【黃新傑】評論
找到的資料跟解答有差異Preferred transition speed[edit]The preferred transition speed (PTS) is the speed at which an organism typically changes from one gait to another. Humans spontaneously switch from a walk to a run as speed increases. In humans, the preferred transition speed from walking to running typically occurs around 2.0 m/s (7.2 km/h; 4.5 mph), although slight differences have been shown based on testing methodology.https://en.wikipedia.org/wiki/Transition_from_walking_to_running