Concurrent validity and reliability of a functional electromechanical dynamometer to assess isometric mid-thigh pull performance

2021 ◽  
pp. 175433712110301
Author(s):  
Andrés Baena-Raya ◽  
David M. Díez-Fernández ◽  
Amador García-Ramos ◽  
Alberto Soriano-Maldonado ◽  
Manuel A. Rodríguez-Pérez
Keyword(s):  
Concurrent Validity ◽  
Force Production ◽  
Collegiate Athletes ◽  
Specific Force ◽  
Validity And Reliability ◽  
Force Development ◽  
Acceptable Alternative ◽  
Time Specific ◽  
Initial Force ◽  
Acceptable Reliability

The aim of this study was to examine the concurrent validity and reliability of a functional electromechanical dynamometer (FEMD) to assess the isometric mid-thigh pull (IMTP) kinetic variables: peak force (PF), rate of force development (RFD), and time-specific force values (50-, 100-, 150-, and 200-ms). Twenty-seven male collegiate athletes (age: 22.9 ± 1.9 years; stature: 184.8 ± 10.4 cm; body mass: 84.2 ± 11.8 kg) performed four IMTP trials simultaneously on a force platform and the FEMD. The PF variables calculated from performance of the IMTP on both devices were reliable (CV < 3%; ICC > 0.90) and valid (bias < 13.9 N; random error < 52.1 N; r = 1.00), but they showed heteroscedasticity of the errors ( R2 > 0.23). The RFD (CV > 10.88%; ICC < 0.76) and initial force (CV > 8.81%; ICC < 0.76) variables did not reach an acceptable reliability for any device, but they showed strong associations between them ( r range = 0.53–0.69). These results indicate that the FEMD is an acceptable alternative to assess athlete’s maximal force production (i.e. PF), but the data collected with FEMD and force plates should not be used interchangeably.

scholarly journals Normalization of Early Isometric Force Production as a Percentage of Peak Force During Multijoint Isometric Assessment

2020 ◽  
Vol 15 (4) ◽  
pp. 478-482
Author(s):  
Paul Comfort ◽  
Thomas Dos’Santos ◽  
Paul A. Jones ◽  
John J. McMahon ◽  
Timothy J. Suchomel ◽  
...  
Keyword(s):  
Coefficient Of Variation ◽  
Intraclass Correlation ◽  
Force Production ◽  
Correlation Coefficients ◽  
Collegiate Athletes ◽  
Peak Force ◽  
Specific Force ◽  
Intraclass Correlation Coefficients ◽  
Time Specific ◽  
Very High

Purpose: To determine the reliability of early force production (50, 100, 150, 200, and 250 ms) relative to peak force (PF) during an isometric mid-thigh pull and to assess the relationships between these variables. Methods: Male collegiate athletes (N = 29; age 21.1 [2.9] y, height 1.71 [0.07] m, body mass 71.3 [13.6] kg) performed isometric mid-thigh pulls during 2 separate testing sessions. Net PF and net force produced at each epoch were calculated. Within- and between-session reliabilities were determined using intraclass correlation coefficients and coefficient of variation percentages. In addition, Pearson correlation coefficients and coefficient of determination were calculated to examine the relationships between PF and time-specific force production. Results: Net PF and time-specific force demonstrated very high to almost perfect reliability both within and between sessions (intraclass correlation coefficients .82–.97; coefficient of variation percentages 0.35%–1.23%). Similarly, time-specific force expressed as a percentage of PF demonstrated very high to almost perfect reliability both within and between sessions (intraclass correlation coefficients .76–.86; coefficient of variation percentages 0.32%–2.51%). Strong to nearly perfect relationships (r = .615–.881) exist between net PF and time-specific net force, with relationships improving over longer epochs. Conclusion: Based on the smallest detectable difference, a change in force at 50 milliseconds expressed relative to PF > 10% and early force production (100, 150, 200, and 250 ms) expressed relative to PF of >2% should be considered meaningful. Expressing early force production as a percentage of PF is reliable and may provide greater insight into the adaptations to the previous training phase than PF alone.

