Salt restriction increases fasting norepinephrine, a substance that increases heart rate.
--- Does it mean it increases the level of norepinephrine before one eats something (in the morning probably)?
Yes, before one eats anything and starts the day... such concentrations have clinical values (non-native speaker's answer)
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Yes, before one eats anything and starts the day... such concentrations have clinical values
(non-native speaker's answer)