Cadence, Age, and Weight as Determinants of Forefoot Plantar Pressures Using the Biofoot In-shoe System

2008 ◽  
Vol 98 (4) ◽  
pp. 302-310 ◽  
Author(s):  
Alfonso Martínez-Nova ◽  
Javier Pascual Huerta ◽  
Raquel Sánchez-Rodríguez
Keyword(s):  
Healthy Subjects ◽  
Intraclass Correlation ◽  
Correlation Coefficients ◽  
Metatarsal Head ◽  
Multiple Regression Model ◽  
Good Reliability ◽  
Intraclass Correlation Coefficients ◽  
Plantar Pressures ◽  
Foot Biomechanics ◽  
Peak Plantar Pressure

Background: We evaluated normal plantar pressures and studied the effect of weight, cadence, and age on forefoot plantar pressures in healthy subjects by using the Biofoot (Instituto de Biomecánica de Valencia, Valencia, Spain) in-shoe measurement system. Methods: The feet of 45 healthy subjects with no evident foot or lower-limb diseases were measured with the Biofoot in-shoe system. The forefoot was divided into seven areas: the first through fifth metatarsal heads, the hallux, and the second through fifth lesser toes. Three trials of 8 sec each were recorded twice in each subject, and the mean was used to analyze peak and mean plantar pressures. A multiple regression model including weight, age, and cadence was run for each metatarsal head, the hallux, and the lesser toes. Intraclass correlation coefficients and coefficients of variation were also calculated to assess reliability. Results: The second metatarsal head had the greatest peak (960 kPa) and mean (585.1 kPa) pressures, followed by the third metatarsal head. Weight and cadence combined explained 18% and 23% of peak plantar pressure at the second and third metatarsal heads, respectively (P < .001). The intraclass correlation coefficient varied from 0.76 to 0.96 for all variables. The coefficient of variation between sessions ranged from 5.8% to 9.0%. Conclusion: The highest peak and mean plantar pressures were found at the second and third metatarsal heads in healthy subjects. Weight, cadence, and age explained a low variability of this pressure pattern. The Biofoot in-shoe system has good reliability to measure plantar pressures. These data will have implications for the understanding of normal foot biomechanics and its determinants. (J Am Podiatr Med Assoc 98(4): 302–310, 2008)

scholarly journals Action Boundary Proximity Effects on Perceptual-Motor Judgments

2019 ◽  
Vol 90 (12) ◽  
pp. 1000-1008
Author(s):  
Caleb D. Johnson ◽  
Alice D. LaGoy ◽  
Gert-Jan Pepping ◽  
Shawn R. Eagle ◽  
Anne Z. Beethe ◽  
...  
Keyword(s):  
Intraclass Correlation ◽  
Reaction Times ◽  
Correlation Coefficients ◽  
Proximity Effects ◽  
Testing Time ◽  
Good Reliability ◽  
Intraclass Correlation Coefficients ◽  
Coefficients Of Variation ◽  
Time Required ◽  
Action Coupling

INTRODUCTION: Designed as a more ecological measure of reaction times, the Perception-Action Coupling Task (PACT) has shown good reliability and within-subject stability. However, a lengthy testing period was required. Perceptual-motor judgments are known to be affected by proximity of the stimulus to the action boundary. The current study sought to determine the effects of action boundary proximity on PACT performance, and whether redundant levels of stimuli, eliciting similar responses, can be eliminated to shorten the PACT.METHODS: There were 9 men and 7 women who completed 4 testing sessions, consisting of 3 familiarization cycles and 6 testing cycles of the PACT. For the PACT, subjects made judgments on whether a series of balls presented on a tablet afford “posting” (can fit) through a series of apertures. There were 8 ratios of ball to aperture size (B-AR) presented, ranging from 0.2 to 1.8, with each ratio appearing 12 times (12 trials) per cycle. Reaction times and judgment accuracy were calculated, and averaged across all B-ARs. Ratios and individual trials within each B-AR were systematically eliminated. Variables were re-averaged, and intraclass correlation coefficients (ICC) and coefficients of variation (CVTE) were calculated in an iterative manner.RESULTS: With elimination of the 0.2 and 1.8 B-ARs, the PACT showed good reliability (ICC = 0.81–0.99) and consistent within-subject stability (CVTE = 2.2–14.7%). Reliability (ICC = 0.81–0.97) and stability (CVTE = 2.6–15.6%) were unaffected with elimination of up to 8 trials from each B-AR.DISCUSSION: The shortened PACT resulted in an almost 50% reduction in total familiarization/testing time required, significantly increasing usability.Johnson CD, LaGoy AD, Pepping G-J, Eagle SR, Beethe AZ, Bower JL, Alfano CA, Simpson RJ, Connaboy C. Action boundary proximity effects on perceptual-motor judgments. Aerosp Med Hum Perform. 2019; 90(12):1000–1008.