The Schoolwork Engagement Inventory

2012 ◽  
Vol 28 (1) ◽  
pp. 60-67 ◽  
Author(s):  
Katariina Salmela-Aro ◽  
Katja Upadaya
Keyword(s):  
Secondary School ◽  
Concurrent Validity ◽  
Structural Equation ◽  
Self Esteem ◽  
Equation Modeling ◽  
Validity And Reliability ◽  
Older Students ◽  
School Students ◽  
Factor Solution ◽  
Upper Secondary

This study introduces the Schoolwork Engagement Inventory (EDA), which measures energy, dedication, and absorption with respect to schoolwork. Structural equation modeling was used to assess the validity and reliability of the inventory among students attending postcomprehensive schools. A total of 1,530 (769 girls, 761 boys) students from 13 institutions (six upper-secondary and seven vocational schools) completed the EDA 1 year apart. The results showed that a one-factor solution had the most reliability and fitted best among the younger students, whereas a three-factor solution was most reliable and fit best among the older students. In terms of concurrent validity, depressive symptoms and school burnout were inversely related, and self-esteem and academic achievement were positively associated with EDA. Boys and upper-secondary-school students experienced lower levels of schoolwork engagement than girls and vocational-school students.

scholarly journals PMC15 CONVERGENT, DISCRIMINANT, CONCURRENT VALIDITY AND RELIABILITY OF THE EQ-5D(CHILD): RESULTS

2007 ◽  
Vol 10 (6) ◽  
pp. A455 ◽  
Author(s):  
L Scalone ◽  
G Cavrini ◽  
S Broccoli ◽  
F Borghetti ◽  
B Pacelli ◽  
...  
Keyword(s):  
Concurrent Validity ◽  
Validity And Reliability

scholarly journals Criterion validity and reliability of the International Physical Activity Questionnaire – Hungarian short form against the RM42 accelerometer

2021 ◽  
Vol 21 (S1) ◽  
Author(s):  
Pongrác Ács ◽  
Réka Veress ◽  
Paulo Rocha ◽  
Tamás Dóczi ◽  
Bence László Raposa ◽  
...  
Keyword(s):  
Physical Activity ◽  
Concurrent Validity ◽  
International Physical Activity Questionnaire ◽  
Short Form ◽  
Sitting Time ◽  
Validity And Reliability ◽  
Retest Reliability ◽  
Physical Activity Questionnaire ◽  
Test Retest Reliability ◽  
Activity Questionnaire

Abstract Background Physical inactivity is a global phenomenon in European welfare countries. Proper monitoring is essential to measure the physical activity level of the population. Methods In the Hungarian cohort of the European Physical Activity and Sport Monitoring System (EUPASMOS) project, our participants (N = 598) completed sociodemographic questions and the International Physical Activity Questionnaire – short form (IPAQ-SF) survey. The validity and reliability of the subjective measurement tool were examined, IPAQ-SF outcomes were contrasted against triaxial RM42 accelerometer wore for 7 consecutive days. Results The IPAQ-SF showed moderate internal consistency (Cronbach Alpha = 0.647). The concurrent validity of the IPAQ-SF to triaxial accelerometer indicated a significant weak-to-moderate correlation (R = 0.111–0.338, p = 0.042; p < 0.001). The test-retest reliability showed a significant correlation between two measurements (R = 0.788–0.981, p < 0.001). Conclusion The Hungarian version of the IPAQ-SF had excellent test-retest reliability, but low-to-fair concurrent validity for moderate and vigorous physical activity, walking and sitting time, as compared to the objective criterion measure among Hungarian adults.

scholarly journals Concurrent Validity and Reliability of the Load-Velocity Relationship to Predict the One-Repetition Maximum during Three Weightlifting Derivatives

