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How to measure gymnast upper body relative strength on still rings with a pair of strain gauges
ID Lecocq, Tom (Author), ID Gouelle, Arnaud (Author), ID Tordi, Nicolas (Author)

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Abstract
Over the last few decades, the development of the Code of Points, which defines the values for each gymnastic skill as well as possible errors, has brought with it the ubiquitous need for strength and hold elements (Group II) and Swing to strength hold elements (Group III) in order to be competitive on the still rings. This apparatus will be crucial in the upcoming Olympic cycle, therefor it's important to keep a close eye on gymnasts’ progress. Despite being the gold standard, force plates are a costly and unwieldy piece of equipment for a federation interested in measuring strength. The purpose of this article is to determine how accurately the vertical component of the force produced by the gymnast (vForce) can be estimated using two strain gauges placed in the cables. 16 recreational gymnasts (32±11 years old, 74±7 kg, 173±6 cm) performed one maximal isometric contraction in the iron cross position. The tension in the cables were measured with a pair of strain gauges, while the vertical ground reaction force (vGRF) was recorded synchronously with a pair of force plates placed under the gymnast. The residuals of the tension are strongly correlated with the cable angle (R = 0.84), while the calculated vForce is completely uncorrelated with the cable angle (R = -0.09) and has a smaller systematic and random error (Bias ± LOA Range: -4.8N ± 13.3N). Strain gauges are valid instruments for measuring and monitoring the relative upper body force of gymnasts, provided that the cable angle is known and does not change during contraction.

Language:English
Keywords:sport, physical education, force plates, artistic gymnastics, evaluation, tool, asymmetry, gymnastics
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FŠ - Faculty of Sport
Publication status:Published
Publication version:Version of Record
Year:2025
Number of pages:Str. 233-241, 345
Numbering:Vol. 17, iss. 2
PID:20.500.12556/RUL-183710 This link opens in a new window
UDC:796.41
ISSN on article:1855-7171
DOI:10.52165/sgj.17.2.233-241 This link opens in a new window
COBISS.SI-ID:260480003 This link opens in a new window
Copyright:
Podatek o licenci CC BY-SA 4.0 je naveden na pristajalni strani članka (glej zgoraj izvorni URL). (Datum opombe: 19. 6. 2026)
Publication date in RUL:19.06.2026
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Record is a part of a journal

Title:Science of gymnastics journal
Publisher:University of Ljubljana Press, Slovenia (Založba Univerze v Ljubljani)
ISSN:1855-7171
COBISS.SI-ID:246418176 This link opens in a new window

Licences

License:CC BY-SA 4.0, Creative Commons Attribution-ShareAlike 4.0 International
Link:http://creativecommons.org/licenses/by-sa/4.0/
Description:This Creative Commons license is very similar to the regular Attribution license, but requires the release of all derivative works under this same license.

Secondary language

Language:Slovenian
Title:Kako izmeriti sorazmerno silo zgornjega dela telesa telovadca na krogih s parom merilnikov napetosti
Abstract:
V zadnjih nekaj desetletjih je razvoj Pravilnika ocenjevanja, ki opredeljuje vrednosti za vsako telovadno prvino in morebitne napake, prinesel s seboj vseprisotno potrebo po izvedbi prvin moči in drž (skupina II) ter kolebnih prvinah s prehodom v držo (skupina III) na krogih. To orodje ima velik pomen v prihajajočem olimpijskem obdobju, zato je pomembno pozorno spremljati napredek telovadcev. Kljub temu, da so zlati standard, so pritiskovne plošče drag in neroden kos opreme za merjenje sile. Namen tega članka je ugotoviti, kako natančno je mogoče oceniti navpični del sile, ki jo ustvari telovadec (vForce), z uporabo dveh merilnikov napetosti, nameščenih v jeklenice. 16 telovadcev srednjega razreda kakovosti (32 ± 11 let, 74 ± 7 kg, 173 ± 6 cm) je izvedlo eno največjo izometrično kontrakcijo v položaju razpore. Napetost v kablih je bila izmerjena z dvema merilnikoma napetosti, medtem ko je bila navpična sila reakcije tal (vGRF) sinhrono zabeležena s parom pritiskovnih plošč, nameščenih pod telovadcem. Preostanki napetosti so močno povezani s kotom kabla (R = 0,84), medtem ko izračunana sila vForce ni v povezavi s kotom kabla (R = -0,09) in ima manjšo sistematično in naključno napako (območje Bias ± LOA: -4,8 N ± 13,3 N). Merilniki napetosti so veljavna merska oprema za merjenje in spremljanje sorazmerne sile zgornjega dela telesa telovadcev, pod pogojem, da je kot jeklenice znan in se med držo ne spreminja.

Keywords:šport, gimnastika, telovadba, telesna vzgoja, pritiskovne plošče, orodna telovadba, ovrednotenje, orodje, nesomernost

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