Nsca Practice Test & Exam Prep

The main idea is that connective tissue adapts where mechanical forces are transmitted between muscle fibers—the extracellular matrix that lies between groups of fibers, around fascicles (the perimysium/epimysium). Resistance training stimulates collagen synthesis and reorganization in this tissue, increasing its stiffness and capacity to transmit force from the contracting fibers to the tendons. This helps the muscle handle higher loads and reduces injury risk. Inside the muscle fiber cytoplasm, adaptations are more about metabolic and contractile components (like more myofibrillar proteins and enzymes), not connective tissue. While tendons and bone-tendon junctions can remodel with load, the site most likely to show connective tissue changes in response to typical training is the tissue between groups of muscle fibers.