As a result of the use of roller skates for recreation or sports on uneven surfaces other than a special one, there is a significant amount of mechanical energy absorbed by the frame of the skates as a result of unevenness, as well as combinations of jumps and landings from different heights. Scientific study on this issue will provide an opportunity to gain an insight into how much mechanical stress is distributed to а skate frame and to determine under what conditions the frame will be destroyed.
- Sen. Res. Assoc. I deg. DMSs. Mutafov, St. Stefan, Prof. Dr. Ivan T. Goranov. ANTHROPOLOGICAL-ERGONOMIC CHARACTERISTICS OF THE BULGARIAN POPULATION, Sofia 1985.