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Related Experiment Video

Updated: Jul 14, 2026

Acquisition and Semi-Automated Analysis of Respiratory Muscle Surface Electromyography

Acquisition and Semi-Automated Analysis of Respiratory Muscle Surface Electromyography

Published on: January 24, 2025

Inspiratory muscle activity during incremental exercise in obese men.

M Chlif¹, D Keochkerian, Y Feki

¹EA 3300 APS and Motor Patterns: Adaptations-Rehabilitation, Faculté des Sciences du Sport, Sport Science Department, Picardie Jules Verne University, Amiens Cedex, France. mehdi.chlif@u-picardie.fr

International Journal of Obesity (2005)

|June 28, 2007

Summary

Obese men exhibit heightened inspiratory muscle activity during exercise due to reduced strength and increased drive, potentially leading to respiratory muscle weakness and decreased exercise capacity. The tension-time index of inspiratory muscles (TT0.1) can help assess these changes.

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Inspiratory Muscle Training as an Adjunct to the Treatment of Weaning Failure in Critically Ill Patients: A Practical Guide

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Area of Science:

Exercise Physiology
Respiratory Medicine
Obesity Research

Background:

Obesity is associated with altered cardiorespiratory function during exercise.
Inspiratory muscle activity during incremental exercise in obese individuals requires further investigation.

Purpose of the Study:

To compare inspiratory muscle activity, assessed by the non-invasive tension-time index of inspiratory muscles (TT0.1), during incremental exercise in obese men and healthy controls.
To investigate the relationship between inspiratory muscle strength, ventilatory drive, and exercise capacity in obesity.

Main Methods:

Seventeen obese men and 14 healthy controls underwent incremental maximal exercise testing.
Measurements included spirometry, breathing patterns, maximal inspiratory pressure (PIMAX), mouth occlusion pressure (P0.1), and calculation of TT0.1.

Main Results:

Obese subjects demonstrated significantly higher P0.1 and P0.1/PIMAX values compared to controls at all exercise intensities.
The TT0.1 was significantly elevated in obese subjects across all workloads and at maximal exercise.
These findings indicate increased ventilatory drive and reduced relative inspiratory muscle strength in obese individuals.

Conclusions:

Obesity is characterized by altered inspiratory muscle activity during exercise, stemming from reduced inspiratory strength and increased ventilatory drive.
These alterations may predispose individuals with obesity to respiratory muscle weakness and reduced exercise capacity.
The TT0.1 serves as a valuable tool for understanding respiratory muscle function and the benefits of endurance training in obese populations.