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Characterization and Detection of Prolonged Endothelin Receptors Antagonists Administration

Information source: Center for Health, Exercise and Sport Sciences, Serbia
ClinicalTrials.gov processed this data on August 23, 2015
Link to the current ClinicalTrials.gov record.

Condition(s) targeted: Pulmonary Hypertension

Intervention: Bosentan (Drug); Ambrisentan (Drug); Placebo (Drug)

Phase: Phase 2/Phase 3

Status: Completed

Sponsored by: Center for Health, Exercise and Sport Sciences, Serbia

Official(s) and/or principal investigator(s):
Sergej M Ostojic, MD, PhD, Study Director, Affiliation: Center for Health, Exercise and Sport Sciences


Endothelin receptors antagonists (ERA), such as bosentan and ambrisentan, are a class of vasoactive drugs that have been developed for the treatment of pulmonary arterial hypertension. It has been anecdotally reported that ERA is frequently used among top-level athletes to counteract exercise-induced rise in pulmonary vascular pressures and increase exercise performance. Yet, the effects of ERA on exercise capacity in healthy humans are puzzling, with the drugs not included in the current Prohibited List, since the ergogenic potential is yet to be fully understood and determined. Furthermore, the urinary excretion of ERA metabolites following administration has not been studied systematically at rest and during exercise in athletes, as a way to detect its intake if performance-enhancing potential is confirmed. In the planned study ERA will be administered in newly approved doses for 8 weeks in order to assess the presumed doping potential for both male and female athletes, and to monitor serum and urinary ERA excretion dynamics after single- and multiple-dose administration. The possible effects of prolonged ERA administration in higher doses on exercise performance may be relevant, if further confirmed, in terms of their possible fraudulent utilization to influence exercise performance in sports, raising the difficult question of whether, particularly in some circumstances, the ERA might be considered as prohibited substances in athletes.

Clinical Details

Official title: Phase 3 Characterization and Detection of Prolonged Endothelin Receptors Antagonists Administration

Study design: Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor), Primary Purpose: Basic Science

Primary outcome: Maximal oxygen uptake

Secondary outcome: Plasma concentration of bosentan

Detailed description: Preliminary findings of our research group indicated that ERA enhances exercise performance (particularly aerobic) after 7-day intake of higher doses of non-selective ERA bosentan (doses used were approved for pulmonary arterial hypertension treatment). This is in part in accordance with results of previous research (Faoro et al. 2009), although authors administered regular single dose (62. 5 mg) of bosentan in hypoxic healthy subjects. Our study should examine metabolic profiles of athletes after receiving significantly higher doses of two oral ERA as compared to previous research, along with assessment of ergogenic potential with 8 weeks of administration in placebo-control and randomized design. We expect that ERA will increase time to exhaustion during endurance test, increase the maximal oxygen uptake and rate of ultra-short term heart rate recovery after exercise, and affecting blood and urine cortisol, testosterone and dehydroepiandrosterone following administration. Moreover, we will clearly evaluate 24-h pharmacokinetic profile of ERA in blood and urine and collect data for concentration-time profiles of ERA and main active metabolites, in aim to provide more rationale basis for identification and detection for doping control.


Minimum age: 20 Years. Maximum age: 30 Years. Gender(s): Both.


Inclusion Criteria:

- male and female volunteers

- experienced in athletic training (> 5 years of experience)

- aged 20 to 30 years

- free from musculoskeletal dysfunctions

- free from metabolic and heart diseases

Exclusion Criteria:

- pregnancy

- use of hormonal contraceptives

- use of dietary supplement that contains any ergogenic agent

Locations and Contacts

Center for Health, Exercise and Sport Sciences, Belgrade 11000, Serbia
Additional Information

Project info page

Starting date: January 2011
Last updated: May 7, 2013

Page last updated: August 23, 2015

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