Table 1.

Dose rates and durations investigated in healthy volunteers.

Ref.	n	Age (Year)	Status	Rate (μmol·kg−1·min−1)	Duration (min)	Total (μmol·kg−1)
[23]	6	21–30	healthy	20	180	3600
[24]	9	30 ± 1	healthy	36	120	4320
[25]	7	54 ± 4	coronary disease	60	20	1200
[26]	8	23 ± 1	healthy	52	60	3120
[27]	8	25 ± 1	healthy	125	40	5000