Assessing Interlimb Jump Asymmetry in Young Soccer Players: The My Jump 2 App

2021 ◽  
Vol 16 (1) ◽  
pp. 19-27
Author(s):  
Matheus Barbalho ◽  
Ana Francisca Rozin Kleiner ◽  
Bianca Callegari ◽  
Ramon Costa de Lima ◽  
Givago da Silva Souza ◽  
...  

Background: Jumps are important evaluation tools for muscle strength and power and for interlimb asymmetries. Different jump tests are well related to athletic performance, prediction of injury risk, and common motor gestures of several sports such as soccer. Low-cost mobile applications (apps) have gained popularity for this measure. The authors hypothesized that the My Jump 2 app would be a valid tool to assess drop-jump performance and interlimb asymmetry in soccer players. Methods: Eleven male soccer players took part in this study (18.2 [1.3] y, 69.9 [9.5] kg, 174 [6.6] cm). The athletes performed each test twice on a force plate (gold-standard method), while the jumps were recorded through the mobile app. Measures with the My Jump 2 app were applied by 2 evaluators, independently and in duplicate (interrater and intrarater reliability). The agreement analysis between both evaluations was done using an intraclass correlation coefficient and Bland–Altman plots. Results: Compared with the force platform, the app tested showed excellent reliability for the drop jump’s flight time and interlimb asymmetry (intraclass correlation coefficient > .98). For interlimb contact-time asymmetry, the values were 18.4 (9.9) and 19.1 (9.9) milliseconds for the My Jump 2 app and the force platform, respectively (P = .88). For flight-time asymmetries, the values were 389.7 (114.3) and 396.8 (112.5) milliseconds for the My Jump 2 app and the force platform, respectively (P = .88). Conclusion: The My Jump 2 app is a valid tool to assess drop-jump and interlimb asymmetry in soccer players.

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e4709 ◽  
Author(s):  
José Pino-Ortega ◽  
Javier García-Rubio ◽  
Sergio J. Ibáñez

The aim of this study was to test the validity and reliability of the inertial device WIMU (Realtrack Systems SL, Almería, Spain) for the assessment of the vertical jump, counter movement jump (CMJ) and squat jump (SJ). Fifteen soccer players were evaluated in two identical sessions separated by one week. In each session, participants performed three jumps of each type. The flight time was quantified by the inertial device WIMU and by a force platform (Twin Plates; Globus Sport and Health Technologies LLC, Codogné, Italy) at the same time. For the analysis of reliability of the flight time of the CMJ and the SJ, the intraclass correlation coefficient was used. The calculation of the concurrent validity was performed by using the Pearson correlation coefficient (r). This analysis was complemented with the realization of the Bland–Altman plots. For the analysis of reliability, the coefficient of variation and the standard error of the means were calculated. The analysis presented a high validity and reliability of the device. The results show the inertial device WIMU (Realtrack Systems SL, Almería, Spain) as a useful tool for measuring the jump capacity of the athletes, presenting immediate results in real time, on any type of surface and in a simple way since it does not need cables.


2019 ◽  
Vol 0 (Avance Online) ◽  
Author(s):  
Antenor Calandrini Azevedo ◽  
Deivison Soares Meninea ◽  
Arthur Pinto Magno ◽  
Thyago Martins Silva ◽  
Romulo Oliveira Sousa ◽  
...  

