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.

scholarly journals An Experimental Study on the Validity and Reliability of a Smartphone Application to Acquire Temporal Variables during the Single Sit-to-Stand Test with Older Adults

Sensors ◽  
2021 ◽  
Vol 21 (6) ◽  
pp. 2050
Author(s):  
Diogo Luís Marques ◽  
Henrique Pereira Neiva ◽  
Ivan Miguel Pires ◽  
Eftim Zdravevski ◽  
Martin Mihajlov ◽  
...  
Keyword(s):  
Older Adults ◽  
Low Cost ◽  
Intraclass Correlation ◽  
Smartphone Application ◽  
Ease Of Use ◽  
Systematic Bias ◽  
Validity And Reliability ◽  
Stand Test ◽  
Sit To Stand ◽  
Temporal Variables

Smartphone sensors have often been proposed as pervasive measurement systems to assess mobility in older adults due to their ease of use and low-cost. This study analyzes a smartphone-based application’s validity and reliability to quantify temporal variables during the single sit-to-stand test with institutionalized older adults. Forty older adults (20 women and 20 men; 78.9 ± 8.6 years) volunteered to participate in this study. All participants performed the single sit-to-stand test. Each sit-to-stand repetition was performed after an acoustic signal was emitted by the smartphone app. All data were acquired simultaneously with a smartphone and a digital video camera. The measured temporal variables were stand-up time and total time. The relative reliability and systematic bias inter-device were assessed using the intraclass correlation coefficient (ICC) and Bland-Altman plots. In contrast, absolute reliability was assessed using the standard error of measurement and coefficient of variation (CV). Inter-device concurrent validity was assessed through correlation analysis. The absolute percent error (APE) and the accuracy were also calculated. The results showed excellent reliability (ICC = 0.92–0.97; CV = 1.85–3.03) and very strong relationships inter-devices for the stand-up time (r = 0.94) and the total time (r = 0.98). The APE was lower than 6%, and the accuracy was higher than 94%. Based on our data, the findings suggest that the smartphone application is valid and reliable to collect the stand-up time and total time during the single sit-to-stand test with older adults.

scholarly journals The Disablement in the Physically Active Scale, Part II: The Psychometric Properties of an Outcomes Scale for Musculoskeletal Injuries

2010 ◽  
Vol 45 (6) ◽  
pp. 630-641 ◽  
Author(s):  
Luzita I. Vela ◽  
Craig R. Denegar
Keyword(s):  
Confidence Interval ◽  
Psychometric Properties ◽  
Goodness Of Fit ◽  
Pearson Correlation ◽  
Intraclass Correlation ◽  
Acute Injury ◽  
Global Functioning ◽  
Physically Active ◽  
Clinically Important Difference ◽  
Fit Index

Abstract Context: Outcomes assessment is an integral part of ensuring quality in athletic training, but few generic instruments have been specifically designed to measure disablement in the physically active. Objective: To assess the psychometric properties of the Disablement in the Physically Active Scale (DPA), a patient-report, generic outcomes instrument. Design: Observational study. Setting: We collected data in 5 settings with competitive and recreational athletes. Participants entered into the study at 3 distinct points: (1) when healthy and (2) after an acute injury, or (3) after a persistent injury. Patients or Other Participants: Measures were obtained from 368 baseline participants (202 females, 166 males; age  =  20.1 ± 3.8 years), 54 persistent participants (32 females, 22 males; age  =  22.0 ± 8.3 years), and 28 acutely injured participants (8 females, 20 males; age  =  19.8 ± 1.90 years). Main Outcome Measure(s): We assessed internal consistency with a Cronbach α and test-retest reliability with intraclass correlation (2,1) values. The scale's factor structure was assessed with a hierarchical confirmatory factor analysis. Concurrent validity was assessed with a Pearson correlation. Responsiveness was calculated using a receiver operating characteristic curve and a minimal clinically important difference value. Results: The Cronbach α scores for the DPA were 0.908 and 0.890 in acute and persistent groups, respectively. The intraclass correlation (2,1) value of the DPA was 0.943 (95% confidence interval  =  0.885, 0.972). The fit indices values were 1.89, 0.852, 0.924, 0.937, and 0.085 (90% confidence interval  =  0.066, 0.103) for the minimum sample discrepancy divided by degrees of freedom, goodness-of-fit index, Tucker-Lewis Index, comparative fit index, and root mean square error of approximation, respectively. The DPA scores accounted for 51% to 56.4% of the variation in global functioning scores. The area under the curve was statistically significant, and the minimally clinically important difference values were established. Conclusions: The DPA is a reliable, valid, and responsive instrument.

