Biomechanical Effects of Different Footwear on Steady State walking

2016 ◽  
Vol 5 (1) ◽  
pp. 9-20
Author(s):  
Saad Jawaid Khan ◽  
Abu Zeeshan Bari ◽  
Soobia Saad Khan ◽  
Muhammad Tahir Khan
Keyword(s):  
Steady State ◽  
Sagittal Plane ◽  
Transverse Plane ◽  
Metabolic Energy ◽  
Joint Moments ◽  
Gait Parameters ◽  
Subjective Preference ◽  
Spatial Parameters ◽  
The Subject ◽  
Work Done

The objective of this work is to evaluate the biomechanical effects of footwear on steady state walking of a user. An initial subjective preference of the footwear was identified which was validated biomechanically in relation to the kinetic parameters of gait. The subject underwent 3D gait analysis (using VICON Motion Capture System, UK) under four conditions: barefoot, with formal shoes, with casual shoes and with sandals. ANOVA and Paired t-test of Temporal Spatial Parameters (TSP), joint powers and joint moments (a = 0.05), for the four conditions in sagittal plane showed that there were significant differences found in TSP's, joint moments and work done, but not in joint powers. The behaviour of formal shoes was significantly different in the frontal and transverse plane moments and had the most profound effect on the joints. Although several hypotheses on the implications of footwear on the gait parameters are proposed, these require further investigation, supplemented with electromyography (EMG) and metabolic energy measurements for a larger population.

scholarly journals Sagittal and Frontal Plane Gait Initiation Kinetics in Healthy, Young Subjects

2019 ◽  
Vol 67 (1) ◽  
pp. 85-100
Author(s):  
Andrew W. Smith ◽  
Del P. Wong
Keyword(s):  
Steady State ◽  
Sagittal Plane ◽  
Center Of Mass ◽  
Reaction Force ◽  
Frontal Plane ◽  
Step Test ◽  
Gait Initiation ◽  
Joint Moments ◽  
Plane Component ◽  
Young Subjects

AbstractThe study purposes were to record the lower extremity sagittal and frontal joint moments and powers during gait initiation (GI); evaluate GI support moments in both planes; and analyze planar energy patterns in a group of 15 healthy, young adults. 3D motion and ground reaction force data were used to calculate support moments (SM) and joint moments and powers as well as center of mass (COM) kinematics. STEP1 had no visible SM. It appeared in STEP2 and, by STEP3, resembled that seen in steady-state gait. Joint moments demonstrated a similar development towards typical patterns over the three steps. Correlations of moment data between planes indicate that the frontal plane component of the SM acts to keep the COM centered. It is suggested that Winter’s 1980 SM definition be extended to include both a support (sagittal) component and a centering (frontal) component. Energy was calculated for individual bursts of joint powers in both planes and each step had characteristic patterns in each plane, with patterns resembling steady-state gait appearing in the third step. Test-retest reliability (ICC range: 0.796 – 0.945) was high with CV values in the sagittal plane (36.6 – 37.5%) being less variable than in the frontal plane (39.0 – 82.0%). COM kinematics revealed that acceleration peaked in STEP2 (ICC range: 0.950 – 0.980, CV < 20.0%). Data supported hypotheses regarding the dominance of the frontal plane power in STEP1, with substantial power coming from hip flexors. As well, powers in the sagittal plane were generally of larger magnitude than in the frontal plane.

scholarly journals Biomechanics of overground vs. treadmill walking in healthy individuals

2008 ◽  
Vol 104 (3) ◽  
pp. 747-755 ◽  
Author(s):  
Song Joo Lee ◽  
Joseph Hidler
Keyword(s):  
Muscle Activity ◽  
Muscle Activation ◽  
Sagittal Plane ◽  
Knee Extensor ◽  
Treadmill Walking ◽  
Overground Walking ◽  
Joint Moments ◽  
Muscle Activation Patterns ◽  
Gait Parameters ◽  
Leg Kinematics

The goal of this study was to compare treadmill walking with overground walking in healthy subjects with no known gait disorders. Nineteen subjects were tested, where each subject walked on a split-belt instrumented treadmill as well as over a smooth, flat surface. Comparisons between walking conditions were made for temporal gait parameters such as step length and cadence, leg kinematics, joint moments and powers, and muscle activity. Overall, very few differences were found in temporal gait parameters or leg kinematics between treadmill and overground walking. Conversely, sagittal plane joint moments were found to be quite different, where during treadmill walking trials, subjects demonstrated less dorsiflexor moments, less knee extensor moments, and greater hip extensor moments. Joint powers in the sagittal plane were found to be similar at the ankle but quite different at the knee and hip joints. Differences in muscle activity were observed between the two walking modalities, particularly in the tibialis anterior throughout stance, and in the hamstrings, vastus medialis and adductor longus during swing. While differences were observed in muscle activation patterns, joint moments and joint powers between the two walking modalities, the overall patterns in these behaviors were quite similar. From a therapeutic perspective, this suggests that training individuals with neurological injuries on a treadmill appears to be justified.

