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 Fiber (MDF) is a building material used for construction purposes. It is made by the breakdown of hardwood and softwood with resins and wax to form wood fibres. It is much denser than the normal plywood board and came into being in late 1980s.