A muscle strain may tear the myofibrillar attachments from the intramuscular tendon, with resultant bleeding and edema.
In summary, exercise-based rehabilitation is the best treatment for tendon pain. A progressive program that starts with a strength program and then progresses through to more spring-like exercises, and endurance aspects will give the right loads on the tendon and the best long-term results.
Early loading after a muscle strain injury is important because immobilization can swiftly and adversely affect muscle and tendon structure and function.
Long-term stretching seems to occur mostly at a sensory level of the nervous system versus the mechanical properties of the muscle-tendon complex itself.