Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
from September 2014
©Journal of Sports Science and Medicine (2012) 11, 115 - 122

Research article
Reliability and Validity of a Wireless Microelectromechanicals Based System (Keimove™) for Measuring Vertical Jumping Performance
Bernardo Requena1, , Inmaculada García1, Francisco Requena2, Eduardo Saez-Saez de Villarreal1, Mati Pääsuke3
Author Information
1 Faculty of Sport, University of Pablo de Olavide, Spain
2 Department of Orthopaedics and Traumatology, University of Granada, Spain
3 Institute of Exercise Biology and Physiotherapy, University of Tartu, Estonia

Bernardo Requena
✉ Faculty of Sport, University of Pablo de Olavide, Ctra. de Utrera s/n, Sevilla, Spain
Publish Date
Received: 15-11-2011
Accepted: 20-01-2012
Published (online): 01-03-2012
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The aim of this study was to determine the validity and reliability of a microelectromechanicals (MEMs) based system (Keimove™) in measuring flight time and takeoff velocity during a counter-movement jump (CMJ). As criterion reference, data of a high- speed camera (HSC) and a force-platform (FP) synchronized with a linear position transducer (LPT) was used. Thirty professional soccer players completely familiarized with the CMJ technique performed three CMJs. The second and third trials were used for further analysis. The Keimove™ system, the HSC and the FP synchronized with the LPT (FP+LPT) simultaneously measured the CMJ performance. During each repetition, the Keimove™ system registered flight time and velocity at takeoff. At the same time and as criterion reference, both the HSC and the FP recorded the flight time while the LPT+FP registered the velocity at takeoff. Pearson correlation coefficients for the flight time were high (r = 0.99; p < 0.001) when Keimove™ system was compared with the HSC or the FP+LPT, respectively. For the velocity at takeoff variable, the Pearson r between the Keimove™ system and the FP+LPT was lower although significant at the 0.05 level. No significant differences in mean values were observed for flight times and velocity at takeoff between the three devices. Intraclass correlations and coefficients of variation between trials were similar and ranged between 0.92-0.97 and 2.1-7.4, respectively. In conclusion, the Keimove™ system represents a valid and reliable instrument to measure velocity at takeoff and flight time during CMJ testing. Thus, this MEMs-based system will offer a portable, cost-effective tool for the assessment CMJ performance.

Key words: Counter-movement jump, microelectromechanical systems, testing

           Key Points
  • The Keimove™ system is composed of specific software and a wireless MEMs-based device designed to be attached at the lumbar region of the athlete.
  • The Keimove™ system is a mechanically valid and reliable instrument in measuring flight time and velocity at takeoff during CMJ.
  • The validity of the Keimove™ system was determined by comparing its mean flight time and velocity at takeoff with data obtained simultaneously with both a high-speed camera and a force platform synchronized with a linear position transducer.
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