Validity of a new contact mat system for evaluating vertical jump.

Júnior, Noé Gomes Borges; Borges, Lucas R.; Dias, Jonathan Ache; Wentz, Marcelo Diederichs; Mattos, Daniela; Petry, Raquel Denise; Domenech, Susana Cristina

doi:10.5016/1980-6574.2011v17n1p26

Cited by 3 publications

(2 citation statements)

References 14 publications

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“…The approximately 4% decrease in JH and decrease in standard deviation by approximately 30% is a discrepancy that would probably not be expected while using the same testing device. Contact mats are considered as an appropriate tool to test vertical JH for slow stretch-shortening cycle as in CMJ [34,51], and the particular mat used in this study was also suggested to be appropriate [41][42][43]. However, some authors indicate that contact mats are appropriate to test JH in collegeaged athletes but question its utility with the population of professional athletes as its accuracy seems to decrease with higher values of JH [52].…”

Section: Discussionmentioning

confidence: 95%

“…Fortunately, there is a variety of technologies that can be implemented as an effective replacement to a force platform. Infrared platforms [33], contact mats [34], inertial devices [35] or even a smartphone video application [36] may be used as a more affordable option to track vertical jump height. However, it should be noted that the results from different devices are not interchangeable, in order to evaluate changes in jump height over time [37].…”

Section: Introductionmentioning

confidence: 99%

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Changes in Countermovement Jump Height in Elite Volleyball Players in Two Competitive Seasons: Consideration on the Technique of Execution of the Jump

Masel,

Maciejczyk

2024

Applied Sciences

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Monitoring athletes’ well-being during the competitive season is a common practice in team sports, and countermovement jump (CMJ) is often introduced to monitor neuromuscular fatigue of the players. In this pilot observational study, we aimed to evaluate changes in jump performance in professional volleyball players during their two competitive seasons after introducing different executions of the jump test. Different execution of the flight phase of the jumps was introduced as a differentiating factor. Nine professional volleyball players (age: 23.3 ± 1.9 years; volleyball training experience: 10.4 ± 1.9 years; body height: 192.3 ± 8.3) performed CMJ measurements 1–2 times a week on a contact mat during two competitive seasons, and a total number of 1008 jumps (540 in season 1 and 468 in season 2) was collected. Players’ CMJ height significantly decreased (p < 0.05) in season 2 by approximately 4%, and standard deviation of the data reduced by approximately 30%. Our study confirms that the testing procedures need to be rigorous as different execution of the jump may be associated with changes in CMJ height. Execution of the jump should not be interchangeable using the same measurement device, and the technique introduced in season 2 seems to be more appropriate for this measurement device.

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Section: Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Changes in Countermovement Jump Height in Elite Volleyball Players in Two Competitive Seasons: Consideration on the Technique of Execution of the Jump

Masel,

Maciejczyk

2024

Applied Sciences

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Calculation of Jump Flight Time using a Mobile Device

Pires

García

Teixeira

2015

Proceedings of the International Conference on Health Informatics

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Creation and Validation of Chronojump-Boscosystem: A Free Tool to Measure Vertical Jumps. (Creación y validación de Chronojump-Boscosystem: un instrumento libre para la medición de saltos verticales).

Blas¹,

Padullés²,

Amo³

et al. 2012

rev. int. cienc. deporte

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Measuring the height of the vertical jump is an indicator of the strength and power of the lower body. The technological tools available to measure the vertical jump are black boxes and are not open to third-party verification or adaptation. We propose the creation of a measurement system called Chronojump-Boscosystem, consisting of open hardware and free software. Methods: A microcontroller was created and validated using a square wave generator and an oscilloscope. Two types of contact platforms were developed using different materials. These platforms were validated by the minimum pressure required for activation at different points by a strain gauge, together with the on/off time of our platforms in respect of the Ergojump-Boscosystem platform by a sample of 8 subjects performing submaximal jumps with one foot on each platform. Agile methodologies were used to develop and validate the software. Results: All the tools fall under the free software / open hardware guidelines and are, in that sense, free. The microcontroller margin of error is 0.1%. The validity of the fiberglass platform is 0.95 (ICC). The management software contains nearly 113.000 lines of code and is available in 7 languages.Key words: biomechanics; jump; free software; open hardware; chronojump-boscosystem. A b s t r a c tCorrespondencia/correspondence:Xavier de Blas Universitat Ramon Llull. España E-mail: xaviblas@gmail.com La medición de la altura del salto vertical es un indicador de la fuerza y potencia del tren inferior. Los instrumentos electrónicos disponibles para medir este salto son cajas negras que no permiten la verificación ni la adaptación por parte de terceros. Proponemos la creación de un sistema de medición llamado Chronojump-Boscosystem, que consiste en un hardware abierto y un software libre. Métodos: Se ha creado un microcontrolador y se ha validado usando un generador de ondas cuadradas y un osciloscopio. Se han desarrollado dos tipos de plataformas usando materiales distintos. Las plataformas se han validado determinando su sensibilidad en distintos puntos por medio de una célula de carga, y por comparación con la plataforma de contactos del sistema Ergojump-Boscosystem en una muestra de 8 sujetos, realizando saltos sub-máximos con un pie en cada plataforma. Se ha usado una metodología ágil para el desarrollo y validación del software. Resultados: Todas las partes que componen el sistema se han licenciado como software libre o hardware abierto. El margen de error del microcontrolador es de 0,1%. La validez de la plataforma de fibra de vidrio es de 0,95 (ICC). El software de gestión tiene cerca de 113 mil líneas de código y está disponible en 7 idiomas.Palabras clave: biomecánica; saltos; software libre; hardware abierto; chronojump-boscosystem. De Blas, X.; Padullés, J. M.; López del Amo, J.L.; . Creation and Validation of Chronojump-Boscosystem: A Free Tool to Measure Vertical Jumps. RICYDE. Rev. int. cienc. deporte. 30(8),

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Validity of a new contact mat system for evaluating vertical jump.

Cited by 3 publications

References 14 publications

Changes in Countermovement Jump Height in Elite Volleyball Players in Two Competitive Seasons: Consideration on the Technique of Execution of the Jump

Changes in Countermovement Jump Height in Elite Volleyball Players in Two Competitive Seasons: Consideration on the Technique of Execution of the Jump

Calculation of Jump Flight Time using a Mobile Device

Creation and Validation of Chronojump-Boscosystem: A Free Tool to Measure Vertical Jumps. (Creación y validación de Chronojump-Boscosystem: un instrumento libre para la medición de saltos verticales).

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