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J Appl Physiol (October 11, 2002). doi:10.1152/japplphysiol.00564.2002
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Articles in PresS, published online ahead of print October 11, 2002
J Appl Physiol, 10.1152/jap.00564.2002
Submitted on June 27, 2002
Accepted on October 3, 2002

Magnitude Estimation of Inspiratory Resistive Loads by Double Lung Transplant Recipients

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

1 Department of Physical Therapy, University of Florida, Gainesville, FL, USA
2 Department of Physiological Sciences, University of Florida, Gainesville, FL, USA

* To whom correspondence should be addressed. E-mail: davenportp{at}mail.vetmed.ufl.edu.

The purpose of this study was to investigate the role of afferent input from the lung and lower airways in magnitude estimation of inspiratory resistive loads. In order to assess the role of lung vagal afferents in respiratory sensation, sensations related to inspiratory resistive loads, reflected by subjects' handgrip responses (HG%), were compared between double lung transplant recipients (DLT) with normal lung function and healthy control subjects (NOR). Perceptual sensitivity to the external load was measured as the slope of HG% as a function of peak mouth pressure (Pm), and the slope of HG% as a function of resistive load (R) after a log-log transformation. The results showed that the DLT group had a similar HG% response, as well as the slopes of logHG%-logPm and logHG%-logR, as compared with the NOR group. Furthermore, the ventilatory responses to external loads were also similar between the two groups. These results suggest that lung vagal afferents do not play a significant role in magnitude estimation of inspiratory resistive loads in humans.




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