Reliability of Dermatologists in Acne Lesion Counts and Global Assessments

2006 ◽  
Vol 10 (4) ◽  
pp. 160-165 ◽  
Author(s):  
Jerry K.L. Tan ◽  
Karen Fung ◽  
Lynne Bulger
Keyword(s):  
Intraclass Correlation ◽  
Training Session ◽  
Correlation Coefficients ◽  
Good Reliability ◽  
Inflammatory Lesions ◽  
Acne Lesion ◽  
Intraclass Correlation Coefficients ◽  
Outcome Measurements ◽  
Group A ◽  
Group B

Background: There is a paucity of data on the reliability of dermatologists in acne lesion counting and global severity assessments. The effects of training and practice on reliability are also uncertain. The objective of this study was to determine the reliability of these outcome measurements when performed by trained dermatologists. Methods: Eleven dermatologists were divided into two groups that evaluated the same six acne subjects twice on the same day. A training session was provided either after (group A) or before (group B) the first patient evaluation sessions. Reliability of raters in lesion counting and global severity assessment was determined by calculation of intraclass correlation coefficients (ICCs). ICC values close to 1.0 indicate excellent reliability, whereas values less than 0.75 are considered unacceptable. Results: Intrarater ICCs ranged from 0.37 to 0.99 for noninflammatory lesions, 0.26 to 0.97 for inflammatory lesions, and 0.56 to 0.83 for global assessments for group A (trained after); corresponding values for group B (trained before) were 0.84 to 0.98, 0.61 to 0.95, and 0.43 to 0.91. ICC values ≥ 0.75 for all three outcome parameters were observed in one of six group A and three of five group B raters. Interrater ICCs for groups A and B after the first evaluation session were 0.17 versus 0.68 for noninflammatory counts, 0.84 versus 0.72 for inflammatory counts, and 0.71 versus 0.65 for global assessments, respectively. Corresponding values after session 2 were 0.79 and 0.77 for noninflammatory, 0.81 and 0.90 for inflammatory, and 0.61 and 0.77 for global assessments. Conclusion: Dermatologists tended to be reliable in acne lesion counting but somewhat less so in global assessments. Training tended to improve group reliability in noninflammatory lesion counts and increased the proportion of raters with good reliability in all three outcome measures. Practice enhanced reliability in all outcome measurements.

scholarly journals Deaminase associated single nucleotide variants in blood and saliva-derived exomes from healthy subjects

2019 ◽  
Author(s):  
Nathan E. Hall ◽  
Jared Mamrot ◽  
Christopher M.A. Frampton ◽  
Prue Read ◽  
Edward J. Steele ◽  
...  
Keyword(s):  
Exome Sequencing ◽  
Whole Exome Sequencing ◽  
Healthy Subjects ◽  
Intraclass Correlation ◽  
Correlation Coefficients ◽  
Healthy Individuals ◽  
Intraclass Correlation Coefficients ◽  
Whole Exome ◽  
The Impact ◽  
Group 1

