Response to Clenbuterol in Humans

August 8, 2024 updated by: Morten Hostrup, PhD, University of Copenhagen

Detectability of Clenbuterol and Physiological Response in Human Skeletal Muscle

Due to the long half-life (~36 hr) of clenbuterol, detection methods such as dried blood spots (DBS) are a potentially suitable method to easily and non-invasively detect doping misuse of this compound for several days after ingestion. If, and how long, the compound can be detected by DBS has not yet been investigated but is of interest due to its potential in doping-control. The aim is to evaluate whether abuse of clenbuterol can be detected at relevant concentration levels in samples obtained using DBS and to assess the physiological response to clenbuterol in skeletal muscle..

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
16

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Denmark
      • Copenhagen, Denmark
        • August Krogh Building

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

14 years to 36 years (Adult)

Accepts Healthy Volunteers

Yes

Description

Inclusion Criteria:

  • Healthy
  • Male
  • 18-40 years of age
  • No known contraindications for anabolic drugs (e.g. cancer)

Exclusion Criteria:

  • Abnormal ECG
  • Steroid abuse
  • Ongoing use of prescription medication
  • heavy resistance training more than 2 times weekly
  • Disease deemed by the MD to infer a risk to participate in the trial

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Basic Science
  • Allocation: Randomized
  • Interventional Model: Crossover Assignment
  • Masking: Quadruple

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Clenbuterol
Subjects ingest 80 micrograms of clenbuterol tablets
Drug: Clenbuterol Oral Product
Subjects ingest 4x20 microgram clenbuterol tablets
Placebo Comparator: Placebo
Subjects ingest placebo tablets
Drug: Placebo
Subjects ingest placebo tablets

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Blood clenbuterol concentration
Time Frame: Before (baseline) as well as 3, 8, 24, 72, 168 and 240 hours after administration of clenbuterol
Concentration of clenbuterol in dried blood spots
Before (baseline) as well as 3, 8, 24, 72, 168 and 240 hours after administration of clenbuterol

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Blood clenbuterol concentration
Time Frame: Before (baseline) as well as 3, 8, 24, 72, 168 and 240 hours after administration of study drug
Concentration of clenbuterol in venous blood
Before (baseline) as well as 3, 8, 24, 72, 168 and 240 hours after administration of study drug
Urine clenbuterol concentration
Time Frame: Before (baseline) as well as 3, 8, 24, 72, 168 and 240 hours after administration of study drug
Concentration of clenbuterol in urine
Before (baseline) as well as 3, 8, 24, 72, 168 and 240 hours after administration of study drug
Muscle strength
Time Frame: Before (baseline) and 2.5 hours after administration of study drug
Maximal voluntary isometric contraction in N/m2 of the quadriceps
Before (baseline) and 2.5 hours after administration of study drug
Muscle signalling
Time Frame: Before (baseline) and 2.5 hours after administration of study drug
Protein kinase A phosphorylation in vastus lateralis biopsies
Before (baseline) and 2.5 hours after administration of study drug
Plasma K+
Time Frame: Before (baseline) as well as 2.5 hours after administration of study drug
Venous plasma K+ concentration
Before (baseline) as well as 2.5 hours after administration of study drug
Muscle mTOR signalling
Time Frame: Before (baseline) as well as 2.5 hours after administration of study drug
mTOR phosphorylation in vastus lateralis biopsies
Before (baseline) as well as 2.5 hours after administration of study drug
Metabolic rate
Time Frame: Before (baseline) as well as 2.5 hours after administration of study drug
Respriatory exchange ratio of oxygen and CO2
Before (baseline) as well as 2.5 hours after administration of study drug
Maximal voluntary strength
Time Frame: Before (baseline) and after two-week treatment of study drug
Maximal voluntary isometric muscle strength of the quadriceps
Before (baseline) and after two-week treatment of study drug
Body composition
Time Frame: Before (baseline) and after two-week treatment of study drug
Lean and fat mass during a DXA-scan
Before (baseline) and after two-week treatment of study drug
Aerobic capacity
Time Frame: Before (baseline) and after two-week treatment of study drug
Maximal oxygen uptake during maximal exercise
Before (baseline) and after two-week treatment of study drug

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
University of Copenhagen

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
March 11, 2019

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
December 21, 2022

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
December 21, 2022

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
February 26, 2019

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
February 28, 2019

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
March 4, 2019

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
August 9, 2024

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
August 8, 2024

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
August 1, 2024

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • CLEN

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

UNDECIDED

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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