scholarly journals Development of a Mobile Phone App for Measuring Striking Response Time in Combat Sports: Cross-Sectional Validation Study

10.2196/14641 ◽  
2019 ◽  
Vol 7 (11) ◽  
pp. e14641
Author(s):  
Victor Coswig ◽  
Jader Sant' Ana ◽  
Maicon Nascimento Coelho ◽  
Antonio Renato Pereira Moro ◽  
Fernando Diefenthaeler
Keyword(s):  
Response Time ◽  
High Speed ◽  
Pearson Correlation ◽  
Intraclass Correlation ◽  
Mobile App ◽  
Combat Sports ◽  
Validity And Reliability ◽  
Cross Sectional ◽  
Significant Difference ◽  
Dependent Samples

Background TReaction is a mobile app developed to determine strike response time at low cost and with easy application in combat sports. However, the validity and accuracy of the response time obtained by the TReaction app has not yet been evaluated. Objective This study aimed to test the validity and reliability of the TReaction app in measuring motor response time in combat sports. Methods A total of two athletes performed 59 strikes to assess the response time upon visual stimulus using the TReaction app simultaneously with a high-speed camera. Accuracy of the measure was verified using a computer simulator programmed to discharge visual stimuli and obtain the response time. Pearson correlation, Student t test for dependent samples, and the Bland-Altman analysis were performed. Accuracy was verified using the intraclass correlation coefficient. Effect size (g) and the typical error of measurement (TEM) were calculated. The significance level was set at P<.05. Results No significant difference (P=.56) was found between both systems. The methods presented a very strong correlation (r=0.993). The magnitude of differences was trivial (g<0.25), and TEM was 1.4%. These findings indicate a high accuracy between the computer screen and the mobile app measures to determine the beginning of the task and the response time. Conclusions Our findings suggest that the TReaction app is a valid tool to evaluate the response time in combat sports athletes.

scholarly journals Feasibility and Reliability of the Spondyloarthritis Research Consortium of Canada Sacroiliac Joint Structural Score in Children

2018 ◽  
Vol 45 (10) ◽  
pp. 1411-1417 ◽  
Author(s):  
Pamela F. Weiss ◽  
Walter P. Maksymowych ◽  
Robert G. Lambert ◽  
Jacob L. Jaremko ◽  
David M. Biko ◽  
...  
Keyword(s):  
Sacroiliac Joint ◽  
Interobserver Reliability ◽  
Intraclass Correlation ◽  
Correlation Coefficients ◽  
Face Validity ◽  
Validity And Reliability ◽  
Structural Progression ◽  
Juvenile Spondyloarthritis ◽  
Research Consortium ◽  
Acceptable Reliability

Objective.There is a critical need for measures to evaluate structural progression in the pediatric sacroiliac joint (SIJ). We aimed to evaluate the construct validity and reliability of the Spondyloarthritis Research Consortium of Canada SIJ Structural Score (SSS) in children with suspected or confirmed juvenile spondyloarthritis.Methods.The SSS assesses structural lesions of the SIJ on magnetic resonance imaging (MRI) through the cartilaginous part of the joint. We conducted 3 sequential reading exercises with 6 readers (1 adult and 3 pediatric radiologists, 1 adult and 1 pediatric rheumatologist). Each exercise was preceded by a calibration module. Interobserver reliability was assessed using intraclass correlation coefficients (ICC). Prespecified acceptable reliability thresholds were ICC > 0.5 for erosion, backfill, and sclerosis, and ICC > 0.7 for ankylosis and fat metaplasia.Results.The SSS had face validity and was feasible to score in pediatric cases for all 3 reading exercises. Of the cases used in the 3 exercises, 58% were male and the median age was 14 years (range 6.8–18.7 yrs). After calibration, median ICC across all readers for each SSS component were the following: erosion 0.67 (interquartile range 0.54–0.80), backfill 0.33 (0.19–0.52), fat metaplasia 0.74 (0.62–0.85), sclerosis 0.63 (0.48–0.77), and ankylosis 0.44 (0.28–0.62). Prespecified reliability thresholds were achieved in the third exercise for erosion, sclerosis, and fat metaplasia but not for backfill or ankylosis.Conclusion.The SSS was feasible to score and had acceptable reliability for pediatric SIJ MRI evaluation. The ICC improved with additional calibration and reading exercises, even for readers with limited experience.

