Título:
|
A low-cost contact system to assess load displacement velocity in a resistance training machine
|
Autor/a:
|
Buscà Safont-Tria, Bernat; Font, Anna
|
Otros autores:
|
Universitat Ramon Llull. Facultat de Psicologia, Ciències de l’Educació i de l’Esport Blanquerna |
Abstract:
|
This study sought to determine the validity of a new system for assessing the displacement and average velocity within machine-based resistance training exercise using the Chronojump System. The new design is based on a contact bar and a simple, low-cost mechanism that detects the conductivity of electrical potentials with a precision chronograph. This system allows coaches to assess velocity to control the strength training process. A validation study was performed by assessing the concentric phase parameters of a leg press exercise. Output time data from the Chronojump System in combination with the preestablished range of movement was compared with data from a position sensor connected to a Biopac System. A subset of 87 actions from 11 professional tennis players was recorded and, using the two methods, average velocity and displacement variables in the same action were compared. A t-test for dependent samples and a correlation analysis were undertaken. The r value derived from the correlation between the Biopac System and the contact Chronojump System was >0.94 for all measures of displacement and velocity on all loads (p < 0.01). The Effect Size (ES) was 0.18 in displacement and 0.14 in velocity and
ranged from 0.09 to 0.31 and from 0.07 to 0.34, respectively. The magnitude of the difference between the two methods in all parameters and the correlation values provided certain evidence of validity of the Chronojump System to assess the average
displacement velocity of loads in a resistance training machine. |
Fecha de creación:
|
22-05-2017 |
Materia(s):
|
Velocitat Entrenament esportiu Tecnologia Chronojump System |
Derechos:
|
L'accés als continguts d'aquest document queda condicionat a l'acceptació de les condicions d'ús establertes per la següent llicència Creative Commons: http://creativecommons.org/licenses/by-nc-nd/4.0/
©Journal of Sports Science and Medicine |
Páginas:
|
9 p. |
Tipo de documento:
|
Artículo |
Editor:
|
Journal of Sports Science and Medicine
|
Publish at:
|
Journal of Sports Science and Medicine, 2011, Núm. 10
|
Compartir:
|
|