scholarly journals Validity of an inertial device for measuring linear and angular velocity in a leg extension exercise

2019 ◽  
Vol 234 (1) ◽  
pp. 30-36 ◽  
Author(s):  
José Pino-Ortega ◽  
Alejandro Bastida-Castillo ◽  
Alejandro Hernández-Belmonte ◽  
Carlos D Gómez-Carmona
Keyword(s):  
Angular Velocity ◽  
Concurrent Validity ◽  
Convergent Validity ◽  
Linear Displacement ◽  
Linear Velocity ◽  
Football Players ◽  
Movement Velocity ◽  
Leg Extension ◽  
Elite Level ◽  
Training Exercises

Traditionally, linear transducers have been used to evaluate resistance exercise with linear displacement. The current problem is the assessment of exercises with curvilinear displacement. For this reason, new devices should be assessed during training sessions. The purpose was to evaluate (1) the concurrent validity of mean linear velocity and (2) the convergent validity of mean angular velocity measured by an inertial device during a leg extension exercise. Ten elite-level football players completed six series of five repetitions of a leg extension exercise. WIMU PRO™ inertial device and GymAware® linear transducers as criterion measure were used to register data. To assess concurrent validity, the bias of the inertial device measures of velocity was analyzed with Bland–Altman plots with limits of agreement set at 95%. Convergent validity of inertial device measures of velocity was assessed with Pearson’s correlation analysis. Concurrent analysis showed a nearly perfect validity between linear transducers and inertial device in linear ( Bias = –0.011 ± 0.006) and angular velocity (–0.34 ± 2.08). A nearly perfect Pearson’s product–moment correlation coefficient between an inertial device and linear transducers in linear velocity ( r = 0.999) and between an inertial device and linear transducers (calculated) in angular velocity ( r = 0.999) was found. In conclusion, WIMU PRO is valid for measuring linear and angular velocity during two-dimensional linear and rotational motions of exercise equipment. This device can be used as a useful tool to assess movement velocity in resistance training exercises, even in curvilinear movements when linear transducers have obvious limitations.

scholarly journals Accuracy and Reliability of Inertial Devices for Load Assessment During Flywheel Workout

2021 ◽  
Vol 19 (1) ◽  
pp. 1-11
Author(s):  
Jose Pino-Ortega ◽  
Alejandro Hernández-Belmonte ◽  
Alejandro Bastida-Castillo ◽  
Carlos Gómez-Carmona ◽  
Daniel Rojas-Valverde
Keyword(s):  
Angular Velocity ◽  
Strength Training ◽  
Coefficient Of Variation ◽  
External Load ◽  
Pearson Correlation ◽  
Intraclass Correlation ◽  
Football Players ◽  
Inertial Measurement ◽  
Device Reliability ◽  
Elite Level

There is currently an increase in inertial flywheel application in strength training; thus, it must be monitored by an accurate and reliable device. The present study tested: (1) the accuracy of an inertial measurement device (IMU) to correctly measure angular velocity and (2) its inter-unit reliability for the measurement of external load. The analysis was performed using Pearson Correlation and Intraclass Correlation Coefficient (ICC). The IMU accuracy was tested using Bland-Altman and the reliability with the coefficient of variation (CV). Ten elite-level football players performed ten series of 5 repetitions in a one-hand standing row exercise (5 series with each arm). A nearly perfect accuracy (ICC=.999) and a very good between-device reliability (Bias=-.010; CV=.017%) was found. IMU is a reliable and valid device to assess angular velocity in inertial flywheel workout objectively.

