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Muscle Function Obtained with Motion Mode Ultrasound and Surface Electromyography during Core Endurance Exercise

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Transversus abdominis: changes in thickness during an incremental upper limb exercise test.

Maureen P McEvoy¹, Adrian J Cowling, Ian J Fulton

¹School of Health Sciences, University of South Australia, Adelaide, South Australia, Australia. maureen.mcevoy@unisa.edu.au

Physiotherapy Theory and Practice

|June 25, 2008

Summary

This summary is machine-generated.

This study measured the transversus abdominis (TrA) muscle activity during an upper limb exercise test. Results show continuous TrA activation increases, particularly during high postural and breathing demands.

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Area of Science:

Kinesiology
Physiology
Rehabilitation Science

Background:

The transversus abdominis (TrA) plays a crucial role in core stability and postural control.
Understanding TrA activation patterns during dynamic tasks is essential for rehabilitation and performance enhancement.

Purpose of the Study:

To quantify TrA muscle thickness changes during an incremental fatiguing upper limb exercise test (UULEX) in healthy young adults.
To investigate the relationship between TrA activity and postural/ventilatory demands during prolonged upper limb tasks.

Main Methods:

Real-time ultrasound imaging was used to measure TrA thickness in 26 healthy participants (18-25 years) during a 12-minute UULEX.
Test-retest reliability of TrA thickness measurements during the UULEX was assessed.
Mixed-model analysis examined changes in TrA thickness over time.

Main Results:

TrA thickness significantly increased throughout the UULEX (p < 0.05).
Significant increases in TrA thickness were observed at minutes 10, 11, and 12 compared to baseline.
The observed increases in TrA thickness correlated with periods of heightened postural and ventilatory challenge.

Conclusions:

The transversus abdominis demonstrates continuous and escalating activation during a 12-minute incremental upper limb exercise test in healthy young adults.
These findings suggest TrA's role in managing increasing postural and respiratory demands during fatiguing upper limb activities.
The results may inform interventions for individuals with musculoskeletal or respiratory conditions who experience difficulties with upper limb tasks.