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Respiratory dynamics during laughter.

M Filippelli1, R Pellegrino, I Iandelli

  • 1Fondazione Don C. Gnocchi ONLUS, UOF di Riabilitazione Respiratoria, Centro di S. Maria agli Ulivi, 50020 Pozzolatico, Firenze, Italy.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|March 15, 2001
PubMed
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Fits of laughter significantly decrease lung volumes across all chest compartments, causing airway compression. The diaphragm actively protects thoracic organs from increased abdominal pressure during these expiratory efforts.

Area of Science:

  • Respiratory Physiology
  • Biomechanics

Background:

  • Laughter involves complex respiratory muscle activity.
  • Understanding lung and chest wall mechanics during laughter is crucial for respiratory health.

Purpose of the Study:

  • To investigate lung and chest wall mechanics during natural laughter.
  • To quantify changes in respiratory compartment volumes and pressures during laughter.

Main Methods:

  • Utilized 3D optoelectronic plethysmography to measure chest wall volume changes in 11 subjects.
  • Partitioned chest wall volume into upper thorax, lower thorax, and abdominal compartments.
  • Measured esophageal (Pes) and gastric (Pga) pressures in 7 subjects.

Main Results:

  • Laughter induced rapid, repetitive expiratory efforts (4.6 Hz), reducing functional residual capacity (FRC) by 1.55 L.

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  • All chest compartments contributed equally to lung volume decrease.
  • Significant increases in Pes and Pga were observed, indicating dynamic airway compression.

    • Conclusions:

    • Fits of laughter cause substantial, consistent decreases in lung volume and dynamic airway compression.
    • The diaphragm plays a protective role by limiting the transmission of increased abdominal pressure to the chest cavity.