Frequency content of normal and diabetic plantar pressure profiles: Implications for the selection of transducer sizes

During the past two decades, improvements in technology and changes in conceptualization have contributed to greater objectivity in the assessment of micturition reflex disturbances.1,2 These changes have been applied principally to analysis of adult dysfunction and have recently been implemented in evaluation of neuromuscular dysfunction of the urinary bladder in infancy and childhood. These newer methods include gas cystometry,3 integrated sphincter electromyography (EMG),4 measurement of reflex-evoked potentials in micturition reflex pathways,5 and electroencephalography (EEG).6 Complementary urodynamic methods include uroflowmetry,7 measurement of urethral pressure profiles,8,9 and observation of pressure-flow relationships during voiding.10 These studies, when appropriately selected and individualized to the patient as a result of the history and examination, provide valuable information. They delineate the site and nature of the impairment of the nervous mechanisms used in the neural and muscular infrastructure in micturition during infancy and childhood. Finally, they provide a rational basis for selection of pharmacologic agents11 and surgical techniques12 to restore urinary continence. Gas cystometry technique Gas cystometry has replaced water cystometry in the evaluation of patients for detrusor reflex instability. The patients are catheterized, and the bladder is inflated with carbon dioxide at room temperature at a constant flow rate of up to a maximum of 200 ml/min. Intravesical pressure is recorded by an isovolumetric strain gauge and transducer amplifier calibrated in centimeters of water.4 Because of the high perfusion rate and brief test interval, additional testing for reflex instability is facilitated. These additional procedures include (1) change in posture from supine to upright, (2) determination of response to subcutaneous injection of bethanechol, and (3) sleep cystometry.

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Cyclic Loading Histories for Seismic Experimentation on Structural Components

Earthquake Spectra ◽

10.1193/1.1585865 ◽

1996 ◽

Vol 12 (1) ◽

pp. 1-12 ◽

Cited By ~ 40

Author(s):

Helmut Krawinkler

Keyword(s):

Inelastic Deformation ◽

Cyclic Load ◽

Deformation Characteristics ◽

Frequency Content ◽

Structural Components ◽

Seismic Demands ◽

Critical Issues ◽

Load Tests ◽

Two Parameters ◽

Selection Of

In order to utilize results obtained from quasi-static cyclic load tests on structural components for a general performance evaluation, the need exists to establish loading histories that capture critical issues of component capacity as well as seismic demands. In inelastic seismic problems capacity and demands cannot be separated since one may strongly depend on the other. Because of cumulative damage issues the capacity depends on the number of inelastic excursions and the magnitude of each excursion (not just the largest one). These two parameters depend on the frequency content of the ground motion, the period(s) of the structure, and the strength and inelastic deformation characteristics of the structure. The paper presents procedures how these characteristics can be considered in the selection of suitable loading histories.

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Plantar Pressure Profiles and Possible Foot Syndromes of the Taiwanese College Elite Basketball Players

Journal of the American Podiatric Medical Association ◽

10.7547/18-043 ◽

2020 ◽

Author(s):

Tong-Hsien Chow ◽

Yih-Shyuan Chen ◽

Wen-Cheng Tsai ◽

Ming-Hsien Lin

Keyword(s):

