A new device for measuring lateral abdominal force

Kernc, Dejan (author), Strojnik, Vojko (author), Prevc, Petra (author)

A positive relationship between intra-abdominal pressure (IAP) and activation of m. transversus abdominis (TrA) is well established, enabling the non-invasive prediction of IAP from an EMG TrA signal. Since lateral abdominal force (LAF) may also be related to IAP, a new sensor device for measuring LAF was developed to assess IAP. Sixteen participants performed two progressive isometric shoulder flexions to their maximum to induce IAP. The LAF and surface EMG of the TrA muscle were measured. Lateral abdominal force was analysed for reliability and validity regarding the EMG TrA signal. For each individual, correlation coefficients between the EMG TrA and lateral abdominal force sensor (LAFS) signals were significant and ranged from 0.886 to 0.994. In all cases, the EMG TrA signal made a significant contribution (p < 0.001) when predicting the LAFS signal, while the linear prediction of the LAFS signal yielded a small error of estimation. The interclass correlation confirmed consistency between two repetitions. Results provide that the LAFS might estimate IAP in a simple and non-invasive way. The new device also has the potential to detect the start of the increase in IAP before the action, a principle important for lumbar spine protection.

• Language: English
• Keywords: sport, intra-abdominal pressure, transversus abdominis, lateral abdominal force, validity, reliability
• 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. 157-169
• Numbering: Vol. 31, no. 3
• PID: 20.500.12556/RUL-180552
• UDC: 796.01
• ISSN on article: 1318-2269
• DOI: 10.52165/kinsi.31.3.157-169
• COBISS.SI-ID: 265807875

Copyright

Podatek o licenci CC BY-SA 4.0 je naveden na pristajalni strani članka (glej zgoraj izvorni URL). (Datum opombe: 17. 3. 2026)

• Publication date in RUL: 11.03.2026

Record is a part of a journal

• Title: Kinesiologia Slovenica : scientific journal on sport
• Shortened title: Kinesiol. Slov.
• Publisher: Založba Univerze v Ljubljani
• ISSN: 1318-2269
• COBISS.SI-ID: 30681856

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: Nova naprava za merjenje lateralne abdominalne sile

Abstract

Pozitivna korelacija med znotrajtrebušnim pritiskom (IAP) in aktivacijo mišice transversus abdominis (TrA) omogoča neinvazivno merjenje IAP preko zaznavanja signala EMG TrA. V članku ugotavljamo povezanost med EMG signalom TrA in lateralno abdominalno silo (LAF), merjeno z novo zasnovano napravo, s pomočjo katere bi lahko enostavno ocenili znotrajtrebušni pritisk. Šestnajst merjencev je izvedlo dve največji hoteni izometrični fleksiji ramena s postopnim naraščanjem sile, da bi povečali IAP. Med nalogo sta bili izmerjeni LAF in površinski EMG mišice TrA. Korelacijski koeficient med signalom senzorja za lateralno abdominalno silo (LAFS) in signalom EMG TrA je bil pri posameznih merjencih med 0.886 in 0.994 in je bil pri vseh statistično značilen (p < 0.001), hkrati pa je bila napaka ocene IAP s pomočjo EMG TrA majhna. Medrazredni korelacijski koeficient je potrdil skladnost dveh ponovitev. Raziskava ugotavlja visoko povezanost med EMG TrA in LAFS, s čimer podpira idejo, da je mogoče iz signala LAFS oceniti IAP na enostaven in neinvaziven način. Nova naprava hkrati predstavlja potencialno možnost zaznavanja začetka povečanja IAP že pred akcijo, ki je pomemben varnostni mehanizem lumbalne hrbtenice.

• Keywords: šport, znotrajtrebušni pritisk, prečna trebušna mišica, lateralna abdominalna sila, veljavnost, zanesljivost