AbstractBackgroundDeaminases play an important role in shaping inherited and somatic variants. Disease related SNVs are associated with deaminase mutagenesis and genome instability. Here, we investigate the reproducibility and variance of whole exome SNV calls in blood and saliva of healthy subjects and analyze variants associated with AID, ADAR, APOBEC3G and APOBEC3B deaminase sequence motifs.MethodsSamples from twenty-four healthy Caucasian volunteers, allocated into two groups, underwent whole exome sequencing. Group 1 (n=12) analysis involved one blood and four saliva replicates. A single saliva sample was sequenced for Group 2 subjects (n=12). Overall, a total of 72 whole exome datasets were analyzed. Biological (Group 1 & 2) and technical (Group 1) variance of SNV calls and deaminase metrics were calculated and analyzed using intraclass correlation coefficients. Candidate somatic SNVs were identified and evaluated.ResultsWe report high blood-saliva concordance in germline SNVs from whole exome sequencing. Concordant SNVs, found in all subject replicates, accounted for 97% of SNVs located within the protein coding sequence of genes. Discordant SNVs have a 30% overlap with variants that fail gnomAD quality filters and are less likely to be found in dbSNP. SNV calls and deaminase-associated metrics were found to be reproducible and robust (intraclass correlation coefficients >0.95). No somatic SNVs were conclusively identified when comparing blood and saliva samples.ConclusionsSaliva and blood both provide high quality sources of DNA for whole exome sequencing, with no difference in ability to resolve SNVs and deaminase-associated metrics. We did not identify somatic SNVs when comparing blood and saliva of healthy individuals, and we conclude that more specialized investigative methods are required to comprehensively assess the impact of deaminase activity on genome stability in healthy individuals.

scholarly journals Ultrasonography Method of Deep Cervical Muscles and Thickness Measurement Reliability in Cervicogenic Headache and Healthy Subjects:APilot Study

2021 ◽  
Author(s):  
Omolbanin Abaspour ◽  
Mohammad Akbari ◽  
Asghar Rezasoltani
Keyword(s):  
Healthy Subjects ◽  
Intraclass Correlation ◽  
Correlation Coefficients ◽  
Muscle Thickness ◽  
Cervicogenic Headache ◽  
Thickness Measurement ◽  
Neck Muscle ◽  
Ultrasound Images ◽  
Intraclass Correlation Coefficients ◽  
Linear Probe

Introduction: In Cervicogenic Headache (CGH), motor control of muscles is impaired and deep upper neck muscles (extensor and flexor muscles) become atrophied. In this research, thickness measurement of Longus Capitis (LCap), Rectus Capitis Posterior Major (RCPM), and Obliquus Capitis Superior (OCS) muscles were conducted and intra-rater reliability of the thickness measurement of these muscles was assessed in CGH and healthy subjects. Materials and Methods: Twenty subjects, including 10 healthy subjects (19-32 years old) and 10 CGH patients (20-35 years old) participated in this study. LCap thickness was measured at the level of C3-C4 in the supine position and posterior muscles (RCPM and OCS) thickness at the C1-C2 level in the sitting position. All ultrasound images were captured by a linear probe with a 50-mm footprint in B mode option and frequency range of 9-12 Hz. Intraclass Correlation Coefficients (ICC), Standard Error Of Measurement (SEM), and the Smallest Detectable Difference (SDD) were calculated for data analysis. Results: The ICC for thickness measurement of LCap was from 0.70 to 0.91 (good to excellent), for RCPM thickness was from 0.69 to 0.94 and for OCS muscle thickness was from 0.87 to 0.98. SEM values for LCap were between 0.08 and 0.25 and the SDD values between 0.22 and 0.71. SEM values for RCPM were between 0.22 and 0.43 and these values were reported for OCS muscle between 0.19 and 0.45. Conclusion: The results indicated that the presented position and the level of ultrasonography in this study are appropriate and ultrasound is a reliable tool to measure the deep upper neck muscle thickness in CGH and healthy subjects.