Detection of Malingered Neurocognitive Dysfunction Among Patients with Acquired Brain Injuries

2013 ◽  
Vol 29 (4) ◽  
pp. 253-262 ◽  
Author(s):  
Omer Hegedish ◽  
Dan Hoofien
Keyword(s):  
Response Bias ◽  
Concurrent Validity ◽  
Convergent Validity ◽  
Brain Injuries ◽  
Neurocognitive Dysfunction ◽  
Word Memory Test ◽  
Malingered Neurocognitive Dysfunction ◽  
Compensation Seeking ◽  
Seeking Behavior ◽  
Verbal Test

The Word Memory Test (WMT) is one of the most sensitive forced-choice tests available designed to evaluate negative response bias (NRB). Presently there is no valid verbal test designed to evaluate NRB for Hebrew-speaking patients. The aims of the present study were to validate the response bias measures of the WMT among Hebrew-speaking patients with acquired brain injuries and to reveal the malingering base rate among Israeli patients involved in compensation-seeking. Participants were 112 patients. The Test of Memory Malingering (TOMM) was used for convergent validity and injury related variables were used for concurrent validity. A translated version of the WMT had high split-half reliability. Regarding convergent validity, WMT effort measures had high positive correlations with the TOMM. Moreover, based on TOMM cutoff scores for classification, the WMT had reasonable classification rates. Regarding concurrent validity, multivariate logistic regression revealed that failure in the WMT was significantly predicted by normal brainscans and involvement in compensation-seeking behavior. The baserate of probable malingering was 34%. These findings emphasize the universality of the WMT in detecting NRB and establishing a malingered neurocognitive dysfunction baserate among Israeli patients involved in compensation-seeking.

scholarly journals Adaptation and Psychometric Evaluation of the Chinese Counseling Competencies Scale-Revised

2021 ◽  
Vol 12 ◽  
Author(s):  
Wei Xia ◽  
William Ho Cheung Li ◽  
Tingna Liang ◽  
Yuanhui Luo ◽  
Laurie Long Kwan Ho ◽  
...  
Keyword(s):  
Concurrent Validity ◽  
Convergent Validity ◽  
Intraclass Correlation ◽  
Correlation Coefficients ◽  
Psychometric Evaluation ◽  
Counseling Competencies ◽  
Counselors In Training ◽  
Rater Reliability ◽  
Retest Reliability ◽  
Test Retest Reliability

Objectives: This study conducted a linguistic and psychometric evaluation of the Chinese Counseling Competencies Scale-Revised (CCS-R).Methods: The Chinese CCS-R was created from the original English version using a standard forward-backward translation process. The psychometric properties of the Chinese CCS-R were examined in a cohort of 208 counselors-in-training by two independent raters. Fifty-three counselors-in-training were asked to undergo another counseling performance evaluation for the test-retest. The confirmatory factor analysis (CFA) was conducted for the Chinese CCS-R, followed by internal consistency, test-retest reliability, inter-rater reliability, convergent validity, and concurrent validity.Results: The results of the CFA supported the factorial validity of the Chinese CCS-R, with adequate construct replicability. The scale had a McDonald's omega of 0.876, and intraclass correlation coefficients of 0.63 and 0.90 for test-retest reliability and inter-rater reliability, respectively. Significantly positive correlations were observed between the Chinese CCS-R score and scores of performance checklist (Pearson's γ = 0.781), indicating a large convergent validity, and knowledge on drug abuse (Pearson's γ = 0.833), indicating a moderate concurrent validity.Conclusion: The results support that the Chinese CCS-R is a valid and reliable measure of the counseling competencies.Practice implication: The CCS-R provides trainers with a reliable tool to evaluate counseling students' competencies and to facilitate discussions with trainees about their areas for growth.

scholarly journals Kinematics of a screw linkage

2021 ◽  
Vol 3 (12) ◽  
Author(s):  
Jing-Shan Zhao ◽  
Song-Tao Wei ◽  
Junjie Ji
Keyword(s):  
Angular Velocity ◽  
Linear Velocity ◽  
Kinematics Analysis ◽  
First Order ◽  
Definition Of

