tokens: In a double blind , crossover study 6 h infusions of adrenaline ( 15 ng / kg / min ; 1 ng = 5 . 458 pmol ) , noradrenaline ( 30 ng / kg / min ; 1 ng = 5 . 911 pmol ) , and a 5 % dextrose solution ( 5 . 4 ml / h ) , were given to ten healthy volunteers in random order 2 weeks apart .