scholarly journals Test–Retest Reliability of a New Device Versus a Long-Arm Goniometer to Evaluate Knee Proprioception

2021 ◽  
pp. 1-6
Author(s):  
Fei Tian ◽  
Yaqi Zhao ◽  
Jixin Li ◽  
Wenjin Wang ◽  
Danni Wu ◽  
...  
Keyword(s):  
Standard Error ◽  
Intraclass Correlation ◽  
Correlation Coefficients ◽  
Joint Position Sense ◽  
Repeated Measurements ◽  
Good Reliability ◽  
Retest Reliability ◽  
New Device ◽  
Intraclass Correlation Coefficients ◽  
Test Retest Reliability

Context: Many methods used to evaluate knee proprioception have shortcomings that limit their use in clinical settings. Based on an inexpensive 3D camera, a new portable device was recently used to evaluate the joint position sense (JPS) of the knee joint. However, the test–retest reliability of the new method remains unclear. This study aimed to evaluate the test–retest reliability of the new device and a long-arm goniometer for assessing knee JPS, and to compare the variability of the 2 methods. Design: Prospective observational study of the test–retest reliability of knee JPS measurements. Methods: Twenty-one healthy adults were tested in 2 sessions with a 1-week interval. Three target knee flexion angles (30°, 45°, and 60°) were reproduced in each session. Target and reproduced angles were measured with both methods. Intraclass correlation coefficients, standard error of the measurement, and Bland–Altman plots were used to quantify test–retest reliability. Paired t tests were used to compare knee JPS (absolute error of the target-reproduced angle) between the methods. Results: The new device (good to excellent intraclass correlation coefficients .74–.80; standard error of the measurement 0.52°–0.61°) demonstrated better test–retest reliability than the goniometer (poor to fair intraclass correlation coefficients .23–.43; standard error of the measurement 0.89°–2.07°) and better test–retest agreement (respective mean differences for the 30°, 45°, and 60° knee angles: 0.11°, 0.13°, and 0.41° for the new system; 0.84°, 1.52°, and 1.18° for the goniometer). The measurements (absolute errors of the target-reproduced angles) with the goniometer were significantly greater than those with the new device (P < .05); the SDs of repeated measurements with the goniometer (1.50°–2.41°) were greater than with the new device (1.08°–1.38°). Conclusions: Given that the new device has good reliability and sufficient precision, it is the better alternative for evaluating knee JPS. Goniometers should be used with caution to assess knee JPS.

Assessment of Physical Activity in Adults: A Review of Validated Questionnaires From a Nutritionist’s Point of View

2020 ◽  
Vol 43 (4) ◽  
pp. 235-254
Author(s):  
Angela Patricia Bacelis-Rivero ◽  
Anabel Vázquez-Rodríguez ◽  
Claudia E. Carrasco-Legleu ◽  
Lidia G. De León ◽  
Sandra Alicia Reza-López
Keyword(s):  
Physical Activity ◽  
Energy Expenditure ◽  
Intraclass Correlation ◽  
Reliability And Validity ◽  
Correlation Coefficients ◽  
Epidemiological Studies ◽  
Point Of View ◽  
Eligibility Criteria ◽  
Good Reliability ◽  
Intraclass Correlation Coefficients

Physical activity (PA) is a component of total energy expenditure. PA and PA energy expenditure (PAEE) can be estimated by objective techniques (OTs). However, the use of questionnaires is frequent in clinical settings and epidemiological studies. We conducted a search on PubMed, Scopus, and Google Scholar databases to perform a review of studies reporting the reliability and validity of PA questionnaires validated against OTs—doubly labeled water (DLW) or accelerometers—in free-living adults. We selected original articles published between 2009 and 2019 that reported validation studies of PA questionnaires. We identified 53 studies that fulfilled the eligibility criteria. Four PA questionnaires were validated against DLW and the remaining against accelerometers. Three questionnaires were compared with both DLW and accelerometer results. The correlation between questionnaire-estimated PAEE and DLW results ranged from r = .22 to r = .46, while that between questionnaire-estimated total PA (TPA) and accelerometer results ranged from r = .11 to r = .54 The intraclass correlation coefficients were between .56 and .84. Despite having good reliability, most of the questionnaires included in this review have shown limited validity for estimating TPA in adults. OTs should be considered as a first option, when possible. Further research is warranted on techniques to obtain more accurate PA and PAEE estimates.

