NCT07113405

Influence of Tea Extract on Maximal Voluntary Knee Contraction Following Downhill Jogging

The Influence of Tea Extract on Maximal Voluntary Knee Contraction After 30 Minutes of Downhill Jogging: a Randomized, Double-blind, Placebo-controlled Study

• Status: Recruiting
• Phase: N/A
• Study type: Interventional
• Enrollment: 60 (estimated)
• Sponsor: University of Fribourg · Academic / Other
• Sex: All
• Age: 18 Years – 40 Years
• Healthy volunteers: Accepted

Summary

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.

Conditions

• Muscle Recovery

Interventions

Type	Name	Description
DIETARY_SUPPLEMENT	Protein and tea extract	Participants in this group will receive 4 times a recovery drink containing protein and tea extract.
DIETARY_SUPPLEMENT	Protein	Participants of this group will receive ten times a recovery drink containing only protein without tea extract.
DIETARY_SUPPLEMENT	Placebo	Participants of this group will receive 10 times a placebo containing no protein nor tea extract.

Timeline

• Start date: 2025-12-01
• Primary completion: 2026-12-30
• Completion: 2026-12-30
• First posted: 2025-08-08
• Last updated: 2025-12-05

Locations

1 site across 1 country: Switzerland