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J Appl Physiol 93: 1779-1785, 2002. First published August 2, 2002; doi:10.1152/japplphysiol.00210.2002
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Vol. 93, Issue 5, 1779-1785, November 2002

Detection of inspiratory resistive loads in double-lung transplant recipients

Weiying Zhao1, A. Daniel Martin1, and Paul W. Davenport2

1 Departments of Physical Therapy and 2 Physiological Sciences, University of Florida, Gainesville, Florida 32610

The afferent pathways mediating respiratory load perception are still largely unknown. To assess the role of lung vagal afferents in respiratory sensation, detection of inspiratory resistive loads was compared between 10 double-lung transplant (DLT) recipients with normal lung function and 12 healthy control (Nor) subjects. Despite a similar unloaded and loaded breathing pattern, the DLT group had a significantly higher detection threshold (2.91 ± 0.5 vs. 1.55 ± 0.3 cmH2O · l-1 · s) and Weber fraction (0.50 ± 0.1 vs. 0.30 ± 0.1) compared with the Nor group. These results suggest that inspiratory resistive load detection occurs in the absence of vagal afferent feedback from the lung but that lung vagal afferents contribute to inspiratory resistive load detection response in humans. Lung vagal afferents are not essential to the regulation of resting breathing and load compensation responses.

respiratory sensation; load compensation; psychophysics; inspiratory load


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