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A recent survey in India reported a point prevalence of 43.5% low back pain among dancers amongst which a large majority were Indian classical dancers namely, Bharatanatyam. In an attempt to explore the source of low back pain, 7 Bharatanatyam dancers presenting with low back pain during walking wer...
The effect of a secondary blocking action on the primary long snapping action was tested in this study. Comparison of reaction forces (RFs) and linear impulse revealed that players increased posterior RF while maintaining resultant RF with a secondary blocking action. A larger posterior linear impul...
This study aimed to identify differences in contact force pathways at the interface between the acetabular cup and femoral head. We have observed different locations of peak contact forces for different activities of daily living, which could lead to different wear rates in patients depending on act...
The influence of heel pad and shoe mechanical properties on the ground reaction forces were examined during the impact phase of running. Heel pad mechanical properties were measured in cadaver heel pads under a range of conditions reflecting how the heel pad can be surrounded in a shoe. These mechan...
Maximal back extension force of the participants was measured using a dynamometer while standing barefoot and on top of two insole conditions (AUTO and DELTA insoles). Only DETLA insole demonstrated a significant positive effect on back strength. We found that most subjects improved their force prof...
Femoroacetabular impingement (FAI) syndrome has been related to joint and muscle adaptations. Three different FAI patient age groups had their range of motion (ROM), strength and functionality compared. Although hip ROM and functionality were similar between groups, muscle strength was smaller for e...
Cervical spine kinematics obtained from four in vitro loading conditions were compared to in vivo kinematics with respect to the instantaneous center of rotation (ICR).
The purpose of the current study was to investigate an effect of spin or velocity of the pitched ball on distance of the hit ball experimentally using comparison of fastball with curveball. Six male baseball players belonging to Toto University baseball league participated in the current study. The ...
Achilles tendon (AT) moment arm (ATMA) was measured in vivo during running by combining motion capture and ultrasound (US) data. Results were compared to tendon excursion and regression equation ATMA values, and the effect of using different ATMA values on Achilles tendon force established. All meth...
Young healthy adults performed rapid isometric force pulses with individual fingers in two directions (force generation and relaxation), and from three initial force levels. Force-rate enslaving was computed to quantify finger interdependence. The ring finger is the most enslaved, force-rate enslavi...
We applied a PCA-based technique to extract functional movement components and the corresponding activity of the neuromuscular controller from kinematics data in people with DS. Specific abnormalities were found in frontal-plane control.
Postural control and balance are challenging tasks for lower limb prosthesis users due to the absence of somatosensory data from the amputated side and limitation of a prosthetic device in comparison to the natural lower limb. A study was developed to evaluate the standing balance of above-knee pros...
Musculoskeletal models of a person with a unilateral transtibial amputation were developed to investigate hip joint contact force (HJCF) during running using running-specific and daily-use prostheses. Peak HJCF was greater in the intact leg compared to the amputated leg for both types of prostheses....
Finite element models have been used to study the mechanical responses of the equine hoof. The hoof is made up different tissues, including the sole, flexor and extensor tendons, frog, navicular bone, middle phalanx, hoof wall, distal phalanx, laminar junction, and digital cushion [1]. These tissues...
This study determined the impact of different ankle braces on both sexes’ knee biomechanics during a single-leg cut. With the lace-up brace, both sexes altered knee biomechanics that may impact knee injury risk during the cut. All participants decreased peak knee internal rotation angle, while fem...
The initiation and propagation of cranial fracture following blunt impact remain poorly understood. To evaluate the significance of intrinsic skull properties on remote fracture initiation, computational models of representative specimens were tested under a variety of extrinsic impact conditions an...
Subject-specific lateral trunk lean (LTL) gait modification (GM) decreased knee abduction moment (KAM) magnitude on average by 8.9%, although not statistically significant. There was a concurrent increase in trunk kinetics, which is indicative of increased spinal loading. Over prolonged periods, exp...
This study aimed to identify site- and direction-dependent differences in mechanical properties of the triceps surae aponeuroses in vivo during graded isometric submaximal plantar flexion using shear wave elastography. The stiffness of triceps surae aponeuroses was higher at proximal site in the lon...
Primary cilia length was measured ex vivo in 3D after wild type and itg?1-null chondrocytes were exposed to iso- or hypo-osmotic stress. We show that integrin ?1?1 is necessary for primary cilia lengthening following hypo-osmotic stress.
The present work characterized the variability of postural reactions induced by mechanical vibration of ankle tendons. Posturography measures were obtained with a forceplate on thirty healthy adults. Overall, results denoted a high level of measurement error (intra-subject variability), but good to ...
Functional Movement Screen (abbreviation: FMS) has been widely used to assess physical asymmetry for athletes. This study aimed to assess the FMS score and compare the differences between volleyball and track and field athletes. The results were found that more volleyball players got a lower score i...
Grounded running is slow running without a flight phase. When young, athletic men changed their spontaneous running pattern – containing a flight phase – to grounded running, musculoskeletal and impact loading decreased. However, no information is available for runners who spontaneously perform ...
In this study, hip torques in the transverse plane were analysed during the side-walk exercise with elastic resistance. Besides showing that the resistance offered by the elastic band does not seem to agree with commonly set goals of hip rehabilitation, our results show that torque outputs and and t...
With prescription of a carbon-fiber Intrepid Dynamic Exoskeletal Orthosis (IDEO), patients receive specialized functional training. Presumably, this increases the capacity to perform work in the brace and decreases demand in the remaining lower extremity constituents. By looking at the absolute brac...
Differences in head accelerations between blunt impacts performed on a linear impactor and monorail were compared across impact locations and velocities. Difference scores varied by impact location, but seem to be highly specific and non-generalizable across locations and velocities.
This study was designed to understand the influence of a spine self-mobilization exercise program on postural stability in the antero-posterior (AP) and medio-lateral (ML) directions. The center of pressure (CoP) was quantified while young healthy adults were standing with eyes open and closed. Resu...
Deletion of titin kinase form healthy skeletal muscle impairs the ability of the muscle to adapt to passive tension. The lack of sarcomereogenesis to abrogate passive tension indicates titin kinase plays an essential role in myocyte adaptations to stress.
We combined experiments and predictive simulations to explain the large intra-subject variability observed in the kinematic responses to backward perturbations of standing balance when randomly administered within a set of multi-directional support-surface translations and rotations. We found that c...
Running gait retraining (GR) can alter running technique and lower limb loading patterns. The aim of the study was to examine bilateral changes in foot angle after a GR intervention that targeted running with a flatter foot. Five rearfoot strikers undertook six GR sessions whilst receiving an intern...
While collagen is believed to be a major passive load bearing structure in muscle, previous work reports a very weak correlation between muscle collagen content and passive stiffness [1,2]. This may result from a lack of appreciation of intramuscular anatomical variations among muscle fibers and con...
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