Resumo Objetivo: Investigar a confiabilidade e reprodutibilidade do aplicativo Jumpo® para medida de saltos verticais de lutadores. Método: Participaram 16 atletas de ambos os sexos com idade média de 19 ± 5 anos, estatura de 1.7 ± 0.1 m, massa corporal de 65 ± 15 kg. A presente investigação contabilizou dois encontros, nos quais foram realizados teste-reteste de ambos os instrumentos de avaliações para os seguintes saltos verticais: Countermovement Jump, Squat Jump e Drop Jump, medidos simultaneamente com o Tapete de Contato e o Jumpo®. Foram analisados o tempo de contato com o solo e a altura máxima de salto. Para análise estatística foi aplicado coeficiente de correlação intraclasse destinado às avaliações intra e inter-avaliadores. Já os comparativos entre Jumpo® e tapete de contato foram utilizados novamente o coeficiente de correlação intraclasse e a análise gráfica de Bland-Altman. Resultados: Concordâncias “quase perfeitas” para altura máxima em todos os saltos, tanto intra-avaliadores (CCI= 0.911-0.959), como inter-avaliadores (CCI= 0.939-0.951) e inter-instrumentos (CCI= 0.939-0.972) foram encontradas. Porém, o tempo de solo não apresentou concordância significante inter-instrumentos (p<0.360). Entretanto, foram encontrados valores inter-avaliadores estatisticamente significativos (p<0.001). Conclusão: O Jumpo® parece ser uma ferramenta válida e reprodutível para medida de altura máxima de saltos verticais, mas não para o tempo de contato com o solo. Sugere-se, portanto, que treinadores e técnicos podem ser encorajados a utilizar esta ferramenta para avaliação e monitoramento do desempenho de saltos em lutadores. Resumen Objetivo: Investigar la confiabilidad y reproducibilidad de la aplicación Jumpo® para la medida de saltos verticales en luchadores. Método: Participaron 16 atletas de ambos os sexos con edad media de 19 ± 5 años, estatura de 1.7 ± 0.1 m, masa corporal de 65 ± 15 kg. La presente investigación contabilizó dos encuentros en los que se realizaron pruebas y re-test de ambos instrumentos de evaluación para los siguientes saltos verticales: Countermovement Jump, Squat Jump y Drop Jump, medidos simultáneamente con la Superfície de Contacto y el Jumpo®. Se analizaron el tiempo de contacto con el suelo y la altura máxima de salto. Para el análisis estadístico se aplicó coeficiente de correlación intraclase destinado a las evaluaciones intra e inter-evaluadores. Los comparativos entre Jumpo® y la superfície de contacto se utilizaron nuevamente el coeficiente de correlación intraclase y el análisis gráfico de Bland-Altman. Resultados: Concordancias "casi perfectas" para altura máxima en todos los saltos, tanto intra-evaluadores (CCI = 0.911-0.959), como inter-evaluadores (CCI = 0.939-0.951) e inter-instrumentos (CCI = 0.939-0.972) encontrado. Sin embargo, el tiempo de contacto con el suelo no presentó concordancia significante inter-instrumentos (p <0.360). Sin embargo, se encontraron valores inter-evaluadores estadísticamente significativos (p <0.001). Conclusión: El Jumpo® parece ser una herramienta válida y reproducible para medida de altura máxima de saltos verticales, pero no para el tiempo de contacto. Se sugiere, por lo tanto, que entrenadores y técnicos puedan ser alentados a utilizar esta herramienta para evaluación y monitoreo del desempeño de saltos en luchadores. Abstract Objective: To investigate the reliability and reproducibility of the Jumpo® application for vertical jumping measurement. Method: 16 athletes of both sexes with a mean age of 19 ± 5 years, height of 1.7 ± 0.1 m, body mass of 65 ± 15 kg were included. The present investigation counted two meetings, in which test-retest of both assessment instruments for the following vertical jumps: Countermovement Jump, Squat Jump and Drop Jump, measured simultaneously with the Contact Mat and Jumpo®. Contact time with soil the ground and maximum jump height were analyzed. For statistical analysis, intraclass correlation coefficient was applied for intra- and inter-rater assessments. The comparisons between Jumpo® and contact mat performed by intraclass correlation coefficient and the Bland-Altman graphic analysis. Results: Almost perfect agreement for maximum height in all jumps, both intra-rater (ICC = 0.911-0.959), and inter-rater (ICC = 0.939-0.951) and inter-instrument (ICC = 0.939-0.972) were found. However, the contact time presented no significance (p <0.360) in relation to inter-instrument measurements. However, statistically significant inter-rater values ​​were found (p <0.001). Conclusion: Jumpo® seems to be a valid and reproducible tool for measuring maximum vertical jumps height, but not for contact time. It is suggested, therefore, that coaches and trainers can be encouraged to use this tool for evaluation and monitoring of jumping performance in fighters.


2020 ◽  
Vol 26 (2) ◽  
pp. 143-146
Author(s):  
Jose Heredia-Jimenez ◽  
Eva Orantes-Gonzalez

ABSTRACT Introduction: The numerous instruments used to measure jump height use different technologies and calculations that can provide variable results. Objective: This study compared the countermovement jump (CMJ) height assessed with a wearable 3D inertial measurement unit (IMU), using flight time and the numerical integration method with a force platform and photocells. Methods: Forty CMJs were analysed, starting from an upright standing position with the hands placed on the waist. Twenty healthy volunteers completed 2 CMJs, which were simultaneously assessed using an IMU placed on the subject's sacrum, a force platform (considered the gold standard method) and photocells. The maximum height of each CMJ was measured. Results: The results showed a significant overestimation (p<0.001) in jump height for the IMU using the numerical integration method when compared to the force platform (+7 cm). Excellent intraclass correlation coefficients (ICCs) were obtained with the flight time equations for the different types of measurement equipment. Fair to good ICCs were obtained with the IMU using the numerical integration method and force platform. Conclusion: In conclusion, the jump height obtained with the IMU using the numerical integration method showed the poorest agreement compared to the force platform. Level of evidence III; Prospective comparative study.


2016 ◽  
Vol 2016 ◽  
pp. 1-6
Author(s):  
Bo Zhang ◽  
Jianjun Gu ◽  
Xiaoxiao Zhang ◽  
Bin Yang ◽  
Zheng Wang ◽  
...  

