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The angle of th joint is important information to grasp the exact state of the joint in the human body. In this study, we measured the angular displacement using the optical signal change according to the joint angle change, unlike the conventional joint measurement method.
A systematic review and meta-analysis were performed to investigate neuromuscular changes after Tai Chi Practice. Healthy old Tai Chi practitioners demonstrated lower muscle latencies and longer muscle activation times during reaching tasks.
The margin of stability (MoS) is often quantified relative to an intended walking direction. This approach may not be suitable when the intended direction is altered, variable, or unknown. The purpose of this study was to describe and validate the approach of calculating the lateral minimum MoS rela...
Upright human standing requires stabilization of both translational and rotational degrees-of-freedom in the sagittal plane that is primarily accomplished by coordination of joint torques at the hip, knee, and ankle. Those torques produce the ground-on-foot force (F) which has recently been shown to...
Regular papers should present novel perspectives within the general scope of the conference. Short papers (Work-in-Progress) are an opportunity to present preliminary or interim results. Posters are intended for ongoing research projects, concrete realizations, or industrial applications/projects pr...
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The foot medial-longitudinal arch (MLA) is perhaps the most important feature characterizing foot morphology. Current MLA models based on skin-markers for motion analysis allow non-invasive assessment of foot arch shape and deformation, but little is known on their anatomical accuracy and repeatabil...
We aimed to clarify the speed and accuracy in center of mass (COM) control during anticipatory postural adjustment (APA) and step phases in a step task where different levels of accuracy were required. Twelve subjects stepped onto stayed on bars with 2, 4, 6, and 8 cm width. The ground reaction forc...
A 6000% increase in the number of finite element papers published between 1980 and 2009 has been reported [1]. However, finite element convergence and error analysis have not been adequately addressed in the literature. In this study, fundamental relations of finite element convergence analysis were...
We compared posturography and Achilles tendon shear wave speed measures during quiet standing in healthy young adults. We found that wave speed closely tracks fluctuations in the center of pressure, an observation attributable to the direct relationship between wave speed and tendon loading. Both te...
We used switched linear dynamical systems (SLDS) to model joint angle trajectories of healthy individuals walking on a treadmill with and without functional electrical stimulation (FES). We tested the ability of the SLDS models to reproduce the kinematic trajectories based on measured the joint angl...
The mechanical impedance of active muscle affects the stability of musculoskeletal systems to perturbations. Following a recent experimental finding, we have developed a three filament muscle model in which myosin loads titin when shortening and clutches onto titin during lengthening. A virtual acti...
We developed a single body-mounted sensor that integrates a 3-axis accelerometer, 3-axis gyroscope, 3-axis magnetometer, barometer, and GPS. The sensor accurately computes speed, acceleration, location, angular velocity and angular orientation at 400 Hz. Steps are also segmented and metrics computed...
The absolute and normalized rate of torque development (RTD) of knee extensors were measured to investigate the interactions between angle-torque and angle-RTD relationships. Eighteen men performed maximal isometric explosive contraction (MIC) of knee extensors at the angles K, K-15°, K-30°, K+15...
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Many surveyed freefall jumpers report musculoskeletal neck pain. This study measured a jumper’s head and body accelerations during parachute opening shock and reported the mean, standard deviation, and range of the accelerations. Data were collected from 18 members of the U.S. Army Parachute Team,...
This study examines the discrepancy between an assumed neutral-zero position and the actual posture of the lower extremity of young and elderly subjects during the calibration process of an IMU system. The joint angles were calculated using a marker based optical motion capture system. The results s...
Magneto-Inertial technology is an established alternative to optical motion capture for studying human movement. However, accuracy of its orientation estimation is still an open issue. In this study, we performed a concurrent validation of four common sensor fusion algorithms at three different spee...
Inertial Measurement Units (IMUs) became extremely popular for human motion analysis in the free-living environment thanks to their small size, lightweight, and long battery life [1,2]. However, IMU measures the acceleration and angular velocity in its sensor-fixed frame (SF), not the anatomical fra...
Rehabilitation following anterior cruciate ligament (ACL) injury may be facilitated by a greater understanding of ACL force during activities used to prepare athletes for return to sport. Peak ACL tension and ACL impulse were compared among 40 recreational athletes during 8 rehabilitation activities...
Energy dissipation in the foot, may lead to damaging soft tissue temperature increases in at-risk individuals. We developed a standardized system for semi-automatically measuring regional temperature changes on the plantar surface following walking. This system is utilized in a cohort of three healt...
Tripping-related falls frequently occur at minimum foot clearance (MFC) and cause forward balance loss. In contrast, backward falls often result from slips at heel contact (HC). Previous studies have examined dynamic balance in isolated anteroposterior and mediolateral directions. The present study ...
The ability to measure whole body vibration exposure in the workplace is important considering its established link to low back pain. We designed and evaluated a wearable device for measuring vibration exposure at the lower back. Experiments were performed on an electromechanical shaker to compare v...
Abstract for international astronomy symposium
Decline in postural control and balance is an established risk factor contributing to falls in older population. An accuracy and affordable assessment device would be beneficial for investigating postural and balance performance which then refer to falls risk management. We examined a) the correlati...
We compared movement accuracy and smoothness during goal-directed reaching movements in myoelectric prosthesis users and able-bodied controls. We measured movement accuracy as the distance error in matching a virtual target and quantified trajectory smoothness as the spectral arc-length (SPARC). Mov...
The purpose of this study was to validate the accuracy of MilestonePod (MSP) wireless running sensors and IMeasureU inertial measurement units with custom algorithms (IMU) for subjects wearing combat boots while walking and running. Results indicate that in general, the IMU demonstrates large inaccu...
A continuously moving axis of rotation yields Achilles tendon moment arms that differ from those found using a single fixed axis derived from ankle motion, but those differences occur only at the dorsiflexion end of the range of motion.
Despite the growing amount of literature suggesting a greater reliance on visual information and cognitive processing following an anterior cruciate ligament reconstruction (ACLR), no known study has investigated the interplay between cognition and visual feedback in an ACLR population. The purpose ...
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