Giulio Savia MD passed away on February 2009.
1755-5922/asset/CDR_left.gif?v=1&s=a1ba02e9afa370d63b87758f212db796a6022979)
RESEARCH
Effects of Beta-Blockade on Exercise Performance at High Altitude: A Randomized, Placebo-Controlled Trial Comparing the Efficacy of Nebivolol versus Carvedilol in Healthy Subjects
Article first published online: 11 MAR 2011
DOI: 10.1111/j.1755-5922.2011.00261.x
© 2011 Blackwell Publishing Ltd
Additional Information
How to Cite
Valentini, M., Revera, M., Bilo, G., Caldara, G., Savia, G., Styczkiewicz, K., Parati, S., Gregorini, F., Faini, A., Branzi, G., Malfatto, G., Magrì, D., Agostoni, P. and Parati, G. (2012), Effects of Beta-Blockade on Exercise Performance at High Altitude: A Randomized, Placebo-Controlled Trial Comparing the Efficacy of Nebivolol versus Carvedilol in Healthy Subjects. Cardiovascular Therapeutics, 30: 240–248. doi: 10.1111/j.1755-5922.2011.00261.x
This work was performed at the Capanna Regina Margherita, a shelter on top of Monte Rosa, Italian-Swiss Alps, at 4559 m above sea level, and at the S. Luca Hospital, IRCCS, Istituto Auxologico Italiano; Via Spagnoletto, 3. 20149, Milan, Italy.
- †
Giulio Savia MD passed away on February 2009.
Publication History
- Issue published online: 3 JUL 2012
- Article first published online: 11 MAR 2011
- Abstract
- Article
- References
- Cited By
Keywords:
- Autonomic nervous system;
- Beta receptor;
- Adrenergic receptor blockade;
- Cardiopulmonary exercise test;
- Carvedilol;
- Clinica trial;
- Hypoxia;
- Nebivolol
Summary
Aims
Exposure to high altitude (HA) hypoxia decreases exercise performance in healthy subjects. Although β-blockers are known to affect exercise capacity in normoxia, no data are available comparing selective and nonselective β-adrenergic blockade on exercise performance in healthy subjects acutely exposed to HA hypoxia. We compared the impact of nebivolol and carvedilol on exercise capacity in healthy subjects acutely exposed to HA hypobaric hypoxia.
Methods
In this double-blind, placebo-controlled trial, 27 healthy untrained sea-level (SL) residents (15 males, age 38.3 ± 12.8 years) were randomized to placebo (n = 9), carvedilol 25 mg b.i.d. (n = 9), or nebivolol 5 mg o.d. (n = 9). Primary endpoints were measures of exercise performance evaluated by cardiopulmonary exercise testing at sea level without treatment, and after at least 3 weeks of treatment, both at SL and shortly after arrival at HA (4559 m).
Results
HA hypoxia significantly decreased resting and peak oxygen saturation, peak workload, VO2, and heart rate (HR) (P < 0.01). Changes from SL (no treatment) differed among treatments: (1) peak VO2 was better preserved with nebivolol (–22.5%) than with carvedilol (–37.6%) (P < 0.01); (2) peak HR decreased with carvedilol (–43.9 ± 11.9 beats/min) more than with nebivolol (–24.8 ± 13.6 beats/min) (P < 0.05); (3) peak minute ventilation (VE) decreased with carvedilol (–9.3%) and increased with nebivolol (+15.2%) (P= 0.053). Only peak VE changes independently predicted changes in peak VO2 at multivariate analysis (R= 0.62, P < 0.01).
Conclusions
Exercise performance is better preserved with nebivolol than with carvedilol under acute exposure to HA hypoxia in healthy subjects.