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 Fibreboard (MDF) is a wood substitute form which is made from fine wood fibres in a resin which is bonded under heat and pressure.DF may be used instead of plywood or chipboard. It is dense, flat, stiff, has no knots and is easily machined. It is made up of fine particles and therefore does not have an easily recognisable surface grain. Can be obtained in natural colour in various thicknesses or self coloured.