Digital Biomarkers of Cognitive Frailty: The Value of Detailed Gait Assessment Beyond Gait Speed

Gerontology ◽  
2021 ◽  
pp. 1-10
Author(s):  
He Zhou ◽  
Catherine Park ◽  
Mohammad Shahbazi ◽  
Michele K. York ◽  
Mark E. Kunik ◽  
...  
Keyword(s):  
Older Adults ◽  
Steady State ◽  
Dual Task ◽  
Gait Speed ◽  
Stride Length ◽  
Cognitive Frailty ◽  
Single Task ◽  
Double Support ◽  
Gait Parameters ◽  
Digital Biomarkers

<b><i>Background:</i></b> Cognitive frailty (CF), defined as the simultaneous presence of cognitive impairment and physical frailty, is a clinical symptom in early-stage dementia with promise in assessing the risk of dementia. The purpose of this study was to use wearables to determine the most sensitive digital gait biomarkers to identify CF. <b><i>Methods:</i></b> Of 121 older adults (age = 78.9 ± 8.2 years, body mass index = 26.6 ± 5.5 kg/m<sup>2</sup>) who were evaluated with a comprehensive neurological exam and the Fried frailty criteria, 41 participants (34%) were identified with CF and 80 participants (66%) were identified without CF. Gait performance of participants was assessed under single task (walking without cognitive distraction) and dual task (walking while counting backward from a random number) using a validated wearable platform. Participants walked at habitual speed over a distance of 10 m. A validated algorithm was used to determine steady-state walking. Gait parameters of interest include steady-state gait speed, stride length, gait cycle time, double support, and gait unsteadiness. In addition, speed and stride length were normalized by height. <b><i>Results:</i></b> Our results suggest that compared to the group without CF, the CF group had deteriorated gait performances in both single-task and dual-task walking (Cohen’s effect size <i>d</i> = 0.42–0.97, <i>p</i> &#x3c; 0.050). The largest effect size was observed in normalized dual-task gait speed (<i>d</i> = 0.97, <i>p</i> &#x3c; 0.001). The use of dual-task gait speed improved the area under the curve (AUC) to distinguish CF cases to 0.76 from 0.73 observed for the single-task gait speed. Adding both single-task and dual-task gait speeds did not noticeably change AUC. However, when additional gait parameters such as gait unsteadiness, stride length, and double support were included in the model, AUC was improved to 0.87. <b><i>Conclusions:</i></b> This study suggests that gait performances measured by wearable sensors are potential digital biomarkers of CF among older adults. Dual-task gait and other detailed gait metrics provide value for identifying CF above gait speed alone. Future studies need to examine the potential benefits of gait performances for early diagnosis of CF and/or tracking its severity over time.

Sensitivity of Intersegmental Angles of the Spinal Column to Errors Due to Marker Misplacement

2015 ◽  
Vol 137 (7) ◽  
Author(s):  
Hossein Rouhani ◽  
Sara Mahallati ◽  
Richard Preuss ◽  
Kei Masani ◽  
Milos R. Popovic
Keyword(s):  
Relative Error ◽  
Sagittal Plane ◽  
Gaussian Function ◽  
Spinal Column ◽  
Transverse Plane ◽  
Lumbar Region ◽  
Experimental Errors ◽  
Rms Error ◽  
Lower Lumbar ◽  
Anterior Direction

