An interventional study of Protein and tea extract and Protein in Muscle Recovery, sponsored by University of Fribourg. Recruiting at 1 site in Switzerland. Open to participants aged 18 Years to 40 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-05-04.
Sponsored by University of Fribourg · Not applicable, Interventional, and Basic science
In this research project, we want to investigate whether the combined intake of proteins and tea extract has an influence on muscle regeneration compared to the sole intake of proteins or a placebo product. In the study, you will be randomly assigned to one of 3 groups. Neither the research group nor you will know which group you are assigned to. The study lasts 5 days for you as a participant. During these 5 days you will have to attend a total of 5 appointments in our laboratory. The groups differ only in the intake of the regeneration product, otherwise all measurements and appointments are identical. You will jog downhill for 30 minutes on the first day in order to strain your muscles. In order to be able to draw conclusions about the regeneration of your muscles, we will carry out the following measurements on all 5 days: Blood sampling at the fingertip, ultrasound of the thigh muscle, pain tolerance of the thigh muscle, strength tests of the thigh muscle, muscle function of the thigh muscle and jumping performance.
University of Fribourg is the lead sponsor of 16 studies on the registry; 7 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
This group will receive a recovery drink containing protein and tea extract.
Dietary Supplement: Protein and tea extract
This group will receive a recovery drink containing protein without tea extract.
Dietary Supplement: Protein
This group will receive a recovery drink containing a placebo product. The placebo product is a non-isoenergetic, non-protein, artificially flavoured liquid.
Dietary Supplement: Placebo
Participants in this group will receive 4 times a recovery drink containing protein and tea extract.
Participants of this group will receive ten times a recovery drink containing only protein without tea extract.
Participants of this group will receive 10 times a placebo containing no protein nor tea extract.
Change in maximum knee extension force immediately after training-induced muscle damage and 24, 48, 72, and 96 hours thereafter compared to baseline.
The maximal force is measured in Nm while the participant is seated on an isokinetic device.
Time frame: 5 days
Change in jump performance immediately after training-induced muscle damage and 24, 48, 72, and 96 hours thereafter compared to baseline.
The jump performance is measured in cm while the participant are performing counter movement jumps.
Time frame: 5 days
Change in perceived pain immediately after training-induced muscle damage and 24, 48, 72, and 96 hours thereafter compared to baseline.
Perceived pain is measured in Pa while the participant is seated on the isokinetic device. The measurement point is on vastus medialis muscle.
Time frame: 5 days
Change in muscle thickness immediately after training-induced muscle damage and 24, 48, 72, and 96 hours thereafter compared to baseline.
Muscle thickness is measured with b-mode ultrasound in mm while the participant is sitting on the isokinetic device. The measurement point is on the vastus medialis muscle.
Time frame: 5 days
Change in creatine kinase levels immediately after exercise-induced muscle damage and 24, 48, 72, and 96 hours thereafter compared to baseline.
Creatine kinase is measured in U/L and determined using a capillary finger blood sample of 0.25 ml.
Time frame: 5 days
Plan to share: No — It is planned that only our research group will analyze and publish the data. Therefore, the data will not be passed on to other researchers.
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Studies of the drugs tested here: Proteins · Tea
University of Fribourg