Musculoskeletal Pain ◽

Plantar Pressure ◽

Injury Incidence ◽

Basketball Players ◽

Jones Fracture ◽

Longitudinal Arch ◽

Metatarsal Bones ◽

Pressure Profiles ◽

Recreational Basketball ◽

The Common

Background: Plantar pressure assessment are useful for understanding the functions of the foot and lower limb and predicting injury incidence rates. Musculoskeletal fatigues are likely to affect the results of plantar pressure profiles. This study aimed at characterizing college elite basketball players' plantar pressure profiles and pain profiles during static standing and walking. Methods: Fifty-one male elite basketball players and eighty-five male recreational basketball players participated in this study. An optical plantar pressure measurement system was used for collecting the arch index (AI), regional plantar pressure distributions (PPDs), and footprint characteristics during static and dynamic activities. Elite basketball players' pain profiles were examined for evaluating their common musculoskeletal pain areas.Results: The AI values in recreational basketball players fell in the normal range, whereas was considerably lower in elite basketball players. Elite basketball players' static PPDs of both feet were mainly exerted on the lateral longitudinal arch and the lateral heel, and relatively lower on the medial longitudinal arch, the medial and lateral metatarsal bones. The PPDs mainly transferred to the lateral metatarsal bone and lateral longitudinal arch, and decreased at the medial heel during the midstance phase of walking. The footprint characteristics of elite basketball players illustrated the features of the calcaneal varus (supinated foot) of high arches and the dropped cuboid foot. The lateral ankle joints and anterior cruciate ligaments were the common musculoskeletal pain areas. Conclusions: Elite basketball players' AI values was found to be high arches, and their PPDs tended to parallel the features of the high-arched supinated and dropped cuboid foot. Their pain profiles not only resonated with the common basketball injuries, but also reflected the features of the Jones fracture and cuboid syndrome. The potential links among high-arched supinated foot, Jones fracture and cuboid syndrome are worth further studies.

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Intraoral Swallow Pressure Profiles-General Features and Aids to Categorization

10.21203/rs.3.rs-813839/v1 ◽

2021 ◽

Author(s):

Vincent Casey ◽

Alison Perry ◽

Richard Conway

Keyword(s):

Healthy Adults ◽

Envelope Function ◽

Data Set ◽

Pressure Sensing ◽

Time Profiles ◽

Sensing System ◽

Pressure Profiles ◽

Pressure Time ◽

Intraoral Pressure ◽

Selection Of

Abstract Purpose: The primary goal of this study was to establish a normative data set representing intraoral time series swallow pressure profiles for healthy adults using a novel wearable intraoral pressure sensing system, OroPress, developed to help with dysphagia (swallow disorder) clinical screening. Methods: Swallow intraoral pressure-time profiles for 35 healthy adults (17 male, 18 female) swallowing water (3 × 5cm3 ; 3 × 10cm3 ) and custard (3 × 5cm3 ) boluses (N = 9 × 35 = 315) were recorded using OroPress. Results: General swallow profile traits are identified to characterise an effective, efficient swallow. A profile-specific swallow envelope function is devised which in combination with profile metrics, provides a simple means of categorizing swallows as effective or impaired. Conclusion: The swallow profile data trace with superimposed and colour coded peaks, envelope function and related swallow metrics provides a simple human readable graphic to aid the real-time instrumented identification of subjects warranting more in-depth clinical assessment. It may also prove useful in the selection of training set profiles for machine learning and other analysis tools which could improve the discriminatory capabilities of intraoral pressure measurement in dysphagia diagnostics.

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Extended Observations and New Insights of Dynamically Triggered Tremor in Parkfield

10.5194/egusphere-egu21-12141 ◽

2021 ◽

Author(s):

Allie Hutchison ◽

Piero Poli

Keyword(s):

San Andreas Fault ◽

Peak Ground Velocity ◽

Dynamic Strain ◽

Frequency Content ◽

Physical Processes ◽

Dynamic Triggering ◽

Physical Conditions ◽

San Andreas ◽

Triggered Tremor ◽

Selection Of

<p>We create an extended catalog of dynamically triggered tremor in the Parkfield region of the San Andreas Fault for teleseismic and regional earthquakes from 2001-2020 with a magnitude threshold of M >7. After selection of clear dynamic triggering episodes, each tremor event is precisely located using a multi station approach. Using this new catalog of triggered tremor, we quantitatively evaluate the conditions under which tremor is triggered. In particular, we study the effect of frequency dependent peak dynamic strain, peak ground velocity, and the incident azimuth of triggering waves. We further try to assess if the triggering potential in the San Andreas Fault evolves as function of time. Finally, we search for differences and similarities (e.g. frequency content, location) between triggered and regular tremor. Our observations provide new insights about the physical conditions necessary for triggering tremor, and in general, on the physical processes generating non-volcanic tremors.</p>

