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
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©Journal of Sports Science and Medicine ( 2015 ) 14 , 128 - 136

Research article
Reliability and Validity Assessment of a Linear Position Transducer
Manuel V. Garnacho-Castaño1, , Silvia López-Lastra2, José L. Maté-Muñoz3
Author Information
1 Department of Physiology and Immunology, University of Barcelona, Spain
2 Department of Immunology, Institut Pasteur, Paris, France
3 Department of Physical Activity and Sport Sciences, Universidad Alfonso X el Sabio, Madrid, Spain

Manuel V. Garnacho-Castaño
✉ Department of Physiology and Immunology, University of Barcelona, Avda, Diagonal 643, Barcelona, Spain
Email: mavigarcas@gmail.com
Publish Date
Received: 24-06-2014
Accepted: 18-11-2014
Published (online): 01-03-2015
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ABSTRACT

The objectives of the study were to determine the validity and reliability of peak velocity (PV), average velocity (AV), peak power (PP) and average power (AP) measurements were made using a linear position transducer. Validity was assessed by comparing measurements simultaneously obtained using the Tendo Weightlifting Analyzer Systemi and T-Force Dynamic Measurement Systemr (Ergotech, Murcia, Spain) during two resistance exercises, bench press (BP) and full back squat (BS), performed by 71 trained male subjects. For the reliability study, a further 32 men completed both lifts using the Tendo Weightlifting Analyzer Systemz in two identical testing sessions one week apart (session 1 vs. session 2). Intraclass correlation coefficients (ICCs) indicating the validity of the Tendo Weightlifting Analyzer Systemi were high, with values ranging from 0.853 to 0.989. Systematic biases and random errors were low to moderate for almost all variables, being higher in the case of PP (bias ±157.56 W; error ±131.84 W). Proportional biases were identified for almost all variables. Test-retest reliability was strong with ICCs ranging from 0.922 to 0.988. Reliability results also showed minimal systematic biases and random errors, which were only significant for PP (bias -19.19 W; error ±67.57 W). Only PV recorded in the BS showed no significant proportional bias. The Tendo Weightlifting Analyzer Systemi emerged as a reliable system for measuring movement velocity and estimating power in resistance exercises. The low biases and random errors observed here (mainly AV, AP) make this device a useful tool for monitoring resistance training.

Key words: Back squat, bench press, concentric phase, weight training exercises


           Key Points
  • This study determined the validity and reliability of peak velocity, average velocity, peak power and average power measurements made using a linear position transducer
  • The Tendo Weight-lifting Analyzer System® emerged as a reliable system for measuring movement velocity and power.
 
 
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