AbstractThis paper proposes a kinematics methodology in twist coordinates for screw linkages. Based on the definition of a twist, both the angular velocity of a link and the linear velocity of a point on it may be explicitly represented in twist coordinates. Through integration on the twist solution numerically or analytically, we may obtain the displacements. By differential or numerical differential interpolation of the twist, we can find the accelerations of the link. The most outstanding advantage of this kinematic algorithm is that only the numerical differential interpolation of the first order is required to calculate the acceleration while only the first order integration of the twist is enough to compute the displacement. This merit makes it particularly fit for developing programmes to accomplish the kinematics analysis of a spatial linkage.

scholarly journals Construction of a Rotation Acquisition System using Arduino and Scada Supervisory Software

2021 ◽  
Vol 9 (11) ◽  
pp. 173-182
Author(s):  
Adeilson Nascimento de Sousa ◽  
Laudileni Olenka ◽  
Jorge Luis Nepomuceno de Lima ◽  
Viviane Barrozo da Silva ◽  
Antonio Carlos Duarte Ricciotti ◽  
...  
Keyword(s):  
Angular Velocity ◽  
Data Acquisition ◽  
Open Source ◽  
Real Time ◽  
Graphical Representation ◽  
Data Acquisition System ◽  
Linear Velocity ◽  
Acquisition System ◽  
Instantaneous Values

This work presents the development and implementation of a System for Acquisition of Rotations composed of an open-source Arduino electronic prototyping platform and a Supervision and Data Acquisition System (SCADA). This system obtains instantaneous values for frequency, linear velocity, and angular velocity, and the graphical representation of said instantaneous values is in real-time. Thus, the proposed system is a mediator of learning for the teaching of Circular Movement Uniform, with theoretical/practical interaction essential in classes for understanding the content.

Development and Validation of an eHealth Literacy Scale: Measuring a Broad Spectrum of eHealth Skills in Web 3.0 Context (Preprint)

2021 ◽  
Author(s):  
Huaxuan Liu ◽  
Bik-Chu Chow ◽  
Wei Liang ◽  
Holger Hassel ◽  
Ya-Jun Wendy Huang
Keyword(s):  
College Students ◽  
Concurrent Validity ◽  
Convergent Validity ◽  
Three Dimensional ◽  
Internal Consistency Reliability ◽  
Item Pool ◽  
Chinese College Students ◽  
Ehealth Literacy ◽  
Web 3.0 ◽  
Test Retest Reliability

BACKGROUND eHealth literacy (EHL) refers to a mixture of capabilities that enable individuals to deal with health information via e-approach, and apply it to solve health problems. With the digitization of health care and the wide availability of health applications, a more diverse range of eHealth skills is required to properly use such health facilities. Existing EHL measurements focus mainly on the health skill of information obtaining (Web 1.0), yet skills of online interactivities (Web 2.0) and self-data managing and applying (Web 3.0) have not been well measured. OBJECTIVE This study aimed to (1) develop a measurement of EHL comprising a comprehensive spectrum of Web 1.0, 2.0, and 3.0 skills (eHLS-Web3.0) and (2) evaluate its validity and reliability along with the measurement invariance among college students. METHODS In Study 1, 421 Chinese college students (mean age = 20.5 ± 1.4 years; 51.8% female) and 8 health experts (mean age =38.3 ± 5.9 years; 87.5% female) were involved to develop the eHLS-Web3.0. The scale development included three steps: item pool generation, content validation, and exploratory factor analysis (EFA). In Study 2, 741 college students (mean age = 21.3 ± 1.4 years; 52.2% female) were recruited from four Chinese cities to validate the new-developed eHLS-Web3.0. The construct validity, convergent validity, concurrent validity, internal consistency reliability, test-retest reliability, and measurement invariance across gender, major, and region were examined by a series of statistical analyses, including confirmatory factor analysis (CFA), and multi-group CFA analysis with SPSS 25.0 and Mplus 7. RESULTS Based on the item pool of 374 statements collected during the conceptual developments, 24 items (4~10 items per subscale) were generated and adjusted after cognitive testing and content validity examination. Through the EFA, we finally developed a three-factorial eHLS-Web3.0, including Acquisition (8 items), Verification (6 items), and Application (10 items). In Study 2, CFAs supported the construct validity of the 24-item three-dimensional eHLS-Web3.0 (χ2 = 903.076, χ2/df =3.701, CFI = .924, TLI = .914, RMSEA = .060, SRMR = .051). The average variance extracted (AVE) of .58 and high correlation between eHLS-Web3.0 subscales and eHEALS (r = .725- .880, P < .001) supported good convergent validity and concurrent validity of the eHLS-Web3.0. Results also supported satisfactory internal consistency reliability (α = .976, ρ = .934 - .956) and test-retest reliability (r = .858, P < .001) of the scale. Multi-group CFAs demonstrated that the 24-item eHLS-Web3.0 to be invariant at all configural, metric, strong, and structural levels across gender (female/male), major (sport-related/medical/general), and region (Yinchuan/Kunming/Xiamen/Beijing). CONCLUSIONS The 24-item three-dimensional eHLS-Web3.0 is developed and verified to be a reliable and valid measurement of EHL in Web 3.0 context among Chinese college students.

