Runners training for a marathon can get a stress fracture if they. escalate their training too quickly. Stress fractures occur when too much weight or stress is put on a weakened bone. It's often the result of an imbalance in bone health caused by actions that outpace the body's natural bone rebuilding process. See Stress Fracture Risk Factors.
idf - Computer Definition. A distribution frame that serves as an intermediate point of inside cable and wire interconnection between the main distribution frame (MDF) and the terminal blocks or terminal outlets. See also MDF.
Medium density fiberboard (MDF) is a high grade, composite material that performs better than solid wood in many areas. Made from recycled wood fibers and resin, MDF is machine dried and pressed to produce dense, stable sheets. MDF is more stable than solid wood and stands up better to changes in heat and humidity.