The Reliability of the Manual Supination Resistance Test

2003 ◽  
Vol 93 (3) ◽  
pp. 185-189 ◽  
Author(s):  
Hazel Noakes ◽  
Craig Payne
Keyword(s):  
Clinical Outcomes ◽  
Correlation Coefficient ◽  
Intraclass Correlation Coefficient ◽  
Intraclass Correlation ◽  
Correlation Coefficients ◽  
Resistance Test ◽  
Foot Orthoses ◽  
Good Reliability ◽  
Intraclass Correlation Coefficients ◽  
Foot Pronation

Several decisions need to be made when prescribing foot orthoses for abnormal foot pronation. One of these decisions is how much force is needed from orthoses to supinate the foot. The supination resistance test has been described as one technique to help determine the amount of force needed. The aim of this project was to determine the reliability of the manual supination resistance test. Four clinicians of differing levels of experience performed the test on 44 subjects (88 feet) on 2 separate days. The test had good reliability overall, with an intertester intraclass correlation coefficient of 0.89. For the two more experienced clinicians, the intratester intraclass correlation coefficients were good (0.82 and 0.78), but for the two inexperienced clinicians they were poor (0.56 and 0.62). The supination resistance test may be clinically useful in the prescription of foot orthoses, but more work is needed to determine its validity and its relationship to clinical outcomes. (J Am Podiatr Med Assoc 93(3): 185-189, 2003)

Reliability and Repeatability of the Portable EPS-Platform Digital Pressure-Plate System

2013 ◽  
Vol 103 (3) ◽  
pp. 197-203 ◽  
Author(s):  
Ricardo Becerro de Bengoa Vallejo ◽  
Marta Elena Losa Iglesias ◽  
Joseph Zeni ◽  
Stephen Thomas
Keyword(s):  
A Priori ◽  
Intraclass Correlation ◽  
Correlation Coefficients ◽  
Future Studies ◽  
Intraclass Correlation Coefficients ◽  
Plantar Pressures ◽  
Several Variables ◽  
Digital Pressure ◽  
Coefficients Of Variation ◽  
Dynamic Gait

Background: Abnormal plantar pressures are the hallmark characteristic of several conditions and pathologic abnormalities. Pressure platforms allow for quick and accurate screening of patients and help guide clinical treatment. However, it is essential to evaluate the reliability and repeatability of these devices before making clinical decisions. The purpose of this study was to determine the reliability of the EPS-Platform during static and dynamic activities. Methods: Fifty-six healthy individuals stood and walked onto the pressure platform. Five trials were performed during two separate testing sessions to determine intrasession and intersession reliability. Pressure data were obtained and several variables of interest were calculated for intrasession and intersession reliability using intraclass correlation coefficients (ICCs), SEM, percent error, and coefficient of variation. Results: Static and dynamic intrasession and intersession reliability produced moderate-to-excellent ICCs, low SEMs, low percent errors, and low coefficients of variation. Static trials had higher ICCs, lower percent errors, and lower coefficients of variation compared with dynamic trials. Intersession reliability also had higher ICCs, lower percent errors, and lower coefficients of variation compared with intrasession reliability. Conclusions: This study demonstrates that the EPS-Platform is a reliable device for collecting gait plantar pressures. Static trials produce better reliability, most likely owing to the large inherent variability during dynamic gait. Intersession reliability was higher than intrasession reliability owing to the intersession measures being calculated with an average of five trials. By averaging the trials, the variability of gait is decreased, and this improves the accuracy of the results. These results can be used as the basis for future studies and to determine a priori sample sizes for investigations that use the EPS-Platform. (J Am Podiatr Med Assoc 103(3): 197–203, 2013)