Kinesiology ◽  
2021 ◽  
Vol 53 (2) ◽  
pp. 215-225
Author(s):  
Ricardo Berton ◽  
Marcos Soriano ◽  
Demostenys David da Silva ◽  
Marcel Lopes dos Santos ◽  
Gustavo Teixeira ◽  
...  
Keyword(s):  
Measurement Errors ◽  
Concurrent Validity ◽  
Direct Test ◽  
Validity And Reliability ◽  
Repetition Maximum ◽  
Typical Error ◽  
Velocity Relationship ◽  
The One ◽  
Power Clean ◽  
Adequate Reliability

The study investigated the concurrent validity and reliability of the load-velocity relationship to predict the one-repetition maximum (1RM) of the power clean from the knee (PCK), high pull from the knee (HPK), and mid-thigh clean pull (MTCP). For each exercise, 12 participants performed two 1RM sessions tests and two sessions to measure the barbell’s load-velocity relationship at 30, 45, 60, 75, and 90% of 1RM. The velocity recorded at each load was used to establish the linear regression equation and, consequently, to predict 1RM value. A low validity between the 1RM direct test and predicted 1RM was observed for PCK (typical error [TE]=3.96 to 4.50 kg, coefficient of variation [CV]=4.68 to 5.27%, effect size [ES]=-0.76 to -0.58, Bland-Altman bias [BAB]=9.83 to 11.19 kg), HPK (TE=4.58 to 5.82 kg, CV=6.44 to 8.14%, ES=-0.40 to -0.39, BAB=3.52 to 4.17 kg), and MTCP (TE=6.33 to 8.08 kg, CV=4.78 to 6.16%, ES=-0.29 to -0.19, BAB=3.98 to 6.17 kg). Adequate reliability was observed for the 1RM direct test and for the predicted 1RM. However, based on Bland-Altman limits of agreement, lower measurement errors were obtained for the 1RM direct test in comparison to the predicted 1RM for all the exercises. In conclusion, the load-velocity relationship was not able to predict 1RM values with high accuracy in the PCK, HPK, and MTCP. Moreover, the 1RM direct test was the most reliable for PCK, HPK and MTCP.

scholarly journals The validity and reliability of a novel mobile app to measure agility performance in the physically active youth population

2020 ◽  
Vol 45 ◽  
pp. 85-92
Author(s):  
Juan A. Escobar-Alvarez ◽  
Rocio Carrasco ◽  
Pedro R. Olivares ◽  
Sebastián Feu ◽  
Robinson Ramírez-Velez ◽  
...  
Keyword(s):  
Correlation Analysis ◽  
Confidence Interval ◽  
Standard Error ◽  
Low Cost ◽  
Intraclass Correlation ◽  
Mobile App ◽  
Validity And Reliability ◽  
Physically Active ◽  
Youth Population ◽  
Acceptable Reliability

Agility is a key component of physical fitness in adolescents. However, the measurement of this variable is usually complex, requiring high cost instruments and complex software. To test the validity and reliability of a novel iPhone app (Lap Tracker Auto-timer) to measure agility performance among adolescents. Twenty-four physically active adolescents (15.7 ± 2.3 years old) participated in two testing sessions (separated by 7 days). They performed three 4 x 10 m agility test trials measured by Photocell or the iPhone app. The correlation analysis revealed high validity (r = .92; 95% confidence interval [CI] = .88 – .95), with a standard error of the estimate of 0.56 s (p < 0.001). The coefficient of variation (CV; 0.09) and intraclass correlation coefficient (ICC; .93; 95% CI = .85 – .97) showed an acceptable reliability. This study demonstrated that the iPhone App Lap Tracker Auto-timer could be a valid, reliable and low-cost tool to evaluate agility performance in adolescents. However, more studies are required to guarantee the utility of this app.

