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We tested the efficacy of real-time biofeedback to augment peak knee extensor moment (KEM) during walking, an outcome relevant to the development of posttraumatic osteoarthritis (PTOA) following knee injury. Subjects averaged changes in peak KEM up to +62% and -57% of normal values, with concomitant...
Hamstring strain injuries are the most common injuries in soccer. The biceps femoris long head muscle (BFLH) is injured most frequently among the bilateral hamstring muscles. Some previous studies reported that the relationships between hamstring strain injuries and the hamstring muscle architecture...
Strokes are one of the leading causes of death for Hispanics living in the United States. Falling is the most frequent complication experienced by individuals with stroke, both in a hospital and community setting. The risk for falls among persons with stroke is greater compared to age-matched health...
The net summed joint work calculated from inverse dynamics analysis of steady state walking is often reported to be nonzero, whereas the total mechanical energy of the body (i.e. kinetic energy and gravitational potential energy) does not change between strides. This discrepancy may be explained by ...
Biomechanical tests aim the understanding of the structure-function relationship often require time-consuming preparation of the samples. During preparation of the tendon samples, occurs an unfavorable effect of sample drying that leads to ultimate dehydration. To invert the impact of tissue samples...
In ten-pin bowling, bowlers try to knock down ten pins, with the allotted two tries. The present study investigated full-body kinematics and kinetics in the lower extremities in elite ten-pin bowling. Our study showed novel findings regarding how elite bowlers changed kinematics over time during the...
Fatigue of skeletal muscles reduces their ability to prevent injuries to their corresponding tendons. For example, Achilles tendinopathy often results when the tendon is overloaded due to fatigue of the triceps surae. To better understand this occurrence, we used a high-density array of electrodes t...
3D printing is increasingly used to design patient-specific medical products [1], such as orthoses. Indeed, 3D printed foot orthoses (FO) have an interesting potential as they can include optimized patterns to locally adjust the mechanical properties according to each patient’s gait pattern. Model...
Three-dimensional (3D) finite element analysis (FEA) was used to quantify the forces transmitted in the anterior talofibular ligament (ATFL) and calcaneofibular ligament (CFL) during non-resisted and resisted ankle internal/external rotation (NIER and RIER). Four healthy male subjects were recruited...
Lateral instability of ankle has been shown to be associated with various pathological conditions of ligaments and cartilage. The purpose of the current study was to compare the variations of repeated motions of the ankle joint complex in healthy individuals and patients with lateral ankle instabili...
Turning, especially in postural dual task conditions, is a challenging daily routine for older adults. The purpose of this study is to investigate the postural control of healthy older adults under postural dual task conditions during turning. A total of 13 healthy older adult were recruited form th...
The purpose of this study was to investigate the changes in the knee joint mechanics in the frontal plane induced by two typical exercise-induced fatigue protocols. Fifteen trained male athletes were recruited. Frontal plane knee joint kinematics and ground reaction forces were recorded. No signific...
The Upper Quarter Y-Balance Test (YBT‐UQ) is a closed-chain upper extremity test for assessment of unilateral upper extremity function to identify limitations and asymmetries in the reaching and the stabilizing limb. Whereas several aspects of the test have been examined (reliability, validity, co...
One of the factors for increasing the ball speed in soccer is the swing speed of the kicking foot. Although previous studies have reported that kinetics and kinematics are important factors for increasing swing speed, detailed knowledge regrading mechanical energy transfer between segments (energy f...
Exoskeletons reduce whole-body net metabolic rate by modifying limb-joint biomechanics. Yet, muscles, not limb-joints, are the primary consumers of metabolic energy during locomotion. Perplexingly, it is unestablished how exoskeletons alter muscle dynamics to improve locomotion economy. We investiga...
To correct for soft tissue artefacts in skin mounted accelerometers a transmissibility function can be applied to the data. This function is quantified by analysis of the acceleration-time data from the response to a nudge test; however this data can often be noisy. An application of Fourier analysi...
In this study we created an integrated system combining motion capture, plantar pressure, and shear stress. This device was used to investigate the effects of walking speed on metatarsophalangeal (MTP) joint power and work. MTP negative work increased substantially with walking speed, illustrating t...
Foot orthoses (FOs) are commonly used to alleviate several pathologies. Their design will affect differently lower limb kinematics. Additive manufacturing, 3D printing, makes it easier to provide innovative geometries of customized FOs in accordance to patient-specific needs. This study aimed at est...
The aim of this study is to determine the forearm muscle activity and fatigue depending on the type of mouse during a long-term computer mouse task. Musculoskeletal disorders can be caused by persistent muscle load when working with computer mouse in a non-neutral posture of forearm. Although a vert...
Load carriage is an essential component of combat operations sometimes requiring warfighters to maintain a walking gait (forced march) at a velocity beyond the normal gait transition point. Little is known about the biomechanical consequences of forced marching on lower extremity kinematics for fema...
This study investigated the effect of passive exoskeleton use on shoulder torque control in an intermittent shoulder-loading task. Sixteen participants completed 15 30-sec cycles of intermittent, isometric shoulder contraction at 90º both in the sagittal and scapular planes, with a 50% duty cycle a...
This study explores the potential benefits of interacting with variable damping-defined environments to improve the trade-off between mediolateral ankle agility and stability in the frontal plane standing. While wearing an exoskeletal robot supported by a knee brace, subjects were instructed to move...
Powered exoskeletons could be used to greatly improve a patient’s functionality, and this is especially true if they are able to accurately predict user intent. Electromyogram (EMG) and motion capture data was recorded from three subjects (two female, one male) while performing 15 walking trials. ...
In vivo studies of joint moment-velocity relationships usually do not breakdown the contributions of individual muscles. Namely, force contributions of individual muscles may change according to muscle group isotonic load. To address this question, we measured the in situ force-velocity (F-V) proper...
Studies of localized muscle fatigue (LMF) under varying physical workload conditions often necessitate experimental testing on multiple days. This study evaluated objective and subjective LMF responses during an identical elbow flexion fatigue protocol on three repeat visits to the laboratory. We fo...
This is a biomechanical study evaluating the micromotion of a baseplate in a reverse shoulder arthroplasty during simulated abduction. We tested the following factors: bone density, screw length, number of screws, screw angle, and central peg length. Our findings corroborate the importance of higher...
Foot ligaments are non-linear viscoelastic structures that become stiffer as loading rate increases. This study aims to characterize the rate dependent stiffness of foot ligaments at various loading rates. After excising and potting bone-ligament-bone specimens, ligaments were displaced to 10% strai...
The longitudinal changes in foot pressure asymmetry for n=30 children with unilateral clubfoot was measured. Asymmetry for foot size and contact area were measured. Asymmetry between the unaffected and affected sides increased in all parameters. Significant increases in asymmetry were seen for the f...
The purpose of this work was to evaluate changes in forearm muscle co-contraction caused by sudden wrist perturbations during a dynamic wrist tracking task using a haptic wrist robot. Surface electromyography was recorded from eight muscles of the upper-limb. Co-contraction ratios for all muscle pai...
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