PMID- 24137067
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20131018
LR  - 20211021
IS  - 1303-2968 (Print)
IS  - 1303-2968 (Electronic)
IS  - 1303-2968 (Linking)
VI  - 11
IP  - 1
DP  - 2012
TI  - Reliability and validity of a wireless microelectromechanicals based system 
      (keimove) for measuring vertical jumping performance.
PG  - 115-22
AB  - 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 
      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.
FAU - Requena, Bernardo
AU  - Requena B
AD  - Faculty of Sport, University of Pablo de Olavide , Spain.
FAU - Garcia, Inmaculada
AU  - Garcia I
FAU - Requena, Francisco
AU  - Requena F
FAU - Saez-Saez de Villarreal, Eduardo
AU  - Saez-Saez de Villarreal E
FAU - Paasuke, Mati
AU  - Paasuke M
LA  - eng
PT  - Journal Article
DEP - 20120301
PL  - Turkey
TA  - J Sports Sci Med
JT  - Journal of sports science & medicine
JID - 101174629
PMC - PMC3737853
OTO - NOTNLM
OT  - Counter-movement jump
OT  - microelectromechanical systems
OT  - testing
EDAT- 2012/01/01 00:00
MHDA- 2012/01/01 00:01
PMCR- 2012/03/01
CRDT- 2013/10/19 06:00
PHST- 2011/11/15 00:00 [received]
PHST- 2012/01/20 00:00 [accepted]
PHST- 2013/10/19 06:00 [entrez]
PHST- 2012/01/01 00:00 [pubmed]
PHST- 2012/01/01 00:01 [medline]
PHST- 2012/03/01 00:00 [pmc-release]
AID - jssm-11-115 [pii]
PST - epublish
SO  - J Sports Sci Med. 2012 Mar 1;11(1):115-22. eCollection 2012.