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 rheumatologist is a medical doctor who specializes in treating rheumatic conditions and diseases. Typically an internist or pediatrician, rheumatologists analyze, diagnose, and treat the different illnesses that affect your joints, bones, and muscles.heumatologists are most commonly associated with arthritis diagnosis and treatment, although they also help treat a number of other rheumatic conditions, including: 1  musculoskeletal pain. 2  osteoporosis. 3  osteoarthritis. 4  gout. 5  lupus and other autoimmune diseases.