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.
(Intermediate Distribution Frame) A wiring rack located between the MDF (main distribution frame) and the intended end user devices (telephones, routers, PCs, etc.). Cables run from the outside world to the MDF and then to the IDFs. See MDF and wiring rack.
Medium-density fiberboard (MDF) is an engineered wood product formed from wood fibers obtained from breaking down hardwood and softwood with a defibrator. The wood fibers are then glued together using wax and resin adhesive. They are made into panels by applying high temperature and pressure. The resulting smooth wood product has no wood grain and shares many characteristics with particle board. However, MDF is slightly stronger particle board.