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Chiari type I malformations (Chiari I) are congenital deformities characterized by migration of the cerebellar tonsils through the foramen magnum. The condition is associated with headaches, chronic fatigue syndrome, orthostatic intolerance, and other neurologic syndromes. Despite patients’ descri...
With great interest to the sports world, impressive performances in Athletics have drawn an interest in the gathering of kinematic data on the performances of the world’s elite competitors. This study serves as the platform in presenting biomechanical performance analysis in Athletics at the colle...
Lesser quadriceps function is moderately associated with longer periods of support during gait in individuals with obesity. Further work is needed to evaluate if increasing quadriceps function in individuals with obesity will improve temporal gait characteristics associated with postural instability...
A kinematic analysis of vaulting in comparison with normal walking was performed as 20 participants walked over level ground with and without a brace restricting knee flexion on the right side. It was determined that vaulting results in significantly different plantarflexion and dorsiflexion ankle a...
The purpose of this study was to quantify the individuality of knee kinematics during running by examining the level of similarity between closely matched runners. Our results suggest that it becomes easier to identify similar runners as the size of a candidate pool increases; however, there is a li...
Joint mobility plays a part in the performance of competitive sports. It can be used as a training or as a warm-up exercise alone. Good joint mobility can produce better power transmission and exert better competitive level. On the contrary, it may change movement pattern that produce more force on ...
This study aimed to evaluate the activation of the three regions within the infraspinatus muscle during isometric external rotation (ER) exertions while the arm was positioned in different elevation postures. Superior and middle region of the infraspinatus showed similar activations irrespective of ...
We previously reported that a longer knee extensor moment arm (MA) is associated with better sprint performance because of increase in knee extensor torque during sprinting. In contrast, a shorter MA is a useful in decreasing energy consumption in muscles, potentially by mitigating the length change...
A transient period of accelerated relaxation occurs when mammalian muscle is repeatedly stimulated. We aimed to determine if a similar effect occurs during repetitive stimulation of frog plantaris muscle. The existence of this effect would provide insight into the mechanisms controlling the rate of ...
To study muscle adaptation mechanisms, e.g. during growth, ageing or disease, reliable measurements of muscle architecture are required. Diffusion tensor imaging (DTI), combined with DTI tractography, can provide three-dimensional reconstructions of the architecture of whole human muscles. Here, we ...
Although knee injury is common among soccer players, limited research on risk of injury exists. This study examined core endurance and strength in thirty-nine professional male soccer players and recorded knee injuries experienced throughout the following season. Prone-bridge, side-bridge, trunk fle...
Spine kinematics are often recorded in vivo by tracking motion of multi-segment regions (e.g. T12 to S1). Many models of the spine must distribute T12/S1 motion across segmental levels, commonly by assuming linear proportions. This raises concern when modelling non-sagittal plane movements as 3-D an...
We present a systematic source of error affecting the measurement of optoelectronic stereophogrammetric sys-tems (OSS), hereinafter called the camera occlusion arte-fact (COA). The COA takes place when the view of a mark-er is partially or completely occluded to one or more cam-eras. In these condit...
Kinetic data acquired from force plates embedded in moving platforms naturally contain artifacts called inertial components; however, their removal requires knowledge of the system’s inertial properties. Our objective was to: develop a method for estimating the inertial properties and force plate ...
This study is in the first year of a four year case study that will quantitatively assess the risk of lower extremity injuries, especially those to the knee. Seven healthy female NCAA soccer players from Valparaiso University were evaluated on their preseason and postseason functional movements. In ...
This study investigated the effect of polycarbonate-urethane (PU) interpositional knee spacers on load distribution in 3D printed knee models under the consideration of a potential treatment for knee osteoarthrosis (KOA).
Walk is an economic activity, as more efficient mechanical contribution, less is necessary from metabolic input. Patients with chronic heart failure (CHF) and hear transplanted (HT) present peripheral musculoskeletal disorders, dyspnea and fatigue in their activities. Objective: to verify the associ...
This study investigated the relationship between ratio of vastus medialis (VM) to vastus lateralis (VL) muscle thickness and the knee valgus angle at initial contact during single-leg landing. Ultrasound images of VM and VL were obtained from thirteen healthy subjects. All subjects performed single-...
An accurate method to analyze shoulder kinematics in a clinical setting is needed in order to optimize treatment. The purpose of this study was to determine the reliability and accuracy of kinematics derived from 2D assessment of single plane fluoroscopy images compared to kinematics from 2D/3D shap...
We propose a damped harmonic oscillator model of the acceleration of the center of mass during a medial drop landing to measure dynamic stability in subjects with functional ankle instability. We found construct validity of the model to be good. The damping coefficient in the model significantly cor...
Equine third metacarpal (MC3) bones experience a range of surface strains which are a measure of displacement induced by mechanical loading. It is, therefore, desirable to develop an efficient, yet accurate, model in which the mechanical loading of MC3 is obtained via the induced displacement and st...
Lower extremity stance phase peak joint moments were compared for people with a unilateral transtibial amputation (TTA) running with daily-use (DUPs) and running-specific prostheses (RSPs). RSPs generated greater plantarflexion moments due to their design. Prosthetic limb knee and hip extension mome...
The study of the coordination of classical ballet dancers is of great relevance because this group does activities that can generate a higher asymmetric overuse in certain joints or muscles. The aim of this study is to evaluate the coordination variability in the classical ballet dancers during runn...
High knee flexion postures, despite their association with increased joint loading, are frequently adopted in occupational childcare. This study sought to quantify the frequency and depth of high knee flexion postures adopted by childcare workers in order to evaluate their increased risk of knee ost...
Recent work suggests that kinematics-based electrical stimulation can restore trunk stability following neuromuscular impairment. However, knowledge of the relation between body motion and muscle activity during unstable sitting may be beneficial. Our objective was to quantify the spatial and tempor...
Children and adults with cerebral palsy develop impairments termed contractures that dramatically reduce their function, making activity and participation in the society difficult. An improved understanding of the muscle specific causes for contracture development are needed to develop targeted ther...
The present study was aimed to investigate effects of kinematics of the knee and hip joints on energy cost during supporting phase in different slope running. Twelve male middle- and long-distance runners were asked to run for three minutes on a treadmill at the speed of 13.5 km/h under three differ...
Studying purpose was to assess the relation between trunk and foot COP at the cocking phase during pitching motion. Subjects were 22 healthy men. We measured using goniometer and electronic vernier caliper at the cocking posture the horizontal abduction angle of humeral articulation (HABD), scapula ...
Within- and between-day reliability and minimal detectable differences for select knee joint angles measured during running were determined. Knee joint variables demonstrated good to excellent within- and between-day reliability.
Current assessments of pectus deformities use highly subjective, low precision calipers and may require exposure to ionizing radiation. This study demonstrates the high reliability of a low cost commercially available 3D scanning and custom measurement technique for non-invasive assessment of pectus...
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