A model of the respiratory pump

D R Hillman, K E Finucane

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    The interaction of forces that produce chest wall motion and lung volume change is complex and incompletely understood. To aid understanding we have developed a simple model that allows prediction of the effect on chest wall motion of changes in applied forces. The model is a lever system on which the forces generated actively by the respiratory muscles and passively by impedances of rib cage, lungs, abdomen, and diaphragm act at fixed sites. A change in forces results in translational and/or rotational motion of the lever; motion represents volume change. The distribution and magnitude of passive relative to active forces determine the locus and degree of rotation and therefore the effect of an applied force on motion of the chest wall, allowing the interaction of diaphragm, rib cage, and abdomen to be modeled. Analysis of moments allow equations to be derived that express the effect on chest wall motion of the active component in terms of the passive components. These equations may be used to test the model by comparing predicted with empirical behavior. The model is simple, appears valid for a variety of respiratory maneuvers, is useful in interpreting relative motion of rib cage and abdomen and may be useful in quantifying the effective forces acting on the rib cage.

    Original languageEnglish
    Pages (from-to)951-61
    Number of pages11
    JournalJournal of applied physiology (Bethesda, Md. : 1985)
    Volume63
    Issue number3
    DOIs
    Publication statusPublished - Sep 1987

    Fingerprint

    Thoracic Wall
    Abdomen
    Diaphragm
    Lung
    Respiratory Muscles
    Electric Impedance
    Rib Cage

    Cite this

    @article{579047656c1649d89211b81c4f70f0c6,
    title = "A model of the respiratory pump",
    abstract = "The interaction of forces that produce chest wall motion and lung volume change is complex and incompletely understood. To aid understanding we have developed a simple model that allows prediction of the effect on chest wall motion of changes in applied forces. The model is a lever system on which the forces generated actively by the respiratory muscles and passively by impedances of rib cage, lungs, abdomen, and diaphragm act at fixed sites. A change in forces results in translational and/or rotational motion of the lever; motion represents volume change. The distribution and magnitude of passive relative to active forces determine the locus and degree of rotation and therefore the effect of an applied force on motion of the chest wall, allowing the interaction of diaphragm, rib cage, and abdomen to be modeled. Analysis of moments allow equations to be derived that express the effect on chest wall motion of the active component in terms of the passive components. These equations may be used to test the model by comparing predicted with empirical behavior. The model is simple, appears valid for a variety of respiratory maneuvers, is useful in interpreting relative motion of rib cage and abdomen and may be useful in quantifying the effective forces acting on the rib cage.",
    keywords = "Animals, Diaphragm/physiology, Humans, Lung/physiology, Mathematics, Models, Biological, Muscle Contraction, Respiration, Ribs/physiology, Thorax/physiology",
    author = "Hillman, {D R} and Finucane, {K E}",
    year = "1987",
    month = "9",
    doi = "10.1152/jappl.1987.63.3.951",
    language = "English",
    volume = "63",
    pages = "951--61",
    journal = "Journal of applied physiology (Bethesda, Md. : 1985)",
    issn = "1522-1601",
    publisher = "American Physiological Society",
    number = "3",

    }

    A model of the respiratory pump. / Hillman, D R; Finucane, K E.

    In: Journal of applied physiology (Bethesda, Md. : 1985), Vol. 63, No. 3, 09.1987, p. 951-61.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - A model of the respiratory pump

    AU - Hillman, D R

    AU - Finucane, K E

    PY - 1987/9

    Y1 - 1987/9

    N2 - The interaction of forces that produce chest wall motion and lung volume change is complex and incompletely understood. To aid understanding we have developed a simple model that allows prediction of the effect on chest wall motion of changes in applied forces. The model is a lever system on which the forces generated actively by the respiratory muscles and passively by impedances of rib cage, lungs, abdomen, and diaphragm act at fixed sites. A change in forces results in translational and/or rotational motion of the lever; motion represents volume change. The distribution and magnitude of passive relative to active forces determine the locus and degree of rotation and therefore the effect of an applied force on motion of the chest wall, allowing the interaction of diaphragm, rib cage, and abdomen to be modeled. Analysis of moments allow equations to be derived that express the effect on chest wall motion of the active component in terms of the passive components. These equations may be used to test the model by comparing predicted with empirical behavior. The model is simple, appears valid for a variety of respiratory maneuvers, is useful in interpreting relative motion of rib cage and abdomen and may be useful in quantifying the effective forces acting on the rib cage.

    AB - The interaction of forces that produce chest wall motion and lung volume change is complex and incompletely understood. To aid understanding we have developed a simple model that allows prediction of the effect on chest wall motion of changes in applied forces. The model is a lever system on which the forces generated actively by the respiratory muscles and passively by impedances of rib cage, lungs, abdomen, and diaphragm act at fixed sites. A change in forces results in translational and/or rotational motion of the lever; motion represents volume change. The distribution and magnitude of passive relative to active forces determine the locus and degree of rotation and therefore the effect of an applied force on motion of the chest wall, allowing the interaction of diaphragm, rib cage, and abdomen to be modeled. Analysis of moments allow equations to be derived that express the effect on chest wall motion of the active component in terms of the passive components. These equations may be used to test the model by comparing predicted with empirical behavior. The model is simple, appears valid for a variety of respiratory maneuvers, is useful in interpreting relative motion of rib cage and abdomen and may be useful in quantifying the effective forces acting on the rib cage.

    KW - Animals

    KW - Diaphragm/physiology

    KW - Humans

    KW - Lung/physiology

    KW - Mathematics

    KW - Models, Biological

    KW - Muscle Contraction

    KW - Respiration

    KW - Ribs/physiology

    KW - Thorax/physiology

    U2 - 10.1152/jappl.1987.63.3.951

    DO - 10.1152/jappl.1987.63.3.951

    M3 - Article

    VL - 63

    SP - 951

    EP - 961

    JO - Journal of applied physiology (Bethesda, Md. : 1985)

    JF - Journal of applied physiology (Bethesda, Md. : 1985)

    SN - 1522-1601

    IS - 3

    ER -