in QCT-FEMs using digital volume correlation (DVC), and DVC was used to com...
The kinematic characteristics and the passive mechanical properties of the ankle joint are determined primarily by the morphology of the articulating surfaces. Designing artificial surfaces for Total Ankle Replacement (TAR) that can effectively replace natural surfaces damaged by arthritis requires ...
The current study examined 200 outdoor training runs from 23 recreational runners at predefined durations and intensities. The first and last 10% of each training session were compared for fatigue effects on dynamic loading, stability, and spatio-temporal variables using a single trunk mounted accel...
Power-walking has an increasing popularity in fitness and rehab-programs, due to its expected lower impact forces. The study showed a lower impact forces than jogging and between 15% and 76% higher muscular activity than walking.
Multiple linear regressions were conducted to determine which kinematic and temporospatial variables best predict reduction in knee abduction moment (KAM) during gait modification (GM). Only varus knee angle and stride width predicted KAM reduction in GMs. These results demonstrate that factors asid...
This study compares the running mechanics of male and female runners. Motion analysis data and plantar pressure data were collected from healthy runners. Statistical analysis showed no significant differences in joint coordination variability or kinetics between healthy male and female runners.
In this study, hip torques in the transverse plane were analysed during the side-walk exercise with elastic resistance. Besides showing that the resistance offered by the elastic band does not seem to agree with commonly set goals of hip rehabilitation, our results show that torque outputs and and t...
Some evidence suggests that plantarflexor muscle fascicles in older adults operate at shorter lengths further down the ascending limb of the length-tension curve than in young adults. This may restrict how volitional increases in activation, for example in gait retraining, propagate to larger ankle ...
Obesity reduces agonist EMG activity during single joint exercises, but the effects of obesity on EMG activity during dynamic activities of daily living are largely unknown. To examine how obesity affects EMG activity during sit-to-stand (STS), an essential daily living task, we measured EMG activit...
We analysed the sagittal plane stance phase joint mechanics of athletes with and without unilateral below the knee amputation (BKA) during maximum speed sprinting and long jump. We estimated the strut, spring, motor and damper like function of the main lower extremity joints using functional joint i...
The implant-to-bone interface of endoprostheses is a critical region affecting the stability of the implant. Current advancements in additive manufacturing allow to manufacture novel bone-replicating porous surfaces capable to enhance osteointegration. In this study, small cylindrical porous samples...
Using serial elastic elements as an interface between human and isokinetic machine can positively influence the muscular work during contraction. The approach of the study was to evaluate effects of additional serial elasticity on the efficiency during force transmission. First results are promising...
The purpose of this study was to evaluate the dynamic knee joint stiffness of paediatric females with and without an ACL rupture. Healthy and injured paediatric females performed five bilateral squats and completed the Pedi-IKDC questionnaire. While the Pedi-IKDC indicated a significant change in fu...
High stride time variability, the integrated motor output of the locomotor system, is a factor in age-related falls. The origin of this variability remains unclear, but likely originates from variability of the motor inputs and outputs from individual muscles and joints. The gait of Italian males an...
This study demonstrates the feasibility of applying quadriceps FES during walking as a new method to overcome quadriceps muscle weakness during early rehabilitation post-ACLR. Compared to NMES, patients who received FES achieved better results in quadriceps strength and symmetry. While both interven...
Maintaining joint stability is crucial for proper simulation of glenohumeral joint kinematics in the cadaveric setting. This study uses updated methodology to isolate the native intraarticular pressure’s role in glenohumeral joint stability.
The aim of this study was to investigate the capacity of foot-worn inertial and magnetic sensors to detect hurdle crossings and provide a detailed spatiotemporal running analysis of a 400 meters hurdling race. The results showed that the flight phase duration combined with the foot orientation or wi...
Asymmetry indices provide insights into walking mechanics in populations with unilateral deficiencies. The number of strides used in specific studies varies, and often there are equivocal outcomes for symmetry reported in the literature. Thus, it is worth understanding the influence of the number of...
The abrupt lateral translation of the knee during walking, often referred to as varus thrust, has been used as a proxy of medial knee loading in patients with knee osteoarthritis. While attempts have been made to quantify varus thrust using high-speed motion capture or accelerometers, there is littl...
Osteoarthritis (OA) development after anterior cruciate ligament reconstruction (ACLR) is a well-documented phenomenon. Loading alterations early after surgery have been linked to the development of OA. Early OA is characterized by the loss of glycosaminoglycans (GAG) within cartilage. This study ex...
Lower limbs muscle force capabilities can be determined during all-out sprints, but the method is accurate only if the testing protocol provides a good fit of the data in the torque-velocity (T-V) and power-velocity (P-V) relationship curves. This study compared the goodness of fit from single all-o...
The purpose of this research study was to examine postural control strategies used by people who participate in boarding sports on stable and unstable surfaces. Eleven healthy young adults (6 F) with boarding experience and 13 controls (6 F) were recruited. Participants underwent 2 testing component...
A kinematic analysis of vaulting in comparison with normal walking was performed as 20 participants walked over level ground with and without a brace restricting knee flexion on the right side. It was determined that vaulting results in significantly different plantarflexion and dorsiflexion ankle a...
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