Purpose. To explore the probability and variation in biomechanical measurements of rabbit cornea by a modified Scheimpflug device.Methods. A modified Scheimpflug device was developed by imaging anterior segment of the model imitating the intact eye at various posterior pressures. The eight isolated rabbit corneas were mounted on the Barron artificial chamber and images of the anterior segment were taken at posterior pressures of 15, 30, 45, 60, and 75 mmHg by the device. The repeatability and reliability of the parameters including CCT, ACD, ACV, and CV were evaluated at each posterior pressure. All the variations of the parameters at the different posterior pressures were calculated.Results. All parameters showed good intraobserver reliability (Cronbach’s alpha; intraclass correlation coefficient,α, ICC > 0.96) and repeatability in the modified Scheimpflug device. With the increase of posterior pressures, the ratio of CCT decreased linearly and the bulk modulus gradually reduced to a platform. The increase of ACD was almost linear with the posterior pressures elevated.Conclusions. The modified Scheimpflug device was a valuable tool to investigate the biomechanics of the cornea. The posterior pressure 15–75 mmHg range produced small viscoelastic deformations and nearly linear pressure-deformation response in the rabbit cornea.


2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Lloyd Roberts ◽  
Tom Rozen ◽  
Deirdre Murphy ◽  
Adam Lawler ◽  
Mark Fitzgerald ◽  
...  

Abstract Background Multiple screening Duplex ultrasound scans (DUS) are performed in trauma patients at high risk of deep vein thrombosis (DVT) in the intensive care unit (ICU). Intensive care physician performed compression ultrasound (IP-CUS) has shown promise as a diagnostic test for DVT in a non-trauma setting. Whether IP-CUS can be used as a screening test in trauma patients is unknown. Our study aimed to assess the agreement between IP-CUS and vascular sonographer performed DUS for proximal lower extremity deep vein thrombosis (PLEDVT) screening in high-risk trauma patients in ICU. Methods A prospective observational study was conducted at the ICU of Alfred Hospital, a major trauma center in Melbourne, Australia, between Feb and Nov 2015. All adult major trauma patients admitted with high risk for DVT were eligible for inclusion. IP-CUS was performed immediately before or after DUS for PLEDVT screening. The paired studies were repeated twice weekly until the DVT diagnosis, death or ICU discharge. Written informed consent from the patient, or person responsible, or procedural authorisation, was obtained. The individuals performing the scans were blinded to the others’ results. The agreement analysis was performed using Cohen’s Kappa statistics and intraclass correlation coefficient for repeated binary measurements. Results During the study period, 117 patients had 193 pairs of scans, and 45 (39%) patients had more than one pair of scans. The median age (IQR) was 47 (28–68) years with 77% males, mean (SD) injury severity score 27.5 (9.53), and a median (IQR) ICU length of stay 7 (3.2–11.6) days. There were 16 cases (13.6%) of PLEDVT with an incidence rate of 2.6 (1.6–4.2) cases per 100 patient-days in ICU. The overall agreement was 96.7% (95% CI 94.15–99.33). The Cohen’s Kappa between the IP-CUS and DUS was 0.77 (95% CI 0.59–0.95), and the intraclass correlation coefficient for repeated binary measures was 0.75 (95% CI 0.67–0.81). Conclusions There is a substantial agreement between IP-CUS and DUS for PLEDVT screening in trauma patients in ICU with high risk for DVT. Large multicentre studies are needed to confirm this finding.


Author(s):  
Daniela Claessens ◽  
Alexander K. Schuster ◽  
Ronald V. Krüger ◽  
Marian Liegl ◽  
Laila Singh ◽  
...  

AbstractIn this study, the test-retest-reliability as one aspect of reliability of metamorphopsia measurements using a computer-based measuring method was determined in patients with macular diseases. Metamorphopsia amplitude, position, and area were quantified using AMD – A Metamorphopsia Detector software (app4eyes GmbH & Co. KG, Germany) in patients with diabetic, myopic, or uveitic macular edema, intermediate or neovascular age-associated macular degeneration, epiretinal membrane, vitelliform maculopathy, Irvine-Gass syndrome, or macular edema due to venous retinal occlusion. The intraclass correlation coefficient (ICC) was calculated in order to determine the repeatability of two repeated measurements and was used as an indicator of the reliability of the measurements. In this study, metamorphopsia measurements were conducted on 36 eyes with macular diseases. Metamorphopsia measurements made using AMD – A Metamorphopsia Detector software were highly reliable and repeatable in patients with maculopathies. The intraclass correlation coefficient of all indices was excellent (0.95 – 0.97). For diseases of the vitreoretinal interface or macular diseases with intra- or subretinal edema, this metamorphopsia measurement represents a supplement for visual function testing in the clinic, as well as in clinical studies.


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