scholarly journals Validation of the Spanish version of multidimensional inventory of perfectionism in young athletes

2019 ◽  
Vol 20 (1) ◽  
pp. 118-129 ◽  
Author(s):  
Francisco Atienza ◽  
Paul Appleton ◽  
Howard K. Hall ◽  
Isabel Castillo Fernández ◽  
Isabel Balaguer Solá
Keyword(s):  
Convergent Validity ◽  
Spanish Version ◽  
Football Players ◽  
Fit Indices ◽  
Young Athletes ◽  
Internal Reliability ◽  
Confirmatory Factor Analyses ◽  
Confirmatory Factor ◽  
Self Worth ◽  
Multidimensional Models

El Inventario Multidimensional de Perfeccionismo en Deporte (MIPS) es una medida deportiva específica del perfeccionismo desarrollado a partir de una combinación de diferentes modelos multidimensionales. Este estudio analiza las propiedades psicométricas del MIPS en una muestra de adolescentes deportistas. Participaron 429 futbolistas españoles con edades comprendidas entre 9 y 13 años. Los análisis factoriales confirmatorios mostraron que un modelo bidimensional obtenía adecuados índices de ajuste y los coeficientes alfa de Cronbach mostraron niveles de fiabilidad interna aceptables. La validez criterial y convergente del MIPS español ha sido confirmada analizando su asociación con medidas de ansiedad competitiva, auto-estima contingente y con otras dimensiones de perfeccionismo. Los resultados de este estudio sugieren que la versión española del MIPS es un instrumento específico para deporte, bien adaptado, fiable y válido para su utilización con jóvenes deportistas. The Multidimensional Inventory of Perfectionism in Sport (MIPS) is one sport specific measure of perfectionism developed on the basis of a combination of different multidimensional models. This study assesses the psychometrics of the MIPS-Y in a Spanish adolescent sport sample. Participants were 429 Spanish football players with ages ranging from 9 to 13 years. Confirmatory factor analyses showed that a two-dimensional model obtained adequate fit indices and Cronbach’s alpha coefficients showed acceptable levels of internal reliability. The criterion and convergent validity of the Spanish MIPS was also confirmed via its association with measures of sport anxiety, contingent self-worth and additional perfectionism dimensions. The results of this study suggest that the Spanish version of the MIPS is a well-adapted, reliable and valid sport specific instrument for employment with young athletes. O Perfeccionismo Multidimensional em Inventário Desportivo (MIPS) é uma medida específica de perfeccionismo desenvolvida a partir de uma combinação de diferentes modelos multidimensionais. Este estudo analisa as propriedades psicométricas da MIPS em uma amostra de atletas adolescentes. Havia 429 futebolistas espanhóis entre os 9 e os 13 anos. As análises fatoriais confirmatórias mostraram que um modelo bidimensional obteve índices de ajuste adequados e os coeficientes alfa de Cronbach mostraram níveis aceitáveis de confiabilidade interna. A validade convergente e criterial da MIPS espanhola foi confirmada pela análise da sua associação com medidas de ansiedade competitiva, auto-estima contingente e outras dimensões do perfeccionismo. Os resultados deste estudo sugerem que a versão espanhola da MIPS é um instrumento específico do esporte, bem adaptado, confiável e válido para uso com jovens atletas.

