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* '''''Muscles'''''. <ref name="MuscleTrappe"/>. A 2001 study showed that Ibuprofen and Acetaminiaphen reduce muscle growth after eccentric exercise. Another study<ref name="muscle"/> on muscle damage and NSAIDs showed impaired recovery in the early stages of healing. There was some increased protein synthesis with NSAIDs in latter stages of healing, but the muscles were still weaker 28 days after injury. Other studies<ref name="muscle2"/><ref name="muscle3"/> have shown that four days after injury, NSAIDs resulted in very little muscle regeneration compared with no drugs.* '''''Tendons'''''. A primate study<ref name="TendonPrimates"/> showed "a marked decrease in the breaking strength of tendons at four and six weeks in the ibuprofen-treated animals". Another animal study<ref name="TendonCOX2"/> showed treated tendons were 32% weaker than their untested counterparts. * '''''Bone-Tendon Junctions'''''. An animal study<ref name="tendon"/> of rotator cuff injuries shows that NSAID usage resulted in injuries that did not heal, and those that did heal were weaker than those without NSAID. To quote from the study "Given that NSAID administration was discontinued after 14 days yet affected load-to-failure eight weeks following repair, it appears that inhibition of the early events in the inflammatory cascade has a lasting negative effect on tendon-to-bone healing," Dr. Rodeo said. * '''''Cartilage. ''''' NSAIDs have been shown<ref name="CartilageRabbit"/> to impair the healing of bone and cartilage in rabbits. * '''''Bone fractures. ''''' Tests on rats shows that a NSAID (Celecoxib) in the early stages of bone healing impaired healing, producing a weaker repair.<ref name="bone"/> A study <ref name="BoneLaurence "/> in 2004 declared " Nonsteroidal anti-inflammatory drugs continue to be prescribed as analgesics for patients with healing fractures even though these drugs diminish bone formation, healing, and remodeling".