Validity & Reliability of WIMU for measuring hamstring muscle extensibility

Hamstring extensibility is an important component of physical fitness and spinal health. In this context, extensibility is understood as the ability of muscle tissue to lengthen or stretch beyond the resting length. Short-hamstring syndrome is one of the main risk factors for athletic injuries, low back pain, etc.

The aims of the current study were to evaluate the validity of WIMU for measuring hamstring muscle extensibility in the passive straight leg raise (PSLR) test using an inclinometer for the criterion and determine the test-retest reliability of the WIMU to measure hamstring muscle extensibility during the PSLR test.

55 subjects were evaluated on 2 separate occasions. WIMU showed strong concurrent validity and excellent test-retest reliability for the evaluation of hamstring muscle extensibility in the PSLR test.

Infographics by José María Oliva

Validity & Reliability of a GPS device for quantifying athletes´ sprints and movement demands specific to team sports

The objective of this study was to study the validity and reliability of WIMU during 10m and 30m sprints, during team sports specific movements and the reliability during very high speeds (> 30 km/h).

GPS systems are commonly used to analysis football performance during either trainings or matches. While many studies have investigated the validity and reliability of these devices, there is a lack of objective procedures regarding synchronization with gold standards such as real distance or timing gates. This the first study that uses a high-speed video camera synchronized via software with a GPS device and timing gates to determine the sprint start point and sprint split. In conclusion, WIMU showed to be valid and reliable for measuring sprints at speed higher than 20 km/h as well as team sport movements

Infographics by José María Oliva

Reliability & Validity of WIMU for measuring velocity during resistance exercises

First study to test the reliability and validity of WIMU enclosed to a Smith’s machine bar in order to measure velocity in back squat. This study had two main goals. The first was to determine the reliability of the WIMU for mean velocity measurements during resistance exercises at 40% and 80% 1 repetition maximum (maximum weight you can lift with maximum effort in a single repetition). The second was to compare the results for the WIMU to a linear encoder (gold standard) for mean velocity measurements when clipped to the bar during back squat exercises using the Smith machine.

23 trained men aged 22.3 ± 3.2 years participated in this study. At maximum velocity in the concentric phase, they performed 10 repetitions with 40% 1 repetition maximum and eight repetitions with 80% 1 repetition maximum while using the WIMU and T-Force linear encoder simultaneously to record data.

In conclusion, the findings of this study suggest that WIMU is a reliable and valid tool for the assessment of mean velocity during the back squat exercise using the Smith machine. These findings could help coaches and sport researchers evaluate athletes performing resistance exercises similar to squats with a reliable, valid and portable tool.

Infographics by José María Oliva

Trunk stability assesment using an inertial device (WIMU)

The purpose of this research was to perform a trunk strength assessment of protocols described in the literature using accelerometry, by means of CV and ApEn entropy calculations. In addition, to check differences in CV and ApEn variables depending on the type of exercise, as a secondary objective. Twenty-four male subjects who were part of a football team participating in the Third Division:

  •  Age: 23,4 ± 2,73 years
  • Height: 1,75 ± 0,09 cm
  • Weight: 74,3 ± 6,19 kg
  • -BMI (Body mass index): 21,51 ± 3,47 kg/m2)

This data was recorded by means of an inertial device located in the center of mass (L3) and their accelerometric signals were analyzed by two statistics: coefficient of variation (CV) and approximate entropy (ApEn).

Significant differences were found in the value of CV and ApEn in all exercises except between PP and PL in ApEn (p <0.05). The data were distributed in low, medium and high values of CV and ApEn of the participants. A trunk strength-stability assessment using an inertial device or multi-sensors is proposed as a practical method for strength and conditioning coaches. Also, the application of the statistics CV and ApEn for the analysis of signals in stability exercises is recommended.

infographics by José María Oliva

 

Wimu Pro con la FIFA en Melbourne

Realtrack Systems sigue avanzando y sigue liderando en el mundo de la tecnología deportiva.

Carlos Padilla (Director Técnico) y Mark Siddle (Director Marketing) durante los tests FIFA en Australia

A inicios de la segunda quincena de Febrero la FIFA reunió a las mejores compañías del sector para probar y estudiar sus sistemas de seguimiento de jugadores y evaluación de rendimiento. La encargada de este estudio es la Universidad de Victoria (Australia), quien informará a la FIFA de sus conclusiones con respecto a cada uno de los participantes durante estas jornadas.

Nuestra experiencia ha sido muy positiva. Hemos podido probar nuestro sistema y ver in situ una comparación directa con respecto a los sistemas disponibles en el mercado, Contrastar en vivo como Wimu Pro aventaja tanto a sus competidores por su facilidad de instalación y uso así como en la recogida, procesamiento y transferencia de datos es algo que nos motiva a seguir desarrollando nuestros productos con la misma pasión y filosofía como hemos hecho desde el primer día.

Lee nuestra nota de prensa oficial en español y en inglés.

