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Hyperpnea and Hyperventilation01:25

Hyperpnea and Hyperventilation

Hyperventilation refers to a higher-than-normal rate and depth of breathing, often associated with anxiety attacks. This excessive breathing surpasses the body's need to expel CO2, leading to a condition known as hypocapnia - an unusually low level of carbon dioxide in the blood. Hypocapnia can constrict cerebral blood vessels, reducing blood flow to the brain, which may result in dizziness or fainting. Early signs include tingling and muscle spasms in the hands and face, caused by falling...
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Effects of self-contained breathing apparatus on ventricular function during strenuous exercise.

Michael D Nelson1, Mark J Haykowsky, Jonathan R Mayne

  • 1University of Alberta, E4-77 Van Vliet Centre,Edmonton, AB, Canada T6G 2H9. mdn1@ualberta.ca

Journal of Applied Physiology (Bethesda, Md. : 1985)
|November 15, 2008
PubMed
Summary

Strenuous exercise with self-contained breathing apparatus (SCBA) reduces left-ventricular (LV) filling and stroke volume. Increased intrathoracic pressure from SCBA compromises venous return, limiting stroke area during exercise and heat stress.

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Area of Science:

  • Cardiovascular Physiology
  • Exercise Physiology
  • Respiratory Physiology

Background:

  • Firefighters and other professionals often use self-contained breathing apparatus (SCBA) during strenuous activity.
  • Understanding the impact of SCBA on cardiovascular function is crucial for occupational safety.
  • Previous research suggests increased intrathoracic pressure can affect cardiac function.

Purpose of the Study:

  • To investigate left-ventricular (LV) function during strenuous exercise while using an SCBA.
  • To compare LV function under SCBA conditions versus a low-resistance breathing valve.
  • To determine the effects of SCBA use on cardiac output and related parameters during exercise.

Main Methods:

  • Twenty healthy men performed sustained exercise (3 x 10 min) wearing fire protective equipment.
  • Two breathing conditions were tested: SCBA and a low-resistance breathing valve.
  • Two-dimensional echocardiography, esophageal pressure, and physiological variables were measured.

Main Results:

  • SCBA use led to higher peak expiratory esophageal pressure.
  • End-diastolic cavity area (EDCA) and stroke area (SA) were significantly lower with SCBA.
  • Despite reduced preload (EDCA), LV end-systolic cavity area (ESCA) and contractility remained similar, but SA could not be maintained under SCBA conditions.

Conclusions:

  • Increased intrathoracic pressure from SCBA reduces LV preload (EDCA).
  • During strenuous exercise with heat stress, SCBA use compromises venous return, limiting the ability to maintain stroke area (SA).
  • These findings highlight potential cardiovascular strain associated with SCBA use in demanding occupational settings.