SERVICE DE PHYSIOLOGIE ET D'EXPLORATIONS FONCTIONNELLES - Nouvel Hôpital Civil
Strasbourg, 67091, France
Completed
NCT Number: NCT02070848
Muscle Blood Flow During Exercise
Physical exercise triggers various physiological responses including a marked increase in muscle blood flow and oxygen delivery in order to support muscle activity. How muscle blood flow is controlled is currently unclear.
The primary purpose of this study is to establish the respective contribution of metabolic (linked to energy requirements) and mechanical (linked to muscle tensions) signals in the exercise hyperemia and the possible role of the red blood cells.
Vasodilation and muscle blood flow during exercise are controlled by ATP released in the plasma from the red blood cells in response to a combination of metabolic and mechanical signals applied on the vasculature.
Completed
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Conditions
Age range
18 year–45 year
Sex eligibility
Male
Study type
Observational
Primary location
Who can participate
Healthy volunteers accepted: Yes
Only the study team can determine whether someone qualifies for participation.
Inclusion criteria
- Non smoker or having stopped smoking for at least 5 yr
- Practice sports: physical activity level will be evaluated with a questionnaire (de Baecke et coll., 1982) and will give an activity index greater than 6 together with a VO2max greater than 50 ml/kg/min
- Body mass index lower than 25
- Registered to the French Social Security system
- Providing a written and informed consent to participate in the study
Exclusion criteria
- History of venous or arterial thrombo-embolic events
- Bad perfusion from the cubital artery
- Unable to understand the information notice
- Subject exposed to law investigations or with financial dependancy
- Subjects feeling unwell whan seing blood.
- Subjects advised to not practice sport.
- Musculo-tendinous or articular issues with the lower leg
- Respiratory, cardiovascular or metabolic pathologies
- Current medical treatment that can not be stopped 7 days before the experiment.
Treatment and study plan
Session 1-4
OtherFamiliarization sessions to knee-extensor exercise separated by 72h recovery
Session 4
OtherAfter the last familiarization session, 1 maximal incremental test on a bicycle, followed by 72h rest
Session 5
Other2 maximal incremental tests of knee-extension exercise (concentric vs eccentric), separated by 3h rest.
Primary outcomes
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Change in leg blood flow during concentric and eccentric muscle work
Time frame: Leg blood flow measurements during exercises performed at the beginning, after 14 minutes, then after 18 min, 22 min, 26 min, 30 min, 33 min, 35 min and 45 min
Serial measures (9) of leg blood flow during concentric and eccentric muscle work are performed at the beginning of the exercise (t0), and then after 14 minutes (t14), after 18 minutes (t18), after 22 minutes (t22), after 26 minutes (t26), after 30 minutes (t30), after 33 minutes (t33), after 35 minutes (t35), and after 45 minutes (45) during each exercice, concentric and eccentric.
Sponsors and collaborators
Lead sponsor
University Hospital, Strasbourg, France
Other
Registry information
Official study title
Muscle Blood Flow Control During Exercise in Humans: Contribution From Mechanical and Metabolic Signals and Role of the Erythrocyte.
Important dates
- Study start
- 2018
- Primary completion
- 2018
- Study completion
- 2018
- First posted
- Feb 25, 2014
- Registry last updated
- Mar 5, 2021
OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.
View the official ClinicalTrials.gov record (opens in a new tab)This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.