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The purpose of the present investigation was to examine the influence of footwear on walking stability. Twenty healthy women walked at 1.3 m/s on an instrumented treadmill. One hundred steps (50-right, 50-left) were analyzed from two walking conditions (shod, unshod). The variability of the centre o...
The purpose of the study was to examine the influence of footwear on loading rate and joint kinematics during walking. Nineteen healthy females walked on an instrumented treadmill at 1.3 m/s. Ten strides (10-right, 10-left) were analyzed for two walking conditions (shod, unshod). Loading rate and jo...
NBD expanded internationally from the US to 16 countries in 3 years to increase Biomechanics’ societal impact. Here we describe our rapid growth through the events in 5 nations for the purpose of showing others how they can participate in this worldwide celebration of Biomechanics.
We aimed to find a relationship between mechanical stiffness and hysteresis of equine SCB, and in vivo fatigue-induced microdamage. We found mechanical properties of cartilage-bone were associated with the damage volume of the specimens and were significantly different between specimens with and wit...
The purpose of this study is to classify the spinal curvature in a cross-legged sitting posture. The sitting position was defined as three positions (flat, lordosis, and slump) considering the spinal curvature. In this study, we developed a classification algorithm that reflects the characteristics ...
A brace limiting knee flexion was used to isolate the contributions of stiff-knee gait on contralateral limb loading during walking. Our results suggest that a fixed knee condition during stiff-knee gait does not increase contralateral lower limb joint loading, supported by observations of reduced p...
The use of signal classification techniques to accurately classify¶ activities of daily living has gained importance in assistive¶ technologies. The aim of this paper was to implement different¶ classification techniques to identify user intent from inertial¶ measurement units (IMUs) attached to...
Acquiring the shape of foot plantar surface is critical to perform anatomical measurements, for objective diagnosis of foot morphological alterations and to design custom orthotics and footwear. Whereas laser scanners are currently the gold-standard for accurate 3D digitization of body parts, these ...
Motion capture systems are useful tools for assessing different aspects of human movement. 3D systems are the preferred method as they utilize multiple cameras to gather accurate and reliable measurements. They can be cost-prohibitive and complex to use. In the absence of a 3D system, a 2D system ca...
Large force variability is a potentially unique signature of spastic muscle that can be estimated using analysis of the force trace during voluntary contractions. Underlying mechanisms of force variation remain largely unknown. However, recently reported findings indicates changes in motor unit disc...
The effect of infant positioning on the neck, back and lower limb muscle activity (2-6 months) was explored. Surface EMG data while lying prone was compared to lying supine, held in arms, in a baby carrier, and in a car seat. Infants exhibited significantly lower muscle activity in the car seat, com...
Examining how different kinds of in-game special visual effects influence the performance of music game players. According to the results, the brightness of effects influenced more than the size of effects, and the influence could be reduced by promoting proficiency.
We have engineered the first animal models to study Freeman-Sheldon Syndrome (FSS) by expressing transgenic myosin containing FSS-causing point mutations Y583S and T178I in Drosophila. We studied the mutations’ effects on indirect flight muscle (IFM) and jump muscle mechanical properties to elucid...
The in vivo knee joint kinematics of five different knee implant designs were analysed during level walking and stair descent using moving videofluoroscopy. Even though individual motion characteristics were observed between subjects, especially in less constrained designs, different implant feature...
Most frequent ligament injuries at the lower limb occur at the ankle and, despite the numerous studies, controversies still exist regarding their stabilizing function. Furthermore, the functions of some ligaments are still unknown because of access difficulties. Therefore, the aim of this study was ...
Many investigations have been performed to understand the biomechanical relationship using biosignal. Surface EMG (sEMG) signal is particularly interesting part for human rehabilitation system in order to detect the gait intention and widely studied in the field of rehabilitation system. Intention d...
Quantitative measures related to mechanical strength of the anterior cruciate ligament (ACL) graft are needed for timely return-to-sports decisions after the ACL reconstruction surgery (ACLR). Ultra-short echo-time (UTE)-T2* magnetic resonance imaging (MRI) was used to study structural changes in gr...
The objective of this study was to evaluate the accuracy of a commercially available low cost inertial motion capture system (IMC). Four subjects equipped with seventeen inertial measurement units (IMU) performed manual handling of boxes for about 35 minutes. An optoelectronic system was used as a g...
The purpose of this research was to validate wireless inertial sensor measures of hip joint orientation during dynamic tasks. Inertial sensor derived hip joint angles (found using acceleration, angular velocity, and magnetic field data) are compared to those found using a 3D camera-based laboratory ...
In this pilot study, five recreationally trained men performed 5-second isometric contractions in four different deadlifting positions to determine the optimal position for maximal lower-body muscle activation. A graded response was found, with the start position eliciting the greatest muscular acti...
Cognitive load associated with dual-tasking while walking is known to affect balance and increase fall risk. The objective of this study was to quantify the effect of cell phone usage on head stability during walking.
This work examined the performance of a hand-tracking task prior-to and following either wrist flexor or extensor isometric fatigue. Wrist extension and flexion force decreased equally following fatigue. Tracking error was significantly greater immediately following fatigue compared with baseline, b...
This study uses inertial sensors to analyze foot clearance and its relation to two gait conditions (walking and running) while traveling on stairs (ascent and descent). Our study found that during stair ascent, clearance is significantly larger when running. This finding suggests that humans use the...
A child with hemiplegic cerebral palsy (CP) who has stiff knee gait (SKG) was trained by real-time feedback on his knee joint pattern during treadmill walking. The participant’s knee flexion angle increased remarkably in the first feedback trial and this change was maintained in the same training ...
Double-bundle (DB) anterior cruciate ligament (ACL) reconstruction is thought to improve kinematic outcomes after ACL reconstruction. Using a dynamic stereo X-ray (DSX) system, the side-to-side (SS) kinematic differences between 29 single bundle (SB) and 28 DB ACL reconstructed participants during d...
Erroneous conclusions about game effects may be made when game simulations or laboratory-based fatigue protocols are used, due to the task-dependent effects of fatigue. This study was the first to investigate how playing an elite U20s basketball game alters trunk control during an anticipated cut ta...
Walking deficits are common following stroke, yet typically used clinical and functional assessments fail to adequately identify their source. We previously developed a Comprehensive Locomotion Index (CLI) that uses objective measurements and differentiates functional status among individuals with c...
Participants’ kinematics were collected using two motion capture systems (Xsens (inertial), Vicon (optical)) while performing a series of occupationally-relevant military-based movements. Principal component analysis (PCA) was used to detect variance within the three-dimensional marker trajectorie...
In order to study dynamic balance of stance phase during self-paced walking, variations in orthogonal ground reaction forces (GRF) were examined by using force-plate installed dual belt treadmill. As walking speed increased, standard deviations (SDs) in GRFs tended to be higher both at the beginning...
Motor control dysfunction in the lumbar spine may alter in the muscle function of deep muscles such as transverse abdominal (TrA) and multifidus (MF). Previous studies have shown that sub-sensory stochastic resonance (SR) stimulation may improves balance and the sensitivity of specific mechanorecept...
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