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Plantar pressure profiles of athletes with and without ankle sprains while walking barefoot and in sport shoes

Footwear Science ◽

10.1080/19424280.2016.1145743 ◽

2016 ◽

Vol 8 (1) ◽

pp. 41-48 ◽

Cited By ~ 2

Author(s):

Jennifer Milford ◽

Christopher Charles Sole ◽

Gisela Sole

Keyword(s):

Plantar Pressure ◽

Ankle Sprains ◽

Pressure Profiles

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The frequency content of plantar pressure measurements during barefoot running

Footwear Science ◽

10.1080/19424280.2013.799606 ◽

2013 ◽

Vol 5 (sup1) ◽

pp. S138-S139 ◽

Cited By ~ 1

Author(s):

Joeri Gerlo ◽

Veerle Segers ◽

Dirk DeClercq

Keyword(s):

Plantar Pressure ◽

Pressure Measurements ◽

Frequency Content ◽

Barefoot Running

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Superplastic Deformation of Magnesium Alloy AZ31 under Biaxial Loading Condition

Materials Science Forum ◽

10.4028/www.scientific.net/msf.551-552.219 ◽

2007 ◽

Vol 551-552 ◽

pp. 219-224 ◽

Cited By ~ 6

Author(s):

Fadi K. Abu-Farha ◽

N.A. Rawashdeh ◽

Marwan K. Khraisheh

Keyword(s):

Magnesium Alloy ◽

Superplastic Deformation ◽

Loading Condition ◽

Biaxial Loading ◽

Superplastic Forming ◽

Pressure Profile ◽

Analytical Models ◽

Simulation And Optimization ◽

Pressure Profiles ◽

Selection Of

Accurate constitutive modeling of superplastic deformation is critical for successful simulation and optimization of superplastic forming. The selection of the forming pressure profiles in gas blow forming of superplastic materials is still based on trial and error due to the limited predictive capabilities of current models describing superplastic deformation. In general, these models are based on uniaxial loading condition, assuming isotropic behavior. In this work, we examine the biaxial bulge forming of AZ31 magnesium alloy using pressure profiles derived from different available analytical models. The results clearly show the need for more accurate description of superplastic deformation to improve predictive capabilities. In addition, a pressure profile that is generated using FE in conjunction with a microstructure-based constitutive model is used and the results indicate better ability to predict the height of the bulged sheet.

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Generation of Periodic Trajectories for Optimal Robot Excitation

Journal of Manufacturing Science and Engineering ◽

10.1115/1.2831194 ◽

1997 ◽

Vol 119 (4A) ◽

pp. 611-615 ◽

Cited By ~ 12

Author(s):

J. Swevers ◽

C. Ganseman ◽

J. De Schutter ◽

H. Van Brussel

Keyword(s):

Fourier Series ◽

Time Domain ◽

Optimization Problem ◽

Identification Accuracy ◽

Condition Numbers ◽

Frequency Content ◽

Motion Constraints ◽

Cartesian Space ◽

Time Domain Data ◽

Selection Of

This paper describes the parameterization of robot excitation trajectories for optimal robot identification based on finite Fourier series. The coefficients of the Fourier series are optimized for minimal sensitivity of the identification to measurement disturbances, which is measured as the condition number of a regression matrix, taking into account motion constraints in joint and cartesian space. This approach allows obtaining small condition numbers with few coefficients for each joint, which simplifies the optimization problem significantly. The periodicity of the resulting trajectories and the fact that one has total control over their frequency content, are additional features of the presented parameterization approach. They allow further optimization of the excitation experiments through time domain data averaging and optimal selection of the excitation bandwidth, which both help the reduction of the disturbance level on the measurements, and therefore improve the identification accuracy.

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