Space adaptation syndrome had not occurred on previous spacecraft (Mercury and Gemini), because those astronauts could not move freely in the small cabins of those spacecraft.
spˈeɪs ˌædæptˈeɪʃən sˈɪndɹoʊm hæd nˌɑːt əkˈɜːd ˌɔn pɹˈiːviəs spˈeɪskɹæft mˈɜːkjʊɹi ænd dʒˈɛmᵻnˌaɪ, bɪkˈʌz ðoʊz ˈæstɹənˌɔːts kʊd nˌɑːt mˈuːv fɹˈiːli ɪnðə smˈɔːl kˈæbɪnz ʌv ðoʊz spˈeɪskɹæft.