A subcategory of speed is quickness, which is the ability of the central nervous system to contract, relax or control muscle function without involvement of any preliminary stretch. Quickness is measured as the time interval or reaction time between voluntary stimulation and the initiation of movement. This time should be distinguished from absolute movement speed, which is the interval from the beginning to the end of movement.
- ↑ Baggett, Kelly (n.d.). Quickness and Absolute Speed vs Sports Speed and Explosiveness. Higher-Faster-Sports.com. Retrieved on 2008-08-03.