Collagen trial reports tissue changes, but the placebo comparison remains unclear
Healthy young sedentary men receiving collagen showed changes in tissue stiffness and rapid force production. The abstract reports changes within groups without giving a direct estimate of collagen versus placebo.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
The collagen group showed increases in calf muscle stiffness, Achilles tendon stiffness and the rate of force production at the ankle. The placebo group did not show statistically significant changes in those measures. However, that pattern alone does not establish a difference between groups; the abstract does not report the direct between-group comparison needed to assess superiority.
The reported statistics describe changes within each group rather than a direct treatment-versus-placebo effect. The participants were healthy young sedentary men, and the abstract does not report an athletic performance outcome.
What changed and what remained unclear
Stiffness describes how resistant tissue is to deformation. The reported increases concerned these mechanical properties and rapid ankle force production. Neither group showed statistically clear changes in tissue size or maximum force during a stationary contraction.
A relationship is not a mechanism
Muscle stiffness and rapid force production were positively correlated in both groups before and after supplementation. That relationship does not establish that greater stiffness caused the force changes or that supplementation would improve performance in a sport.
The original publication
Collagen Peptide Supplementation Enhances Muscle-Tendon Stiffness and Explosive Strength: A 16-wk Randomized Controlled Trial.
Miyamoto N, Ishihara K, Oshima T et al.
Med Sci Sports Exerc · 2025
- PubMed ID
- 40623147
- Record checked
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