Validity and Reliability of a New Device (WIMU®) for Measuring Hamstring Muscle Extensibility

2017 ◽  
Vol 38 (09) ◽  
pp. 691-695 ◽  
Author(s):  
José Muyor
Keyword(s):  
Standard Error ◽  
Intraclass Correlation ◽  
Correlation Coefficients ◽  
Systematic Bias ◽  
Hamstring Muscle ◽  
Validity And Reliability ◽  
Retest Reliability ◽  
New Device ◽  
Test Retest Reliability ◽  
Straight Leg Raise

AbstractThe aims of the current study were 1) to evaluate the validity of the WIMU® system for measuring hamstring muscle extensibility in the passive straight leg raise (PSLR) test using an inclinometer for the criterion and 2) to determine the test-retest reliability of the WIMU® system to measure hamstring muscle extensibility during the PSLR test. 55 subjects were evaluated on 2 separate occasions. Data from a Unilever inclinometer and WIMU® system were collected simultaneously. Intraclass correlation coefficients (ICCs) for the validity were very high (0.983–1); a very low systematic bias (−0.21°–−0.42°), random error (0.05°–0.04°) and standard error of the estimate (0.43°–0.34°) were observed (left–right leg, respectively) between the 2 devices (inclinometer and the WIMU® system). The R2 between the devices was 0.999 (p<0.001) in both the left and right legs. The test-retest reliability of the WIMU® system was excellent, with ICCs ranging from 0.972–0.995, low coefficients of variation (0.01%), and a low standard error of the estimate (0.19–0.31°). The WIMU® system showed strong concurrent validity and excellent test-retest reliability for the evaluation of hamstring muscle extensibility in the PSLR test.

scholarly journals Development of a Mobile Phone App for Measuring Striking Response Time in Combat Sports: Cross-Sectional Validation Study (Preprint)

2019 ◽  
Author(s):  
Victor Coswig ◽  
Jader Sant' Ana ◽  
Maicon Nascimento Coelho ◽  
Antonio Renato Pereira Moro ◽  
Fernando Diefenthaeler
Keyword(s):  
Response Time ◽  
High Speed ◽  
Pearson Correlation ◽  
Intraclass Correlation ◽  
Mobile App ◽  
Combat Sports ◽  
Validity And Reliability ◽  
Cross Sectional ◽  
Significant Difference ◽  
Dependent Samples

BACKGROUND TReaction is a mobile app developed to determine strike response time at low cost and with easy application in combat sports. However, the validity and accuracy of the response time obtained by the TReaction app has not yet been evaluated. OBJECTIVE This study aimed to test the validity and reliability of the TReaction app in measuring motor response time in combat sports. METHODS A total of two athletes performed 59 strikes to assess the response time upon visual stimulus using the TReaction app simultaneously with a high-speed camera. Accuracy of the measure was verified using a computer simulator programmed to discharge visual stimuli and obtain the response time. Pearson correlation, Student <italic>t</italic> test for dependent samples, and the Bland-Altman analysis were performed. Accuracy was verified using the intraclass correlation coefficient. Effect size (g) and the typical error of measurement (TEM) were calculated. The significance level was set at <italic>P</italic>&lt;.05. RESULTS No significant difference (<italic>P</italic>=.56) was found between both systems. The methods presented a very strong correlation (<italic>r</italic>=0.993). The magnitude of differences was trivial (g&lt;0.25), and TEM was 1.4%. These findings indicate a high accuracy between the computer screen and the mobile app measures to determine the beginning of the task and the response time. CONCLUSIONS Our findings suggest that the TReaction app is a valid tool to evaluate the response time in combat sports athletes.