Musculotendinous stiffness: its relationship to eccentric, isometric, and concentric performance

1994 ◽  
Vol 76 (6) ◽  
pp. 2714-2719 ◽  
Author(s):  
G. J. Wilson ◽  
A. J. Murphy ◽  
J. F. Pryor
Keyword(s):  
Bench Press ◽  
Force Production ◽  
Force Transmission ◽  
Trained Subjects ◽  
Damped Oscillations ◽  
And Performance ◽  
Initial Force ◽  
The Relationship ◽  
Maximal Effort ◽  
Musculotendinous Stiffness

The purpose of this study was to quantify the relationship between musculotendinous stiffness and performance in eccentric, isometric, and concentric activities. Thirteen trained subjects performed a series of maximal effort eccentric, concentric, and isometric muscular contractions in a bench press-type movement. Additionally, subjects performed a series of quasi-static muscular contractions in a bench press movement. A brief perturbation was applied to the bar while these isometric efforts were maintained, and the resulting damped oscillations provided data pertaining to each subject's musculotendinous stiffness. Musculotendinous stiffness was significantly related to isometric and concentric performance (r = 0.57–0.78) but not to eccentric performance. These results are interpreted as demonstrating that the optimal musculotendinous stiffness for maximum concentric and isometric activities was toward the stiff end of the elasticity continuum. A stiffer musculotendinous unit may facilitate such performances by improving the force production capabilities of the contractile component, due to a combination of improved length and rate of shortening, and additionally by enhancing initial force transmission.

Concurrent validity and reliability of an iPhone app for the measurement of ankle dorsiflexion and inter-limb asymmetries

2018 ◽  
Vol 37 (3) ◽  
pp. 249-253 ◽  
Author(s):  
Carlos Balsalobre-Fernández ◽  
Natalia Romero-Franco ◽  
Pedro Jiménez-Reyes
Keyword(s):  
Concurrent Validity ◽  
Ankle Dorsiflexion ◽  
Validity And Reliability

Validity of a novel computerized screening test system for mild cognitive impairment

2018 ◽  
Vol 30 (10) ◽  
pp. 1455-1463 ◽  
Author(s):  
Jin-Hyuck Park ◽  
Minye Jung ◽  
Jongbae Kim ◽  
Hae Yean Park ◽  
Jung-Ran Kim ◽  
...  
Keyword(s):  
Cognitive Impairment ◽  
Mild Cognitive Impairment ◽  
Elderly People ◽  
Predictive Value ◽  
Screening Test ◽  
Concurrent Validity ◽  
Test System ◽  
Screening Tests ◽  
Validity And Reliability ◽  
Healthy Elderly

ABSTRACTBackground:The mobile screening test system for screening mild cognitive impairment (mSTS-MCI) was developed for clinical use. However, the clinical usefulness of mSTS-MCI to detect elderly with MCI from those who are cognitively healthy has yet to be validated. Moreover, the comparability between this system and traditional screening tests for MCI has not been evaluated.Objective:The purpose of this study was to examine the validity and reliability of the mSTS-MCI and confirm the cut-off scores to detect MCI.Method:The data were collected from 107 healthy elderly people and 74 elderly people with MCI. Concurrent validity was examined using the Korean version of Montreal Cognitive Assessment (MoCA-K) as a gold standard test, and test–retest reliability was investigated using 30 of the study participants at four-week intervals. The sensitivity, specificity, positive predictive value, and negative predictive value (NPV) were confirmed through Receiver Operating Characteristic (ROC) analysis, and the cut-off scores for elderly people with MCI were identified.Results:Concurrent validity showed statistically significant correlations between the mSTS-MCI and MoCA-K and test–rests reliability indicated high correlation. As a result of screening predictability, the mSTS-MCI had a higher NPV than the MoCA-K.Conclusions:The mSTS-MCI was identified as a system with a high degree of validity and reliability. In addition, the mSTS-MCI showed high screening predictability, indicating it can be used in the clinical field as a screening test system for mild cognitive impairment.

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