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Respiratory and limb muscle function in lung allograft recipients
J G Pantoja1, F H Andrade, D S Stoki
1Department of Medicine, Division of Restorative Neurology, Baylor College of Medicine, Houston, Texas, USA.
American Journal of Respiratory and Critical Care Medicine
|October 6, 1999
Summary
Lung transplant recipients often have reduced exercise capacity due to skeletal muscle weakness. This study found significant expiratory muscle and lower limb muscle deficits in stable lung allograft recipients, contributing to exercise intolerance.
Area of Science:
- Pulmonary Medicine
- Exercise Physiology
- Transplantation Science
Background:
- Lung transplantation recipients frequently exhibit diminished exercise capacity, even with normal resting cardiopulmonary function.
- Skeletal muscle contractile dysfunction is a potential, yet understudied, cause of exercise limitation post-lung transplant.
Purpose of the Study:
- To investigate limb and respiratory muscle function in stable lung allograft recipients with reduced exercise capacity.
- To compare muscle function in lung transplant recipients against age- and sex-matched healthy controls.
Main Methods:
- Assessed respiratory muscle strength via maximal inspiratory and expiratory pressures (MIP and MEP).
- Measured ankle dorsiflexor strength using maximal voluntary contraction (MVC).
- Evaluated tibialis anterior muscle contractile properties and fatigue resistance through electrical stimulation in a subset of patients.
Main Results:
- Lung transplant recipients showed normal maximal inspiratory pressure (MIP) but a 30% reduction in maximal expiratory pressure (MEP) compared to controls.
- Ankle dorsiflexor maximal voluntary contraction (MVC) was significantly decreased by 39% in recipients.
- Tibialis anterior muscle force-frequency relationships and fatigue characteristics were comparable between recipients and controls.
Conclusions:
- Stable lung allograft recipients experience significant expiratory muscle weakness and lower limb muscle weakness.
- These muscle deficits likely contribute to the reduced exercise capacity observed in this patient population.
- Targeting muscle rehabilitation may be crucial for improving functional outcomes after lung transplantation.