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  • Acute partial paralysis alters perceptions of air, hunger, work and effort at constant PCO2 and Ve.

    Author(s)
    Moosavi, S.H.
    Topulos, G.P.
    Hafer, G.P.
    Lansing, R
    Adams, Lewis
    Brown, R
    Banzett, R.B.
    Griffith University Author(s)
    Adams, Lewis
    Year published
    2000
    Metadata
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    Abstract
    Breathing sensations of AIR HUNGER, WORK and EFFORT may depend on projections of central motor discharge (corollary discharge) to the forebrain. Source of motor drive (brainstem or cortex) may determine what is perceived. To test the effect of changing motor discharge at constant ventilation, we induced partial neuromuscular blockade during hypercapnic hyperpnea (31±9 L min−1; PETCO2=49±2 Torr) and during matched volitional hyperpnea (34±5 L min−1; PETCO2=41±1 Torr). Decline of vital capacity was similar between conditions (39%). Ventilation was unchanged with paralysis, indicating increased respiratory motor drive to maintain ...
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    Breathing sensations of AIR HUNGER, WORK and EFFORT may depend on projections of central motor discharge (corollary discharge) to the forebrain. Source of motor drive (brainstem or cortex) may determine what is perceived. To test the effect of changing motor discharge at constant ventilation, we induced partial neuromuscular blockade during hypercapnic hyperpnea (31±9 L min−1; PETCO2=49±2 Torr) and during matched volitional hyperpnea (34±5 L min−1; PETCO2=41±1 Torr). Decline of vital capacity was similar between conditions (39%). Ventilation was unchanged with paralysis, indicating increased respiratory motor drive to maintain hyperpnea. Sensations were rated on a seven point ordinal scale. Median EFFORT and WORK increased 3–3.5 points with paralysis during both forms of hyperpnea (P<0.02, Wilcoxon signed rank). Median AIR HUNGER increased 2.5 points with paralysis during hypercapnic (P<0.02) but not during volitional hyperpnea. Data suggests that EFFORT and WORK arise from motor cortex activity (subjects reported engaging volitional control when paralyzed even during hypercapnia) and suggests that AIR HUNGER arises from medullary motor activity.
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    Journal Title
    Respiration Physiology
    Volume
    122
    DOI
    https://doi.org/10.1016/S0034-5687(00)00135-3
    Subject
    Cardiovascular medicine and haematology
    Neurosciences
    Medical physiology
    Publication URI
    http://hdl.handle.net/10072/58400
    Collection
    • Journal articles

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