However, the rendered protein sources used in most commercial pet foods put chronic strain on the kidneys and liver, so by the time a dog is into her senior years, her organs can no longer do their job efficiently. (darwinspet.com)
«An acute strain is an instantaneous stretch or tear of the muscle or tendon;» Mufich said, «whereas, a chronic strain stems from repetitive motions over time that place stress on the muscle or tendon.» (sciencedaily.com)
«An acute strain is an instantaneous stretch or tear of the muscle or tendon, whereas, a chronic strain stems from repetitive motions over time that place stress on the muscle or tendon,» Mufich said. (health.com)