It can feel intuitive that the key to building strength is to put the target area under a certain amount of stress to cause healing to leave the condition stronger than before the applied stress. It seems to apply much more to muscles than tendons, however.
https://experiencelife.com/article/tendon-trouble/ -- "Tendinosis, on the other hand, stems from chronic overuse rather than a single acute event. “With tendinosis, there’s an abnormal collagen or protein buildup — the tendon’s microfibers start to resemble sticky, overcooked spaghetti,” says Karim Khan, MD, PhD, assistant professor of family medicine and human kinetics at the University of British Columbia in Vancouver and coauthor of Clinical Sports Medicine (McGraw-Hill, 2006).
Damage occurs at a microscopic level long before symptoms of pain, tightness and soreness appear. As with tendinitis, you might feel anything from a slight twinge to a jabbing pain.
Tendinosis usually occurs because you have not rested enough between workouts that require heavy or stressful loading to the affected area. But, because researchers have ˙ not specifically identified an optimal rest period to prevent the condition, many fitness experts simply recommend that you follow a periodized program, with built-in deloading phases, to help prevent such overuse injuries. (For more on periodization, see “Chart a Course to Fitness” in the December 2007 archives.) Cross-training can also help you avoid overusing a particular area.
Unlike tendinitis, tendinosis often requires at least three to six months for recovery. “It’s not realistic to think you can heal in, say, six weeks, because it probably took a lot longer than that to reach the point of pain,” says Bryan Chung, MD, PhD, founder of the blog Evidence-Based Fitness (
www.evidencebasedfitness.blogspot.com).
Some physicians even stretch that recovery period to nine months or more. Tendinosis takes a considerable amount of time to heal because of limited blood flow to tendons, and because it can take 100 days for your body to reestablish strong collagen, which repairs damage."