Rationale: Lumacaftor/ivacaftor (LUM/IVA) modestly improves lung function following 1 month of treatment but it is unknown if this translates into improvements in exercise endurance and exertional symptoms. Methods: Adult CF participants completed a symptom-limited constant load cycling test with simultaneous assessments of dyspnea and leg discomfort ratings pre- A nd 1 month post-initiation of LUM/IVA. Results: Endurance time, exertional dyspnea and leg discomfort ratings at submaximal exercise did not change significantly. There was a significant inverse correlation between changes in leg discomfort and endurance time (r =-0.88; p = 0.009) following 1-month of LUM/IVA. Conclusions: Overall, 1-month of LUM/IVA did not increase endurance time or modify exertional dyspnea or leg discomfort ratings. However, individuals who experienced a reduction in leg discomfort following LUM/IVA had an improvement in endurance time. Future studies with a larger sample size are needed to verify these findings and to assess the long-term effects of LUM/IVA on exercise outcomes. Trial registration: ClinicalTrials.gov Identifier: NCT02821130. Registered July 1, 2016.
CITATION STYLE
Quon, B. S., Ramsook, A. H., Dhillon, S. S., Mitchell, R. A., Boyle, K. G., Wilcox, P. G., & Guenette, J. A. (2020). Short-term effects of Lumacaftor/Ivacaftor (OrkambiTM) on exertional symptoms, exercise performance, and ventilatory responses in adults with cystic fibrosis. Respiratory Research, 21(1). https://doi.org/10.1186/s12931-020-01406-z
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