When humans hop in place or run forward, leg stiffness is increased to offset reductions surface stiffness, allowing the global kinematics and mechanics remain same on all surfaces. The purpose of present study was determine mechanism for adjusting stiffness. Seven subjects hopped surfaces different stiffnesses (23–35,000 kN/m) while force platform, kinematic, electromyographic data were collected. Leg approximately doubled between most stiff least surface. Over range surfaces, ankle...

The purpose of the current study was to investigate whether adaptations stride length, frequency, and walking speed, independently influence local dynamic stability size medio-lateral backward margins during walking. Nine healthy subjects walked 25 trials on a treadmill at different combinations consequently speeds. Visual feedback about required actual combination frequency length given trials. Generalized Estimating Equations were used independent contribution speed measures gait...

It has frequently been proposed that lowering walking speed is a strategy to enhance gait stability and decrease the probability of falling. However, previous studies have not able establish clear relation between stability. We investigated whether people do indeed lower when challenged, this reduces Nine healthy subjects walked on Computer Assisted Rehabilitation ENvironment (CAREN) system, while quasi-random medio-lateral translations surface were imposed at four different intensities. A...

The objective of this study was to assess how wearing a passive trunk exoskeleton affects metabolic costs, movement strategy and muscle activation during repetitive lifting walking. We measured energy expenditure, kinematics activity in 11 healthy men 5 min walking with without exoskeleton. Wearing the lifting, costs decreased as much 17%. In conjunction, participants tended move through smaller range motion, reducing mechanical work generation. Walking exoskeleton, increased up Participants...

Besides a stable gait pattern, in daily life requires the capability to adapt this pattern response environmental conditions. The purpose of study was elucidate anticipatory strategies used by able-bodied people attain an adaptive and how these interact with maintain stability. Ten healthy subjects walked Computer Assisted Rehabilitation ENvironment (CAREN). To provoke had hit virtual targets, markers guided their knees, while walking on self-paced treadmill. effects without task speed, step...

Abstract Objective This cross-sectional study examined associations between wheelchair sprint and anaerobic power (measured in the lab) mobility performance field) among two groups of tennis players. Additionally, construct validity was assessed for both lab field tests. Design Nine amateur nine elite players performed a Sprint Wingate test on ergometer Sprint, Illinois Spider field, with inertial measurement units their wheelchairs. Associations were using regression analyses, an...

Background: The effect of total ankle replacement on gait is not fully known in terms joint kinematics, ground reaction force, and activity the muscles lower leg. Methods: A comparative study was done 10 patients after uneventful unilateral mobile-bearing healthy controls. rigid body model used to describe motion knee three-dimensional ankle-hindfoot complex during barefoot walking. An opto-electronic analysis system analyze bilateral movement patterns, synchronized with recordings...

The aim of this study was to assess the functional effects and mechanical contribution Ankle Foot Orthoses (AFO) prescribed overcome drop-foot gait. We hypothesized that poor AFO relate insufficient during swing phase, or unwanted constraining ankle stance phase. In seven patients with Stroke Multiple Sclerosis, we determined changes in energy cost walking resulting from wearing an AFO, as a measure effects. addition, instrumented gait analysis performed, properties were measured, calculate...

Abstract Purpose Determinants of successfully introducing passive exoskeletons in the working environment to decrease mechanical loading on back, are acceptability device management and employees, including self-efficacy employees when using device. Therefore, aim this study was assess with low-back pain an exoskeleton such a these their managers. Methods We used mixed method approach. quantitatively assessed change 17 performing daily activity tasks exoskeleton, modified spinal function...

Regular physical activity is important for people with tetraplegia to maintain fitness but may not always be easily integrated into daily life. In many countries, hand cycling has become a serious option mobility in tetraplegia. However, little information exists regarding the suitability of this exercise mode population.The purpose study was evaluate effects structured cycle training program individuals chronic tetraplegia.Pretraining and posttraining outcome measurements capacity were...

To determine the relationship between isometric leg muscle strength and mobility capacity in children with cerebral palsy (CP) compared to typically developing (TD) peers.Participants were 62 CP (6-13 years), able walk (n = 10) or without 52) walking aids, 47 TD children. Isometric of five groups was measured using hand-held dynamometry. Mobility assessed 1-min walk, 10-m sit-to-stand, lateral-step-up timed-stair tests.Isometric reduced 36-82% TD. When adjusted for age height, percentage...

The asymmetry in step length prosthetic gait is often seen as a detrimental effect of the impairment; however, this also might be functional compensation. An advantage smaller nonprosthetic leg, and specifically foot forward placement (FFP), that it will bring center mass closer to base support leading thus increase backward margin stability (BW MoS).The purpose study was characterize differences length, FFP, concomitant difference BW MoS between steps legs (referred steps, respectively)...