Researchers from the Universities of Hildesheim, Bonn and Freiburg have revealed at the molecular level how human skeletal muscle responds to resistance exercise. Their findings provide new insights that may help athletes optimize training programs, improve rehabilitation strategies, and prevent age-related muscle loss. Resistance training is essential for maintaining healthy skeletal muscle throughout life. The World Health Organization now recommends that even older adults perform moderate strength-strengthening activities at least twice a week to prevent muscle weakness. The new research is published in the current issue. nature communications.
Regular physical activity is very important for healthy aging. However, endurance exercise alone is not enough to maintain muscle mass. High-intensity resistance exercise is necessary to gain or maintain skeletal muscle. Such exercise also places considerable mechanical stress on muscle fibers, causing microscopic damage to the contractile mechanisms involved in force generation. Until now, little was known about how skeletal muscle repairs this damage and adapts to repeated strength training. A multidisciplinary team of exercise physiologists, cell biologists and proteomics experts from the Universities of Hildesheim, Bonn and Freiburg provided important new insights into these underlying mechanisms.
Resistance training activates muscle repair mechanisms
To investigate these processes, the researchers took muscle biopsies from healthy volunteers before and after high-intensity resistance exercise. They also investigated how long-term training reduction and complete cessation of resistance exercise affected these molecular adaptations. Using a cutting-edge proteomics approach, the research team identified dynamic changes within the skeletal muscle contractile apparatus.
Researchers found that resistance training activates a specialized repair system that recognizes damaged muscle components and targets them to eliminate them. At the same time, this repair mechanism promotes the synthesis of new contractile proteins to replace damaged proteins. This coordinated process preserves and strengthens the muscle’s contractile apparatus. This study identified previously unknown components of this muscle repair network and revealed how they are regulated in response to resistance training.
Interdisciplinary collaboration enables new discoveries
Our analytical approach allowed us to identify proteins that are recruited to the contractile apparatus after resistance exercise, where they exert essential protective and repair functions. ”
Professor Pitter Hüsgen, proteomics expert, University of Freiburg
The functions of these proteins were then studied in the laboratory of Professor Jörg Hefeldt at the Institute of Cell Biology at the University of Bonn. “Using cultured muscle cells, we demonstrated that these repair proteins first recognize damaged muscle structures and then remove them through a cellular degradative pathway known as autophagy. This opens the way to muscle repair and adaptation to strength training,” said Professor Hefeld, who is also a member of the Steering Committee of the Life and Health Transdisciplinary Research Area at the University of Bonn.
Implications for training and rehabilitation
Professor Sebastian Gehlert and his team at the University of Hildesheim collected human muscle biopsies and performed an initial analysis of exercise-induced damage to the contractile apparatus.
“Our findings reveal how training intensity and training history influence both muscle damage and the activation of repair mechanisms,” says Professor Gehlert. “This knowledge will help optimize patient rehabilitation programs in clinical practice as well as the sequence of training sessions for athletes.”
Professor Gehlert has already incorporated these findings into the education of exercise scientists and into evidence-based training strategies for elite athletes at Germany’s Olympic Training Center and for members of the police and military.
Funding and participating institutions
The study was carried out in collaboration with researchers from the University of Hildesheim, the University of Bonn, the University of Freiburg, the German Sport University Cologne and the University of Duisburg-Essen. This research was supported by the German Space Agency of the German Research Foundation (DFG) and the German Aerospace Center (DLR).
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Reference magazines:
Kupusamy, M. others. (2026). Differential proteomics identifies a protein network that reduces resistance exercise-induced damage in human skeletal muscle. nature communications. DOI: 10.1038/s41467-026-75501-y. https://www.nature.com/articles/s41467-026-75501-y