scholarly journals Map-based assessment of older adults’ life space: validity and reliability

2020 ◽  
Vol 17 (1) ◽  
Author(s):  
Timo Hinrichs ◽  
Adriana Zanda ◽  
Michelle P. Fillekes ◽  
Pia Bereuter ◽  
Erja Portegijs ◽  
...  
Keyword(s):  
Older Adults ◽  
Confidence Interval ◽  
Convex Hull ◽  
Intraclass Correlation ◽  
Correlation Coefficients ◽  
Maximum Distance ◽  
Validity And Reliability ◽  
Life Space ◽  
Intraclass Correlation Coefficients ◽  
Test Retest Reliability

Abstract Background Map-based tools have recently found their way into health-related research. They can potentially be used to quantify older adults’ life-space. This study aimed to evaluate the validity (vs. GPS) and the test-retest reliability of a map-based life-space assessment (MBA). Methods Life-space of one full week was assessed by GPS and by MBA. MBA was repeated after approximately 3 weeks. Distance-related (mean and maximum distance from home) and area-related (convex hull, standard deviational ellipse) life-space indicators were calculated. Intraclass correlations (MBA vs. GPS and test-retest) were calculated in addition to Bland-Altman analyses (MBA vs. GPS). Results Fifty-eight older adults (mean age 74, standard deviation 5.5 years; 39.7% women) participated in the study. Bland-Altman analyses showed the highest agreement between methods for the maximum distance from home. Intraclass correlation coefficients ranged between 0.19 (95% confidence interval 0 to 0.47) for convex hull and 0.72 (95% confidence interval 0.52 to 0.84) for maximum distance from home. Intraclass correlation coefficients for test-retest reliability ranged between 0.04 (95% confidence interval 0 to 0.30) for convex hull and 0.43 (95% confidence interval 0.19 to 0.62) for mean distance from home. Conclusions While acceptable validity and reliability were found for the distance-related life-space parameters, MBA cannot be recommended for the assessment of area-related life-space parameters.

Development and validation of a questionnaire measuring knowledge, attitudes, and practices (KAP) to healthy eating and activity patterns in school children (HEAPS)

2021 ◽  
pp. 026010602098235 ◽  
Author(s):  
Panchali Moitra ◽  
Preeti Verma ◽  
Jagmeet Madan
Keyword(s):  
Correlation Coefficient ◽  
Healthy Eating ◽  
School Children ◽  
Content Validity ◽  
Activity Patterns ◽  
Intraclass Correlation ◽  
Validity And Reliability ◽  
Attitudes And Practices ◽  
Item Content ◽  
Knowledge Attitudes And Practices

Background: Development of culturally appropriate and psychometrically sound instruments that measure knowledge and health behaviors of children will help to inform appropriate interventions. Aim: To develop and test the validity and reliability of a questionnaire measuring knowledge, attitudes, and practices to healthy eating and activity patterns in school children in India. Methods: Review of literature, focus-group discussions, and theoretical constructs of the Health Belief Model guided the development of an item pool. Face and content validity were assessed by children and a panel of experts and the item content validity, item difficulty, and discrimination indices were calculated. Construct validity was determined using the principal axis method of exploratory factor analysis among a cross-sectional sample of children ( n=252). Internal consistency (Cronbach α values >0.7) and test-retest reliability (intraclass correlation coefficient values >0.75) were estimated. Results: Item content validity index for clarity and relevance were satisfactory (>0.80) and internal consistency for knowledge (Kuder-Richardson 20 = 0.832), attitude (Cronbach’s α = 0.912), and practice items (Cronbach’s α = 0.769) were good. Four factors (children’s eating habits, family dietary practices, and consumption of healthy and unhealthy foods) and two factors (moderate to vigorous activities and sedentary activities) explained 67.7% and 48.2% of the total variance in practice items. Intraclass correlation coefficient estimates ranged from good to excellent (0.72–0.99). Conclusions: The results of the validity and reliability of the 84-item knowledge, attitudes, and practices to healthy eating and activity patterns in schoolchildren questionnaire were promising. The detailed description of the methodology employed may prove useful to researchers conducting similar studies in children.

