Without variable valve timing or variable valve lift, the valve timing must be the same for all engine speeds and conditions, therefore compromises are necessary. An engine equipped with a variable valve timing actuation system is freed from this constraint, allowing performance to be improved over the engine operating range.
A variety of medical specialists treat people with osteoporosis, including internists, gynecologists, family doctors, endocrinologists, rheumatologists, physiatrists, orthopaedists, and geriatricians. There are a number of ways to find a doctor who treats osteoporosis patients. If you have a primary care or family doctor, discuss your concerns with him or her. Your doctor may treat the disease or be able to refer you to an osteoporosis specialist.
A doctor of osteopathy typically practices manipulative medicine treatment in addition to more traditional methods of symptom relief and prevention. A doctor of osteopathy studies the body as a whole. A doctor of osteopathy is less likely to specialize than a medical doctor. Doctor of Osteopathy (D.O.), more correctly called a Doctor of Osteopathic Medicine, is very much like a traditional medical doctor (M.D.), but receives additional training in the body's musculoskeletal system.