The ranges of angular motion measured using multisegmented spinal column models are typically small, meaning that minor experimental errors can potentially affect the reliability of these measures. This study aimed to investigate the sensitivity of the 3D intersegmental angles, measured using a multisegmented spinal column model, to errors due to marker misplacement. Eleven healthy subjects performed trunk bending in five directions. Six cameras recorded the trajectory of 22 markers, representing seven spinal column segments. Misplacement error for each marker was modeled as a Gaussian function with a standard deviation of 6 mm, and constrained to a maximum value of 12 mm in each coordinate across the skin. The sensitivity of 3D intersegmental angles to these marker misplacement errors, added to the measured data, was evaluated. The errors in sagittal plane motions resulting from marker misplacement were small (RMS error less than 3.2 deg and relative error in the angular range less than 15%) during the five trunk bending direction. The errors in the frontal and transverse plane motions, induced by marker misplacement, however, were large (RMS error up to 10.2 deg and relative error in the range up to 58%), especially during trunk bending in anterior, anterior-left, and anterior-right directions, and were often comparable in size to the intersubject variability for those motions. The induced errors in the frontal and transverse plane motions tended to be the greatest at the intersegmental levels in the lower lumbar region. These observations questioned reliability of angle measures in the frontal and transverse planes particularly in the lower lumbar region during trunk bending in anterior direction, and thus did not recommend interpreting these measures for clinical evaluation and decision-making.

Two Models of Public Opinion: Bacon's ‘New Logic’ and Diotima's ‘Tale of Love’ (The Prothero Lecture)

1974 ◽  
Vol 24 ◽  
pp. 79-96
Author(s):  
Samuel H. Beer
Keyword(s):  
United States ◽  
Public Policy ◽  
Eighteenth Century ◽  
Public Opinion ◽  
Theoretical Approach ◽  
Democratic Theory ◽  
The United States ◽  
Representative Government ◽  
The Subject ◽  
Work Done

It is appropriate that an American should address himself to the subject of public opinion. For, in terms of quantity, Americans have made the subject peculiarly their own. They have also invested it with characteristically American concerns. Most of the work done on the subject in the United States is oriented by a certain theoretical approach. This approach is democratic and rationalist. Both aspects create problems. In this paper I wish to play down the democratic problem, viz., how many of the voters are capable of thinking sensibly about public policy, and emphasize rather the difficulties that arise from modern rationalism. Here I take a different tack from most historians of the concept of public opinion, who, taking note of the origin of the term in the mid-eighteenth century, stress its connection with the rise of representative government and democratic theory.

scholarly journals The Kodak research laboratories

1948 ◽  
Vol 135 (879) ◽  
pp. 133-147
Keyword(s):  
New York ◽  
Research Laboratory ◽  
New Materials ◽  
General Electric Company ◽  
Electric Company ◽  
Light Filters ◽  
University College London ◽  
The Subject ◽  
Work Done ◽  
Dark Room

In 1880 George Eastman commenced the manufacture and sale of gelatin photographic dry plates in Rochester, New York. From that undertaking, the Eastman Kodak Company, incorporated as an American company in 1902, has developed. In 1912 Mr Eastman decided to organize a laboratory, independent of the factory laboratories, which should carry out work on both the science and practice of photography. He was influenced by his observation of the success of industrial research under Dr Whitney’s direction at the research laboratory of the General Electric Company in Schenectady, New York, U. S. A. and of the laboratories of the great German dye works. He had been particularly impressed by the work done by the Bayer Company at Elberfeld. In 1906 I had completed my thesis for the doctorate of science at University College, London, the subject being the theory of the photographic process, and had joined the old-established but very small firm of Wratten and Wainwright, Ltd., of Croydon as joint managing director. At Croydon both the conduct of research on photography and its application to the manufacture of photographic materials were continued actively, so that by 1912 many new materials had been introduced, especially panchromatic plates and the light filters and dark-room safe-lights required for their use; and the little firm was flourishing.

scholarly journals Some Problems of Perspective Planning in Pakistan

1964 ◽  
Vol 4 (2) ◽  
pp. 193-202
Author(s):  
Said Hasan
Keyword(s):  
Policy Making ◽  
Time Horizon ◽  
Close Relation ◽  
The Third ◽  
Preceding Period ◽  
The Subject ◽  
Perspective Planning ◽  
Economic Future ◽  
Work Done

The growing confidence of Pakistan's planners in the nation's economic future is indicated by the boldness of their successive plans and by the lengthening of their time horizon. As far as the latter is concerned, the First Five-Year Plan did not reflect any thinking on economic and social development beyond a specific five-year period; the Second Plan, however, contained some remarks on long-term growth; the Third Plan is being prepared in close relation to the work being done on the Perspective Plan. What fifteen years ago would have been regarded as a waste of time is now considered to be of basic import¬ance for sound planning. What nobody dared think about in the earlier days is now the subject of serious analysis and policy-making. The need for a Perspective Plan is there not only from an economic angle but there are also sound political reasons for it. From the economic angle, we realized that the five-year periods chosen for our plans are only arbitrary periods in a process stretching over a much longer time. Our decisions and policies during one plan influence the pattern of growth in the next one, and influence also the effectiveness of established policies. Therefore, any particular five-year plan has to be part of a whole chain of plans, all fitting together and building further on the work done in the preceding period.