Test–Retest Reliability of Soccer Dribbling Tests in Children

2021 ◽  
pp. 1-7
Author(s):  
Michael J. Duncan ◽  
Darren Richardson ◽  
Rhys Morris ◽  
Emma Eyre ◽  
Neil D. Clarke
Keyword(s):  
Coefficient Of Variation ◽  
Pediatric Population ◽  
Intraclass Correlation ◽  
Correlation Coefficients ◽  
Systematic Bias ◽  
Limits Of Agreement ◽  
Good Reliability ◽  
Retest Reliability ◽  
Intraclass Correlation Coefficients ◽  
Test Retest Reliability

The present study examined the test–retest reliability of the Ghent University dribbling test and short dribble test in a pediatric population. Fifty-four boys aged 9–14 years (mean ± SD = 11 ± 2 years) undertook the Ghent University and dribbling tests on two occasions separated by 2 weeks. Intraclass correlation coefficients, coefficient of variation, and 95% limits of agreement were conducted for each test. Intraclass correlation coefficients and coefficient of variation indicated good to excellent reliability, and relatively small variability for both dribbling tests. The 95% limits of agreement indicated relatively little bias Ghent University dribbling test for both running alone and running with the ball components, and the Bangsbo and Mohr short dribble test. The results of the present study suggest both dribbling tests examined in the present study demonstrate good reliability and low levels of systematic bias.

Pellucid marginal degeneration versus keratoconus: distinction with wide-field SD-OCT corneal sublayer pachymetry

2020 ◽  
pp. bjophthalmol-2020-316496
Author(s):  
Niklas Mohr ◽  
Mehdi Shajari ◽  
Daniel Krause ◽  
Stefan Kassumeh ◽  
Jakob Siedlecki ◽  
...  
Keyword(s):  
Intraclass Correlation ◽  
Area Under The Curve ◽  
Correlation Coefficients ◽  
Cross Sectional Study ◽  
Wide Field ◽  
Good Reliability ◽  
Cross Sectional ◽  
Intraclass Correlation Coefficients ◽  
Calculated Ratio ◽  
Sd Oct

PurposeTo evaluate the capability of wide-field spectral-domain optical coherence tomography (SD-OCT) corneal sublayer pachymetry to distinguish between keratoconus and pellucid marginal degeneration (PMD).MethodsThis prospective cross-sectional study included 69 eyes (59 with keratoconus and 10 with PMD) of 69 patients. All patients were examined three subsequent times with the RTVue XR system. Pachymetry maps of the total cornea (CT), the epithelium (ET) and the stroma were generated using the onboard software. For analysis of reliability, the coefficients of variation and intraclass correlation coefficients (ICC) were calculated. Receiver operating characteristic analyses were performed to elaborate the most accurate pachymetric parameters for distinguishing between PMD and keratoconus.ResultsOverall repeatability of (sublayer) pachymetry was comparably good in both keratoconus (ICC ranging between 0.827 and 0.986) and PMD (ICC ranging between 0.753 and 0.998). Measurement reliability in keratoconic eyes was a negative function of Kmax (p<0.05). As compared with keratoconus, PMD exhibited higher CT (526±31 µm vs 503±30 µm; p=0.02) and ET (56±7 µm vs 51±5 µm; p=0.02) in the inferotemporal 2–5 mm sector as well as lower ET in the inferior 7–9 mm sector (52±5 µm vs 57±5 µm; p<0.01). The calculated ratio between CT in the inferotemporal 2–5 mm and in the inferior 7–9 mm sector yielded the highest diagnostic accuracy for distinguishing between PMD and keratoconus with an area under the curve of 0.977 and an optimal cut-off value of 0.90.ConclusionWide-field SD-OCT corneal sublayer pachymetry showed good reliability in PMD and keratoconus and may be useful to differentiate between the two ectatic diseases.

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