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Validity of a low-cost friction encoder for measuring velocity, force and power in flywheel exercise devices

The purpose of this study was to investigate the validity of a low-cost friction encoder against a criterion measure (strain gauge combined with a linear encoder) for assessing velocity, force and power in flywheel exercise devices. Ten young and physically active volunteers performed two sets of 14...

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Autores principales: Illera-Domínguez, Víctor, Fernández-Valdés, Bruno, Gisbert-Orozco, Jose, Ramirez-Lopez, Carlos, Nuell, Sergi, González, Jacob, Weakley, Jonathon
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Institute of Sport in Warsaw 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10286625/
https://www.ncbi.nlm.nih.gov/pubmed/37398963
http://dx.doi.org/10.5114/biolsport.2023.119991
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author Illera-Domínguez, Víctor
Fernández-Valdés, Bruno
Gisbert-Orozco, Jose
Ramirez-Lopez, Carlos
Nuell, Sergi
González, Jacob
Weakley, Jonathon
author_facet Illera-Domínguez, Víctor
Fernández-Valdés, Bruno
Gisbert-Orozco, Jose
Ramirez-Lopez, Carlos
Nuell, Sergi
González, Jacob
Weakley, Jonathon
author_sort Illera-Domínguez, Víctor
collection PubMed
description The purpose of this study was to investigate the validity of a low-cost friction encoder against a criterion measure (strain gauge combined with a linear encoder) for assessing velocity, force and power in flywheel exercise devices. Ten young and physically active volunteers performed two sets of 14 maximal squats on a flywheel inertial device (YoYo Technology, Stockholm, Sweden) with five minutes rest between each set. Two different resistances were used (0.075 kg · m(2) for the first set; 0.025 kg · m(2) for the second). Mean velocity (V(rep)), force (F(rep)) and power (P(rep)) for each repetition were assessed simultaneously via a friction encoder (Chronojump, Barcelona, Spain), and with a strain gauge combined with a linear encoder (MuscleLab 6000, Ergotest Technology, Porsgrunn, Norway). Results are displayed as (Mean [CI 90%]). Compared to criterion measures, mean bias for the practical measures of V(rep), F(rep) and P(rep) were moderate (-0.95 [-0.99 to -0.92]), small (0.53 [0.50 to 0.56]) and moderate (-0.68 [-0.71 to -0.65]) respectively. The typical error of estimate (TEE) was small for all three parameters; V(rep) (0.23 [0.20 to 0.25]), F(rep) (0.20 [0.18 to 0.22]) and P(rep) (0.18 [0.16 to 0.20]). Correlations with MuscleLab were nearly perfect for all measures in all load configurations. Based on these findings, the friction encoder provides valid measures of velocity, force and power in flywheel exercise devices. However, as error did exist between measures, the same testing protocol should be used when assessing changes in these parameters over time, or when aiming to perform inter-individual comparisons.
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spelling pubmed-102866252023-07-01 Validity of a low-cost friction encoder for measuring velocity, force and power in flywheel exercise devices Illera-Domínguez, Víctor Fernández-Valdés, Bruno Gisbert-Orozco, Jose Ramirez-Lopez, Carlos Nuell, Sergi González, Jacob Weakley, Jonathon Biol Sport Original Paper The purpose of this study was to investigate the validity of a low-cost friction encoder against a criterion measure (strain gauge combined with a linear encoder) for assessing velocity, force and power in flywheel exercise devices. Ten young and physically active volunteers performed two sets of 14 maximal squats on a flywheel inertial device (YoYo Technology, Stockholm, Sweden) with five minutes rest between each set. Two different resistances were used (0.075 kg · m(2) for the first set; 0.025 kg · m(2) for the second). Mean velocity (V(rep)), force (F(rep)) and power (P(rep)) for each repetition were assessed simultaneously via a friction encoder (Chronojump, Barcelona, Spain), and with a strain gauge combined with a linear encoder (MuscleLab 6000, Ergotest Technology, Porsgrunn, Norway). Results are displayed as (Mean [CI 90%]). Compared to criterion measures, mean bias for the practical measures of V(rep), F(rep) and P(rep) were moderate (-0.95 [-0.99 to -0.92]), small (0.53 [0.50 to 0.56]) and moderate (-0.68 [-0.71 to -0.65]) respectively. The typical error of estimate (TEE) was small for all three parameters; V(rep) (0.23 [0.20 to 0.25]), F(rep) (0.20 [0.18 to 0.22]) and P(rep) (0.18 [0.16 to 0.20]). Correlations with MuscleLab were nearly perfect for all measures in all load configurations. Based on these findings, the friction encoder provides valid measures of velocity, force and power in flywheel exercise devices. However, as error did exist between measures, the same testing protocol should be used when assessing changes in these parameters over time, or when aiming to perform inter-individual comparisons. Institute of Sport in Warsaw 2022-11-18 2023-07 /pmc/articles/PMC10286625/ /pubmed/37398963 http://dx.doi.org/10.5114/biolsport.2023.119991 Text en Copyright © Biology of Sport 2023 https://creativecommons.org/licenses/by-sa/4.0/This is an Open Access article distributed under the terms of the Creative Commons Attribution Share Alike 4.0 License, allowing third parties to copy and redistribute the material in any medium or format and remix, transform, and build upon the material for any purpose, even commercially, provided the original work is properly cited and states its license.
spellingShingle Original Paper
Illera-Domínguez, Víctor
Fernández-Valdés, Bruno
Gisbert-Orozco, Jose
Ramirez-Lopez, Carlos
Nuell, Sergi
González, Jacob
Weakley, Jonathon
Validity of a low-cost friction encoder for measuring velocity, force and power in flywheel exercise devices
title Validity of a low-cost friction encoder for measuring velocity, force and power in flywheel exercise devices
title_full Validity of a low-cost friction encoder for measuring velocity, force and power in flywheel exercise devices
title_fullStr Validity of a low-cost friction encoder for measuring velocity, force and power in flywheel exercise devices
title_full_unstemmed Validity of a low-cost friction encoder for measuring velocity, force and power in flywheel exercise devices
title_short Validity of a low-cost friction encoder for measuring velocity, force and power in flywheel exercise devices
title_sort validity of a low-cost friction encoder for measuring velocity, force and power in flywheel exercise devices
topic Original Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10286625/
https://www.ncbi.nlm.nih.gov/pubmed/37398963
http://dx.doi.org/10.5114/biolsport.2023.119991
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