ORIEMS FIT Research Digest

Introduction – Why We Publish Research Summaries

Welcome to the ORIEMS FIT Research Digest.

Our mission is simple:

We take real university research.
We translate it into clear, everyday language.
We remove the confusion.
We remove the hype.

This article is for educational purposes only.
It is not medical advice.
It does not replace professional care.

Today we examine a 2018 study that asked a very practical question:

Does abdominal electrical stimulation activate the muscles strongly enough to create meaningful expiratory pressure?

What Is This Study About?

Study Title

Optimal electrode position for abdominal functional electrical stimulation

Study by

McCaughey EJ, Boswell-Ruys CL, Hudson AL, Gandevia SC, Butler JE

Published in

Journal of Applied Physiology, 2018

DOI

10.1152/japplphysiol.00446.2018

Original article: https://journals.physiology.org/doi/pdf/10.1152/japplphysiol.00446.2018

Who Conducted the Study?

Researchers from:

• Neuroscience Research Australia

• University of New South Wales

• Prince of Wales Hospital

• Sydney, Australia

What Type of Electrical Stimulation Was Used?

The study examined:

Abdominal Functional Electrical Stimulation (FES)

Important clarification:

• EMS / NMES = stimulates muscles to contract

• FES = EMS used to assist a specific function (here, breathing)

• TENS = mainly targets sensory nerves for pain modulation

This study used FES to activate abdominal muscles involved in breathing out.

Why Does Expiratory Pressure Matter?

Expiratory pressure is the force generated when you breathe out forcefully.

It is important for:

• Coughing

• Clearing mucus

• Supporting airway function

People with weak abdominal muscles may struggle to generate strong cough force.

This study measured whether electrical stimulation could produce measurable expiratory pressure.

How Did They Study It?

Participants

• 10 healthy adults

• 9 male

• Age range: 24–63 years

• Average age: 36.9 years

No respiratory disease. No spinal cord injury.

Study Design

• Within-subject experimental design

• Each participant tested 3 different electrode placements

• Single stimulation pulses

• Measured immediate pressure response

• No long-term training program

What Did They Measure?

They inserted pressure sensors to measure:

• Gastric pressure (Pga) → abdominal pressure

• Esophageal pressure (Pes) → thoracic pressure

These pressures reflect the strength of expiratory muscle contraction.

Higher pressure = stronger contraction.

The Three Electrode Positions Tested

1. Posterolateral abdominal wall (side/back region)

2. Over motor points of external oblique + rectus abdominis

3. Over motor points of external oblique only

Stimulation details:

• 200 microsecond pulse width

• Current gradually increased

• Up to 450 mA or tolerance

• Tested at normal breathing level and full inhalation

What Did They Find?

Key Finding

Yes — abdominal electrical stimulation produced measurable expiratory pressure.

But electrode placement mattered greatly.

At 450 mA:

Posterolateral placement produced:

• 71–95% higher abdominal pressure

• 53–56% higher thoracic pressure

These differences were statistically significant (P < 0.001).

Additional Findings

• Adding rectus abdominis did not increase pressure.

• Lung volume influenced pressure.

• No muscle fatigue observed during testing.

What Does This Mean?

For Someone Considering EMS

This study shows:

• Electrical stimulation can activate abdominal expiratory muscles.

• The contraction is measurable.

• Placement significantly affects strength of activation.

However:

• This was an acute laboratory test.

• It did not measure long-term strength gains.

• It did not measure disease outcomes.

• It did not test clinical cough improvement.

Realistic expectations are important.

EMS activates muscle through motor nerve stimulation.
It does not replace normal breathing.
It does not guarantee clinical outcomes.

For Someone Already Using EMS

This study suggests:

• Proper electrode placement matters.

• Side/back placement may activate deeper abdominal muscles more effectively.

• Consistency and correct positioning influence outcomes.

It also reinforces that:

EMS works by activating motor nerves to create contraction.
It is not the same as TENS.

Conclusion

This 2018 study showed that:

Abdominal electrical stimulation can generate meaningful expiratory muscle contraction.

The strongest pressures were observed when electrodes were placed posterolaterally on the abdominal wall.

The study does not claim therapeutic effects.
It provides physiological evidence of muscle activation.

We encourage informed decision-making and reading the full research article for context.

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🔴 DISCLAIMER

This article is for educational purposes only.

It does not provide:

• Medical advice

• Diagnosis

• Treatment recommendations

• Therapeutic claims

The research discussed reflects findings in healthy adults under laboratory conditions.

ORIEMS FIT does not:

• Claim to cure, prevent, or treat any disease

• Guarantee respiratory improvement

• Guarantee cough enhancement

• Promise clinical outcomes

Individual responses vary.

Consult a qualified health professional before using any electrical stimulation device, especially if you have:

• Respiratory conditions

• Neurological conditions

• Cardiac implants

• Recent surgery

• Pregnancy

This content complies with Australian TGA advertising guidelines.

ORIEMS FIT is not affiliated with the research institutions mentioned.

No endorsement is implied.

Readers are responsible for their own health decisions.

ORIEMS FIT accepts no liability for misuse of products or interpretation of this content.

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