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Anterior Cruciate Ligament (ACL) tears often occur in landing situations due to unbalanced loading of the knee joint. In this study sagittal plane kinematics and kinetics of ACL reconstructed subjects were analysed during bilateral landing at six months after ACL reconstruction and compared to a mat...
To address the lack of sensation that accompanies limb loss, an increasing number of amputees are receiving a nerve transfer surgery, Targeted Reinnervation (TR). Touches at the surgery site can feel as though they originate in the amputated (phantom) limb. However, sensory recovery after this surge...
The metabolic cost of walking is amenable to empirical curve fits, such as the increasing speed-related cost. A typical fit is derived from walking with preferred step parameters (self-selected step length and step frequency), but cannot generalize to other step parameter combinations. Mechanistic m...
Dr. Ahmed studies the costs and rewards underlying the control of movement using a neuroeconomic approach. She will discuss her foundational work investigating the role of energetic cost in shaping non-locomotor tasks, including arm reaching and eye movements.
We evaluated inter-limb movement variability from wireless sensor data captured during treadmill walking and jogging gait. Using machine learning algorithms, gait features were extracted and analysed to classify patients with Anterior Cruciate Ligament reconstructed (ACLR)knees from healthy subjects...
Ankle exoskeletons (exos) can augment human locomotion, but modeling subject-specific responses to exo torques is essential to optimize their design. Existing subject-specific modeling approaches are experimentally cumbersome or contain assumptions that limit model accuracy. We investigated the pote...
Reductions in breast motion from wearing bras have been demonstrated, but relating reductions to subject perceptions of bra effectiveness or correlating reduction to breast size has met minimal success. These shortcomings suggest breast motion, and interaction is not adequately understood. This stud...
The aim of our literature review is to identify the gaps between research outputs, clinical practice, and daily behavior in the rising from a seated position movement of the elderly, and to outline future directions for research on this motion to address issues with an ageing population. A literatur...
Sensory feedback may be manipulated during a stretching intervention by the addition of roller-ball massage. This added feedback can result in a larger increase in range of motion than stretching alone, and may influence motor neuron excitability of the involved muscles.
Knee shape is intimately linked to the kinematics of the knee joint. Deep flexion is important for both cultural and recreational activities. However, the relationship between knee shape and kinematics in deep flexion are not well understood. The aim of this study was to examine the association betw...
This study evaluated the mechanical determinants of 40-m sprint performance and identified variables of a countermovement jump (CMJ) that relate to 40-m sprint performance in Australian Rules Football (ARF) athletes. Sprint mechanics were calculated using inverse dynamic methods from sprint times, w...
Wearable device adoption is on the horizon for various populations, however there has been little consideration of long-term device impacts on the musculoskeletal system. Using a computational model, we investigated the influence of both exoskeleton device parameters and anticipated user behavioral ...
Optoelectronic plethysmography (OEP) is a 3D motion capture technique that provides information on an individual’s breathing pattern by measuring the movement of the chest wall. The purpose of this study was to determine if OEP derived breathing parameters could distinguish between rest, various e...
The periodic trajectory taken by a muscle on a force-length plot, i.e. a work loop, is an important measure of its function that arises from its active force generation and resistance to motion. Several types of work loops are routinely observed across different muscle types and across species: a la...
Lower extremity stance phase peak joint moments were compared for people with a unilateral transtibial amputation (TTA) running with daily-use (DUPs) and running-specific prostheses (RSPs). RSPs generated greater plantarflexion moments due to their design. Prosthetic limb knee and hip extension mome...
Side-to-side differences in knee biomechanics are considered risk factors for anterior cruciate ligament (ACL) injuries in sports. We found that progressive sport specific sensorimotor training (PSSMT) reduced flexion moment side-to-side differrence during a Drop Jump task. In contrast, machine base...
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...
Knee injury of China’s freestyle skiing athletes of aerial skills project accounts for up to 80% of the total injuries, and the most serious injury is cruciate ligaments injury. This study is to reveal the anterior cruciate ligament(ACL) and posterior cruciate ligament(PCL) injury mechanism and th...
As part of 2018 National Biomechanics Day, Rush University Medical Center planned an ambitious off-site multi-partner celebration of dance biomechanics. The team shares lessons-learned to help biomechanists plan successful collaborative outreach programs with like-minded community organizations.
Real world walking environments are constantly changing in both predictable and unpredictable ways. Our previous research suggests that people form a predictive model of their environment that is used to control whole body walking trajectories in response to novel yet consistent environment changes....
The Intrepid Dynamic Exoskeletal Orthosis (IDEO) is a custom-made carbon fiber orthosis, typically prescribed to patients who experience pain or deficits in strength and range of motion in the foot or ankle joints. The use of the IDEO results in differences in work and power outputs, and work-ratios...
Climbing is a sport requiring strength, flexibility, and coordination. Because children with cerebral palsy have deficits in each of those areas, climbing was proposed and evaluated as a recreational therapy. Participants completed a uniform set of lateral and vertical steps (8 to 16 in). Limb force...
The development of wearable inertial sensors has provided the possibility to assess and diagnose Parkinson’s disease (PD) based on the patients’ gait pattern. The goal of this study was to compare the classification performances from fifteen different combinations of sensor configurations using ...
The aim of this study was to identify differences in plantar pressure patterns in Dutch military recruits with lower leg complaints compared to recruits without any physical complains during their basic military training. Baseline plantar pressure measurements were performed in 1142 military recruit...
We investigated the effect of anterior cruciate ligament (ACL) injury on knee kinematics during walking using a musculoskeletal simulation. Motion data and ground reaction forces of five subjects during walking were captured. A detailed knee model with fourteen ligaments was developed and validated ...
Traditional methods to assess scapular position involve specific devices that may not be widely available to clinicians. In this way, the purpose of the study was to evaluate the reliability and validity of a smartphone clinometer application to assess scapular upward rotation, comparing the results...
The study aimed to quantify measurement errors in knee joint translations owing to soft tissue artefacts and test the linearity of the errors against the flexion angle. Results showed that the errors were largely proportional to the flexion angles, which may be compensated.
This study investigated the type and number of haptic feedbacks that would yield better subject perceived accuracy during walking and running. Findings suggested staggered haptic feedback would lead to higher accuracy than continuous feedback especially when more than two motors were used.
The purpose of this study was to examine ‘men-kaeshi-do’ in kendo technique and clarify the common motions and technical differences at the graded technical level of experienced players. The results of the present study revealed technical differences in the motions of the elbow and knee in each ...
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