scholarly journals A Novel Method for Estimating Knee Angle Using Two Leg-Mounted Gyroscopes for Continuous Monitoring with Mobile Health Devices

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 2759 ◽  
Author(s):  
Eric Allseits ◽  
Kyoung Kim ◽  
Christopher Bennett ◽  
Robert Gailey ◽  
Ignacio Gaunaurd ◽  
...  
Keyword(s):  
Angular Velocity ◽  
Knee Joint ◽  
Convergent Validity ◽  
Continuous Monitoring ◽  
Joint Angle ◽  
Characteristic Point ◽  
Accelerometer Data ◽  
Knee Angle ◽  
Velocity Signal ◽  
Knee Joint Angle

Tele-rehabilitation of patients with gait abnormalities could benefit from continuous monitoring of knee joint angle in the home and community. Continuous monitoring with mobile devices can be restricted by the number of body-worn sensors, signal bandwidth, and the complexity of operating algorithms. Therefore, this paper proposes a novel algorithm for estimating knee joint angle using lower limb angular velocity, obtained with only two leg-mounted gyroscopes. This gyroscope only (GO) algorithm calculates knee angle by integrating gyroscope-derived knee angular velocity signal, and thus avoids reliance on noisy accelerometer data. To eliminate drift in gyroscope data, a zero-angle update derived from a characteristic point in the knee angular velocity is applied to every stride. The concurrent validity and construct convergent validity of the GO algorithm was determined with two existing IMU-based algorithms, complementary and Kalman filters, and an optical motion capture system, respectively. Bland–Altman analysis indicated a high-level of agreement between the GO algorithm and other measures of knee angle.

Effects of Bat Grip on Baseball Hitting Kinematics

2009 ◽  
Vol 25 (3) ◽  
pp. 203-209 ◽  
Author(s):  
Rafael F. Escamilla ◽  
Glenn S. Fleisig ◽  
Coop DeRenne ◽  
Marcus K. Taylor ◽  
Claude T. Moorman ◽  
...  
Keyword(s):  
Angular Velocity ◽  
Range Of Motion ◽  
Elbow Flexion ◽  
Linear Velocity ◽  
Elbow Extension ◽  
Kinematic Parameters ◽  
Time Duration ◽  
Motion System ◽  
Ball Contact ◽  
Pelvis Rotation

A motion system collected 120-Hz data from 14 baseball adult hitters using normal and choke-up bat grips. Six swings were digitized for each hitter, and temporal and kinematic parameters were calculated. Compared with a normal grip, the choke-up grip resulted in 1) less time during stride phase and swing; 2) the upper torso more opened at lead foot contact; 3) the pelvis more closed and less bat linear velocity at bat-ball contact; 4) less range of motion of the upper torso and pelvis during swing; 5) greater elbow flexion at lead foot contact; and 6) greater peak right elbow extension angular velocity. The decreased time during the stride phase when using a choke-up grip implies that hitters quicken their stride when they choke up. Less swing time duration and less upper torso and pelvis rotation range of motion using the choke-up grip supports the belief of many coaches and players that using a choke-up grip results in a “quicker” swing. However, the belief that using a choke-up grip leads to a faster moving bat was not supported by the results of this study.

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