Permaneced atentos porque 2017 será un año muy interesante,

CARVIREN case of study

1CARVIREN has been one of our favorite projects. This experiment (inside Experimedia) has been a challange. Not only for the first use of muscle oxygen saturation in an European Project, but also due the development of the Trampolin widget.

Currently, the machines to measure fligth time in this olimpic discipline is quite expensive and difficult to use. With Carviren we wanted to do it with WIMU, synchronizing with video, heart rate and oxigen saturation and display all of it in a friendly website.

Do you want to know more about the challenges and how we faced them? Check out our CARVIREN case of Study.

“CARVIREN case of study” is available in English on Amazon and Create Space or pdf download.

Participación de RealTrack Systems en el III International Congress on Team Sport de la Universidad Pablo Olávide de Sevilla

Este fin de semana pasado, tuvimos la oportunidad de asistir al III International Congress on Team Sport (ICTS); organizado por el Master http://masterdefutbol.com/ en la Universidad Pablo Olávide de Sevilla (UPO).

En este congreso, se tuvo la oportunidad de compartir ciencia y experiencia, con los asistentes que se acercaron a él.

Sin títuloRealTrack Systems asistió con un stand; en el cual, los asistentes al congreso, tuvieron oportunidad de conocer Wimu de primera mano. Además impartimos un taller sobre Wimu, donde los compañeros Carlos Padilla y José Pino (@josepinoortega) mostraron Wimu en tiempo real. Contamos con la inestimable colaboración de Alejandro Muñoz López (@aml_fc), preparador físico de la Selección Letona de Fútbol. Alejandro nos relató su experiencia como usuario.

Los conferenciantes de este año fueron de un nivel altísimo; con figuras internacionales. Un ejemplo especialmente impactante, fue la conferencia de Aaron Coutts (@aaronjcoutts), que nos contó su experiencia con sensores y dispositivos para la monitorización. Ambos, coincidimos en el enfoque que defiende el uso de más sensores como acelerómetros, giroscopios, etc.; además del ya conocido, GPS.

Desde RealTrack Systems queremos mostrar nuestro agradecimiento a Aaron Coutts, por su empatía y entusiasmo con Wimu. Y al doctor Pablo Floria (@pablofloria), de la UPO, por su invitación a participar en este evento.

 

Analyzing a Football match with Wimu

We leave you here some the pictures from our colleague José Pino Ortega. We’ve collected some of the most interesting pictures of his daily trainings with youth football teams. These tactical, cinematic and physiologic analysis have been conducted with Wimu, Qüiko y Wisee. This collection has been conducted with our Quiko tool: the  GIS (Geographic Information Systems). This is a sample of what you can do with Wimu and Qüiko:

(Click on the image for full size)

1. Visual representation of three players in a Football 7 pitch:

1

 

2. Heatmap of one of the players during the game:

 

3. Spatial analyze of the defence. Players positions (with and without tail: 1, 2 and 4 players)2

 

4. Heart Rate projection  by intervals:

3

 

5. Sprints projection by intervals:

4-sprints

 

6. Distance relations between players and pitch’s elements:

relations

 

7. Area relations between players and pitch’s elements:

relation2

 

Análisis de un partido de fútbol con WIMU

Aquí os dejamos algunas de las imágenes de nuestro compañero José Pino Ortega. Hemos recopilado algunas de las más interesantes de sus entrenamientos del día a día en fútbol base, en estos realiza análisis cinemática, tácticos y fisiológicos utilizando Wimu, Qüiko y Wisee. Esta recopilación está más centrada en el uso de nuestra herramienta GIS (Sistema de información geográfica), integrada en el software Qüiko. Esto es una muestra de lo que se puede realizar con Wimu y Qüiko:

(Pincha en las imágenes para ver en tamaño completo)

1. Representación visual de tres jugadores en un campo de Fútbol 7:

1

 

2. Heatmap de uno de los jugadores durante el partido:

3. Análisis espacial de la defensa. Situación de los jugadores (con y sin estela: 1, 2 y 4 jugadores)

2

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Nacsport and RealTrack Systems reach collaboration agreement

nacsport&realtrack

Nacsport and Realtrack Systems collaboration agreement

Nacsport and RealTrack Systems have signed a collaboration agreement. Both companies develop technology applied to improve performance in sports from two different and complementary approaches. They will collaborate in technical and commercial levels.

This agreement will allow both companies to generate a synergy to nurture the technology developed by each other. By doing so, both companies will be able to offer their customers more and better solutions in the field of performance analysis.

Nacsport develops and markets performance analysis solutions. Users are able to make better decisions after getting quality information from using it. The Nacsport suite includes seven video analysis programs and also an iPad app. They have all been created to allow a more detailed analysis for every user, no matter what their level or budget is.

RealTrack Systems provides sport professionals with precise and constant data regarding physical activity, such as acceleration, speed, distance covered or heart rate, among others. These data are monitored through their leading device, Wimu, and shown via Qüiko and Wisee, specific software used to interpret this information.

The products developed by both companies are highly complementary and intended for the same users, that is, athletes and sport professionals who need to get valuable and comprehensive information so they can optimise performance and results.