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3D Ultrasound Imaging: Fast and Cost-effective Morphometry of Musculoskeletal Tissue
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Optimizing normalization methods of the external oblique: A cross-sectional study.

Luk Devorski1,2, Andrew Skibski1,2, David H Fukuda2,3

  • 1Rehabilitation, Athletic Assessment & Dynamic Imaging (READY) Laboratory, Institute of Exercise Physiology and Rehabilitation Science, University of Central Florida, Orlando, FL, USA.

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Summary

The side-lying table technique is a better method for determining maximum voluntary isometric contraction (MVIC) for core exercises than the Roman chair technique. This ensures accurate %MVIC values for clinical use.

Keywords:
Core stabilityisometric contractionsurface electromyography

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Area of Science:

  • Biomechanics
  • Exercise Physiology
  • Rehabilitation Science

Background:

  • Establishing reliable maximum voluntary isometric contraction (MVIC) normalization is crucial for comparing core exercise intensity (%MVIC).
  • Accurate %MVIC values guide preventative and rehabilitative exercise interventions.

Purpose of the Study:

  • To compare the external oblique's %MVIC between side-lying lateral trunk flexion and Roman chair lateral trunk flexion normalization techniques.
  • To identify the optimal MVIC normalization method for core exercise assessment.

Main Methods:

  • Twenty-two participants performed two MVIC normalization techniques followed by five core exercises.
  • Analysis included average %MVIC during the first 5 seconds, last 5 seconds, and overall duration.
  • ANOVA compared normalized %MVIC across exercises and MVIC techniques (p=0.05).

Main Results:

  • The side-lying table technique produced %MVIC values consistently below 100%, unlike the Roman chair technique.
  • A significant difference (p<0.001) was observed in the last 5 seconds of the torso elevated side plank between techniques (57.87 ± 38.51%MVIC).

Conclusions:

  • The side-lying table technique appears to be the optimal method for determining %MVIC.
  • This finding supports more accurate assessment and prescription of core strengthening exercises.