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This study reports the effectiveness of a 6-week ankle training program using a stiffness-controlled robotic platform on paretic ankle motor control and lower extremity function in stroke patients. Two chronic stroke subjects with right hemiparesis participated in training for 12 sessions over 6 wee...
Humans can control their actions in unpredictable environments, such as adjusting a tennis serve on a windy day. Here we examined how our nervous system uses both predictive and feedback control in response to uncertain mechanical loads. Participants reached to a target in the horizontal plane. An e...
Walking independence is an important component of the elderly’s quality of life. Losses in muscle mass may impair mobility and reduce independence. Here we determined whether lower limb muscles’ thickness relates to and is able to explain the gait performance. Fifteen older individuals participa...
Women’s participation in running events has increased drastically. In particular, more women have participated in running races in the U.S. between the mid-2000s and 2016 than men. With an increase in overall participation, particularly with the participation of women in race events, more research...
Women make up a large percentage of the running population, however research to understand benefits and risks of continuing to run into the silver years is limited. Our work suggests age-related changes in neuromuscular function and running mechanics are not the same for males and females and female...
Patellar tendon and hamstring tendon grafts are two most common grafts in ACL reconstruction. Biomechanical differences of the knee function following ACL reconstruction with these grafts are still unclear. This study found some differences in sagittal plane kinetics during stair climbing.
In recent years many efforts have been done to describe the hemodynamic in intracranial aneurysms, and how it is related to the origin and growth of this cerebrovascular disorder. Numerical simulation has become a widely used tool for the study of hemodynamic; employing idealized and realistic geome...
The practice of kinesiology taping has grown in popularity despite the lack of biomechanical evidence of efficacy. This study aimed to evaluate electromyographic activity of the low back during a simple bridge exercise with the hypothesis that there would not be a significant difference in muscle ac...
Muscle and knee forces were estimated for a female athlete performing a drop vertical jump (DVJ) to quantify tibial anterior shear force (ASF) during landing. The contribution of the gastrocnemius muscle to peak ASF was assessed. The gastrocnemius wrapping around the posterior aspect of the tibia co...
This study aimed to investigate how the variability associated with human-provided physical assistance impacts patient locomotor training outcomes. To this end, a cyberphysical rehabilitation system was developed that allowed assistive forces to be rendered on patients by either a human therapist or...
The study proposed a model-based tracking procedure integrating an asynchronous biplane imaging system, motion compensated frame interpolation and two different image registration strategies, namely forward-projection and backward-projection methods, for measuring 3-D dynamic joint motion. Successfu...
Tackling is repetitively performed in rugby game play, critical to team performance, yet poor execution increase injury risk. Players are taught from a young age to engage in 1-on-1 lower or upper body tackles, yet limited research on whether coaching instruction can alter three-dimensional (3D) tac...
Overweight and obese children have increased knee abduction angles and moments throughout stance compared to normal weight children.
We developed models to predict peak vertical ground reaction force (vGRF), vertical impulse, and contact time (tc) from running speed and a waist-mounted accelerometer. 25 collegiate cross country athletes ran at 3.8-5.4 m/s while we measured vGRF and sacral accelerations. We low-pass filtered accel...
It has been reported that squatting with the knees forward of the toes increases stress on the knee. A limitation of previous studies in this area is that the influence of shank position has been studied without consideration of trunk position, which has been shown to reduce the knee extensor moment...
Ultrasonic imaging is a safe, established and non-invasive method to visualize the position of tissues within the body. Coupling existing skin mounted motion capture markers to ultrasound sensors could allow for precise measurement of bone position and orientation, without the loss in accuracy due t...
Endurance athletes commonly believe that shifting from running to cycling participation will reduce injury risk. However, overuse injury rates in these two sports are very similar [1,2]. A dynamical systems approach was performed to assess how segment coordination variability differs between running...
Reliable and accurate localization and pose recovery of objects (bones and fiducials) in a high-speed biplanar X-ray system is dependent on an adequate model of the imaging chain. This work investigated the contributions of multiple sources of calibration errors in the chain. The results provided in...
The validity of sensorimotor balance control during walking was studied using foot placement and adjustment for foot placement during single stance. Nine stroke patients and 18 healthy controls performed a 2 minute walk test. Foot placement and adjustment for ‘incorrect’ foot placement (single s...
The fast-evolving field of robotics offers tantalizing potential to help individuals who lost motor functions. However, only in science-fiction movies do we see people casually moving around in robotic suits in their daily lives. Current technology still faces many challenges, like cost, usability,...
Surrogate measures of medial joint loading during walking are related to structural progression of knee osteoarthritis (OA). As muscle forces contribute to joint loading, muscle activation may influence OA disease course. Increased muscle co-contraction has been identified in individuals with knee i...
Although well-designed and properly fitted sports bras can reduce exercise-induced breast discomfort, women often report experiencing frictional bra-breast injuries during prolonged bouts of running. Frictional bra-breast injuries in sport have been significantly associated with age and breast size,...
Many studies showed that the running biomechanics of lower extremity was influenced by running shoes. Recently, gait retraining programs also did exert certain effects on the running impact characteristics. However, few rigorous scientific studies have been conducted to compare the biomechanics of l...
The aim of this study is to validate trunk, pelvis, hip, knee and ankle kinematics assessed by an inertial sensor system in healthy controls (HC) and persons with knee osteoarthritis (KOA) during a functional movement protocol. Therefore, kinematics were compared against an optoelectronic system. Th...
All animals must effectively sense and respond to their environment in order to survive. Successfully recovering from a stumble, escaping a predator, or catching prey requires quickly detecting changes in the environment and performing appropriate compensatory movements. The speed of an animalâ€â...
Background: Sexual minority are at increased risk for mental health problems and substance use, and accumulating evidence indicates that bisexual youth are at greatest risk. However, bisexual youth are not a homogenous group and scholars have called for greater attention to the intersections of mult...
Ankle and hip joins are identified as crucial segments for corrective movement in balance. The aim of this study was to assess the connection of COM, pelvis, hip, knee and ankle and gait ground reaction forces with results of BIODEX LOS tests on stable/unstable surface. Kinematics was captured with ...
Lower limb tissue stiffness is contingent on various factors, including body composition, loading rates, and the geometry of the indenting object. Being able to predict deformation of human soft tissue under different loading conditions could enable researchers and engineers to improve performance o...
Muscular power is reduced with fatigue [1,3]. During cyclic contractions muscular power is highly dependent upon force-velocity characteristics (F0, Vmax, curvature) and activation-deactivation dynamics [2], which change with fatigue [1,3]. Determining the contribution of changes to each characteris...
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