scholarly journals Validity and reliability of the lederman Prenatal Self-Evaluation Questionnaire (PSEQ) in Brazil

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Janiny Lima e Silva ◽  
Matheus de Sousa Mata ◽  
Saionara Maria Aires Câmara ◽  
Íris do Céu Clara Costa ◽  
Kleyton Santos de Medeiros ◽  
...  
Keyword(s):  
Factor Analysis ◽  
Confirmatory Factor Analysis ◽  
Pregnant Women ◽  
Internal Consistency ◽  
Intraclass Correlation ◽  
Psychosocial Adaptation ◽  
Validity And Reliability ◽  
Evaluation Questionnaire ◽  
Self Evaluation ◽  
Confirmatory Factor

Abstract Background The Lederman Prenatal Self-Evaluation Questionnaire (PSEQ) is used to assess psychosocial adaptation to pregnancy, labor, childbirth, and maternity. The PSEQ is a tool used in various countries and has been translated into Portuguese; however, it needs to be validated in Brazil. This study aimed to analyze the validity and reliability of the PSEQ in Brazilian pregnant women. Method This methodological validity study investigated internal consistency and reliability using Cronbach’s alpha and intraclass correlation coefficients. Construct validity was assessed using Pearson’s correlation between domains and confirmatory factor analysis. To assess concurrent validity, Pearson’s correlation between the different domains of the PSEQ and Prenatal Psychosocial Profile-Portuguese Version (PPP-VP) was determined. The level of significance was set at 5%. Results This study included 399 pregnant women in the northeastern region of Brazil. The internal consistency and reliability of the total PSEQ score were high (Cronbach's alpha = 0.89; intraclass correlation coefficient = 0.95). Validity analysis showed positive and significant correlations between all PSEQ domains, ranging from 0.14 to 0.56. Confirmatory factor analysis demonstrated the following values of goodness of fit: RMSEA = 0.05, SRMR = 0.08, CFI = 0.61, χ2/df = 1.77. The discriminant and concurrent validities of the PSEQ were confirmed. Conclusions The Portuguese version of the PSEQ has adequate psychometric properties and is a valid and reliable tool to evaluate psychosocial adaptation to pregnancy in Brazilian pregnant women.

scholarly journals Satellite-Based Personal UV Dose Estimation

Atmosphere ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 268
Author(s):  
Todd C. Harris ◽  
Laurent Vuilleumier ◽  
Claudine Backes ◽  
Athanasios Nenes ◽  
David Vernez
Keyword(s):  
Measurement Errors ◽  
Low Cost ◽  
Public Health Research ◽  
Mobile App ◽  
Population Exposure ◽  
Dose Estimation ◽  
Annual Dose ◽  
Significant Step ◽  
Uv Dose ◽  
Dosimetry Measurement

Epidemiology and public health research relating to solar ultraviolet (UV) exposure usually relies on dosimetry to measure UV doses received by individuals. However, measurement errors affect each dosimetry measurement by unknown amounts, complicating the analysis of such measurements and their relationship to the underlying population exposure and the associated health outcomes. This paper presents a new approach to estimate UV doses without the use of dosimeters. By combining new satellite-derived UV data to account for environmental factors and simulation-based exposure ratio (ER) modelling to account for individual factors, we are able to estimate doses for specific exposure periods. This is a significant step forward for alternative dosimetry techniques which have previously been limited to annual dose estimation. We compare our dose estimates with dosimeter measurements from skiers and builders in Switzerland. The dosimetry measurements are expected to be slightly below the true doses due to a variety of dosimeter-related measurement errors, mostly explaining why our estimates are greater than or equal to the corresponding dosimetry measurements. Our approach holds much promise as a low-cost way to either complement or substitute traditional dosimetry. It can be applied in a research context, but is also fundamentally well-suited to be used as the basis for a dose-estimating mobile app that does not require an external device.

Sign in / Sign up

Export Citation Format

Share Document