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Mechanical Ventilation II: Invasive Ventilation01:23

Mechanical Ventilation II: Invasive Ventilation

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Measurement of Spatial Stability in Precision Grip
09:36

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Published on: June 4, 2020

Forced ventilation increases variability of isometric finger forces.

Sheng Li1, Nobuo Yasuda

  • 1School of Physical Therapy and Rehabilitation Science, The University of Montana, Missoula, Montana 59812, USA. sheng.li@umontana.edu

Neuroscience Letters
|December 13, 2006
PubMed
Summary

Forced breathing patterns significantly increase index finger force variability during submaximal contractions. This suggests ventilation influences motor control, impacting force steadiness.

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Area of Science:

  • Neuromuscular physiology
  • Motor control
  • Respiratory mechanics

Background:

  • Force variability is a key indicator of motor control stability.
  • The influence of respiratory maneuvers on voluntary force production remains incompletely understood.
  • Submaximal contractions are crucial for daily activities and require precise motor adjustments.

Purpose of the Study:

  • To investigate the impact of distinct breathing patterns on index finger force variability.
  • To determine if forced inspiration, forced expiration, or the Valsalva maneuver alter force steadiness compared to normal breathing.
  • To explore the relationship between ventilation patterns and motor output during sustained submaximal contractions.

Main Methods:

  • Fourteen healthy participants performed self-initiated forced inspiration, forced expiration, Valsalva maneuver, and normal breathing.
  • Index finger force was sustained at 15%, 30%, and 45% of maximal voluntary contraction (MVC).
  • Force variability was quantified using standard deviation (S.D.) and coefficient of variation (CV).

Main Results:

  • Force variability (S.D. and CV) increased significantly with higher force levels.
  • Forced inspiration and expiration led to significantly greater force variability than normal breathing or the Valsalva maneuver.
  • Force variability synchronized with the onset of forced inspiration and expiration, but not with other breathing conditions.

Conclusions:

  • Specific ventilation patterns, particularly forced inspiration and expiration, demonstrably increase index finger force variability.
  • Motor control during submaximal contractions is sensitive to respiratory phase and effort.
  • Future assessments of force variability should account for concurrent respiratory influences.