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Usage of prophylactic ankle braces have been shown to reduce risk of injury while performing various jumping tasks, however the magnitude of the force acting on the knee has not been quantified. This study examined sagittal and frontal plane knee angle and moment at peak ground reaction force (vGRF)...
Ankle sprains occur at a high rate in high school football. Three-dimensional analyses of football related tasks were performed in players with and without history of ankle sprain. Playing position influenced the magnitude of inversion load that football players with a history of ankle sprain exhibi...
Indian infantry soldiers exposed to uphill terrain to fortify their duties with carrying different military loads which influence them to adapt the environmental stress and improve their combat readiness. The gait kinematic changes of the combined effect of load and grade may influence to recruit th...
This randomized clinical trial evaluated the immediate effect of cervical spine manipulation on the maximal isometric strength of shoulder abductors. A total of 26 subjects participated where 13 subjects were randomized into the intervention group (joint manipulation of the cervical spine), and 13 s...
The objective of the present study was to verify the effects of different levels of fatigue on intralimb coordination during the countermovement jump (CMJ). Seventeen male participants performed two fatigue protocols (7 x 10 CMJs and 14 x 10 CMJs). A CMJ was performed before and 1 min after the fati...
This preliminary study investigated the effects of fatigue on hand and wrist biomechanics in a simulated workplace setting to gain insight into repetitive use injuries of the upper extremity. Grip forces, wrist muscle activity and wrist kinematics were measured pre- and post-fatigue during an object...
Gait modification provides a promising method for the treatment of medial knee osteoarthritis (OA). Although gait modifications have been identified to lower the knee adduction moment (KAM), the potential effect on the medial contact force (MCF) are unclear. This study aims at evaluating the effect ...
Insertion torque and insertion energy for dental implants are influenced by bone density, implant geometry, surface roughness, and drill protocol to different degrees. The aim of this study was to investigate the influence of these factors on insertion torque and energy. Torque, displacement, and tw...
We determined the effects of loss of balance direction and postural perturbation on the perturbation threshold line for lean releases, lean releases with surface translations and surface translations in younger adults, not only for forward but also for the first time for sideways and backward losses...
This study uses a previously validated computer simulation (finite element model - FEM) of a healthy rhesus macaque to test the effect of fracture repair implants (plates and screws) on bending and deformation (stress/strain) in the mandible (lower jaw) during chewing. The results of our FEM provide...
The purpose of this study was to investigate the correlation between ankle proprioceptive sensory level and balance ability. Healthy ten volunteers participated in this study. Force sense of the proprioception was evaluated using electromyogram (EMG) on the Tibialis anterior (TA) and Gastrocnemius l...
This study examined the effect of arch-support insole on knee joint biomechanics during stop-jumping. Thirty university basketball players performed stop-jump task in two insole conditions (arch-support and flat). The present results revealed that athletes wearing arch-support insole experienced lar...
Trabecular microstructure was characterized in the proximal humerus in murine models of preganglionic and postganglionic BPBI. The preganglionic injury group had detriments in trabecular bone (e.g., BMD) in the affected forelimb compared to sham and postganglionic injury, consistent with restricted ...
People can continuously optimize their walking gait to reduce energetic cost. However, they do not always do so spontaneously. Here we tested the hypothesis that the cost gradient at the original optimum allows the nervous system to detect when the optimum has changed and thus re-optimize. Using a m...
Male artistic gymnasts performing strength elements in their ring routines need a high level of balance and a maximal strength in their arms and shoulder muscles. The aim of this study was to investigate the effect of a 4-week eccentric-isokinetic training period on muscular activation patterns in t...
A pronated foot posture has been associated with overuse running injuries. To manage symptoms, foot orthoses have been widely used in symptomatic runners with a pronated foot posture. This study examined the immediate effects of foot orthoses with forefoot corrections on forefoot kinematics during r...
Understanding changes in muscle synergies and joint moments when changing from normal walking to running is an important aspect of rehabilitation. This study performed a comparison of joint moments and muscle synergies for three activities viz. walking, fast walking, and running. Gait data was colle...
The present study aims to develop a dynamics model based on the multibody dynamics methodology to study the influence of ligamentous insufficiency on damage estimation, i.e. wear and creep, of total knee arthroplasty. The anterior cruciate ligament is assumed sacrificed during the knee surgery while...
We tested six subjects leaning with vs. without assistance from a spring-powered exosuit. We quantified the effect on back muscle fatigue rate. We found that five of the six subjects showed significant reductions in fatigue rate (ranging from 19-85%) for a subset of lumbar muscles (ranging from one ...
Anterior cruciate ligament (ACL) injury has been shown to compromise joint position sense (JPS) in the knee, which is necessary for controlling joint positioning and movement. This study showed that mechanical noise vibration (MNV) improved JPS in the ACL reconstructed (ACLR) patients at 6 months af...
Ankle range of motion (RoM) may impact knee and hip range of motion in high knee flexion postures (>120°). The purpose of this study was to quantify how differences in ankle sagittal plane RoM affects knee and hip flexion and abduction kinematics. Twenty-eight low and twenty-six high ankle RoM part...
Patellofemoral Pain Syndrome (PFPS) is a condition impacting the anterior knee and is exacerbated with running, squats, climbing stairs, or prolonged sitting. Altering running cadence, using a metronome (5-15% above baseline) has been shown to decrease knee joint forces and pain in individuals with ...
The reduced cardiorespiratory function and muscle performance in the elderly significantly minify an individual's functional aerobic capacity. Some inactive older adults are in an age range that theoretically places them right around their aerobic capacity threshold. Any further decline may make the...
Coordinated muscle contractions are vital for daily functional movements. This study investigated the differences in the muscular activation of the elbow flexors and extensors of two different age groups, during extension movements of the elbow. Fifteen healthy adults and eight healthy children were...
The magnitude of hip impact force during a fall on the ground (i.e., concrete surface) from standing height was determined. We found that this force decreases up to 36%, depending on how they land on the ground.
This study quantified how rigid foot plates of different length altered individual foot segment kinematics during walking. The foot plates impacted most segment ranges of motion. The greatest changes were seen for toe and forefoot dorsiflexion.
In the current study, a combined experimental and computational approach to investigate the effect of individual lumbar vertebral postures on lumbar spine injury risk under high-speed vertical acceleration was conducted. Specimen-specific finite element (FE) models of 3-segment functional spinal uni...
The purpose of this study was to determine the effect load carriage has on natural ankle quasi-stiffness (NAS). Fourteen college-aged healthy individuals underwent an instrumented gait analysis while walking over ground at 0.8 statures/second (st/s) under three load carriage conditions. Data were an...
“Bicycle-fit” is an interactive process aimed at changing bicycle parameters to achieve desired kinematics. Despite widespread “rules-of-thumb”, there is no research investigating the effect of how changing bicycle-fit affects lower extremity kinematics. This investigation found that only kn...
Greater shoe midsole bending stiffness has been shown to improve jump height during single leg maximal jumping, however, this improved performance may come at the cost of increased Achilles tendon (AT) injury risk from greater AT strain. We calculated participant-specific AT strain during maximal co...
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