In 1980 Alberca et al. described a patient with a syndrome of increased muscle irritability, who presented ondulating muscle rolling movements and electrically silent cramps, myoedema and muscle reactions to mechanical stimulation similar to myotonic response, suggesting a disfunction at myofibrillar level.
For c-3po, it was a costume, Anthony Daniels played c-3po: For R2-D2, It was a costume and a remote controlled robot. CGI was also used in the prequel trilogy. So, they had Kenny Baker to play him : And from Portrayal section of wookieepedia article on R2-D2 :
109 Poâipu (The Siege) â Ric Young, who plays General Pak, also played a travel agent (as Eric Young) in the episode Nine Dragons in the original series. 109 Poâipu (The Siege) â McGarrett (Alex O'Loughlin) gives his address as 2727 Piikoi St. In the original series, Steve McGarrett also lived on Piikoi St.