The time it takes the Earth to rotate once is called a sidereal day. The actual rotation time is about 23 hours and 56 minutes. The mean solar day is longer, exactly 24 h â¦ ours, because of the distance the Earth moves in its orbit around the Sun.he actual rotation time is a little less, about 23 hours and 56 minutes. But the solar day is longer, almost exactly 24 hours, because of the distance the Earth moves in its orbit around the Sun. The Earth has to turn that extra 4 minutes to again directly face the Sun.
akinesia. 1. absence or loss of the power of voluntary movement. 2. the temporary paralysis of a muscle by the injection of procaine. akinesia alÂ´gera a condition characterized by generalized pain associated with movement of any kind.(Ä-ki-nÄ'sÄ-Ä, Ä-kÄ«-),. absence or loss of the power of voluntary movement. 2. the temporary paralysis of a muscle by the injection of procaine. akinesia alÂ´gera a condition characterized by generalized pain associated with movement of any kind. (Ä-ki-nÄ'sÄ-Ä, Ä-kÄ«-),
The term bradykinesia was first used by James Parkinson to describe one of the cardinal features of the disease that now bears his name. It is now recognized, however, that bradykinesia may be part of the motor dysfunction in many movement disorders. Bradykinesia is often used synonymously with two other terms: akinesia and hypokinesia. Strictly speaking, bradykinesia describes the slowness of a performed movement, whereas akinesia refers to a poverty of spontaneous movement (e.g. in facial expression) or associated movement (e.g. arm swing during walking).