Minute ventilation increased ( AUE@-@ h @ % , P < @ ) and end-tidal carbon dioxide ( -LSB- Formula : see text -RSB- ) decreased ( AUE@-@ h @ % , P < @ ) during the first hour at @ mg kg ( -@ ) h ( -@ ) with @/@-maximal -LSB- Formula : see text -RSB- and -LSB- Formula : see text -RSB- - change occurring by @ min .