scholarly journals Objektivnost različitih načina procjenjivanja školskih pisanih zadaća

2018 ◽  
Vol 29 (6) ◽  
Author(s):  
Tomislav Grgin ◽  
Bogdana Marinković
Keyword(s):  
Middle School ◽  
Third Graders ◽  
School Work ◽  
The Third ◽  
School Subjects ◽  
The Subject ◽  
Work Done

The investigation was conducted In order to evaluate the objecitivily of the three ways of grading school work: classical way which is used most in schools, then grading with the help of "standard notebook" lor the grade "C" and the grading of work comparatively in pairs. The subject of evaluation was the school work of the third-graders in middle school. Subjects were history and biology, The independent graders were the teachers of these subjects from different middle schools.The results showed that all of these ways of grading do not ensure the same objectivity of grades. The least objective is the classical way, more reliable is one with "standard notebook" and relatively most reliable is the comparison of school work done in pairs.

scholarly journals Smart Advisor: An Intelligent Inventory Prediction Based On Regression Model

2018 ◽  
Vol 2 (3) ◽  
pp. 86-94
Author(s):  
Ömer Küçük ◽  
Farzad Kiani
Keyword(s):  
Regression Model ◽  
Inventory Management ◽  
Raw Material ◽  
Accurate Estimation ◽  
Stock Management ◽  
Accurate Analysis ◽  
Academic Literature ◽  
For Profit ◽  
The Subject ◽  
Work Done

Today one of the biggest expense items of the enterprises is raw material and stock amounts. Therefore, proper inventory management is very important for the profitability of the enterprises. Products that are not purchased on time cause interruptions in production and products left over because the expiration date has passed will also cause losses for businesses. Therefore, proper inventory management is critical for profit / loss situations of businesses. In this paper we presented a model to predict the demand of certain stock items by using a regression model. Our model can analysis and computer the prediction results on agiven dataset. We evaluate our model on sample dataset and provide the analysis as well calculations over the existing inventory. Accurate analysis of stock consumption enables accurate estimation of the amount of stock to be consumed in the future. Accurate forecasting of stock consumption helps to take corrective steps in decision making. That is, it only allows you to buy in sufficient quantity when necessary. These stages are critical for economic stock management. For this reason, robust and adaptable approaches that can provide models ensure that stock consumption can be managed properly. It is difficult to find previously written sources on estimating the direction of stock movements. One of the most important reasons for this is the lack of incentive to make such studies in the academic literature. As a result, articles written about the subject and the work done have been limited, the results have not reached the reproducible level.

scholarly journals Evaluación y desarrollo de la competencia digital de futuros maestros en la Universidad de Murcia

2016 ◽  
Vol 6 (1) ◽  
pp. 51-56 ◽  
Author(s):  
Isabel Gutiérrez Porlán ◽  
José Luis Serrano Sánchez
Keyword(s):  
First Year ◽  
Self Perception ◽  
Initial Task ◽  
Initial Questionnaire ◽  
The Subject ◽  
Digital Competencies ◽  
Faculty Of Education ◽  
The One ◽  
The University ◽  
Work Done

<p class="AbstractText">This paper presents the findings of a study carried out in the academic year 2014-2015 at the faculty of Education of the University of Murcia with first year degree students in Primary Education studying Research and ICT. The study started with the application of the DIGCOM questionnaire to analyze the digital competences of 134 students. The questionnaire served as an initial task to help students reflect on their digital competences. The subject was developed around tasks which adopted a transversal approach and used the nature of the contents itself to direct and improve students’ digital competencies. Finally, the initial questionnaire was reformulated and run in order to ascertain the students’ self-perception of their improvement in these competencies through the tasks they had performed.</p> <p class="AbstractText">Below we present the tasks carried out, the organization of each subject and the most relevant data regarding the self-perception of digital competencies of the future primary school teachers enrolled at the University of Murcia. The data reveal, on the one hand, that the students participating consider themselves to be competent in the most basic aspects of digital competencies and, on the other, their perception that the work done in the subject has helped them quite a lot in improving their competencies.</p>

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