“…However, the performance in one-leg-standing also includes motor and balance functions, which were also impaired in some cases. Tremor and trembling was observed in six cases (4, 13, 14, 15, 16 and 18) and may be based on indirect stimulation of b 2 -adrenoceptors in muscle tissue [21], effects on the neuromuscular junction [22] or effects on the caudate nucleus where amphetamine has been shown to be strongly tremorogenic [23]. On the other hand, slight trembling has also been reported as a withdrawal symptom [1,14].…”