Ephedra affects autonomic activity

Consumption of ephedra (Ma Huang, Ephedrae Herba) extract has both acute and chronic effects on autonomic nervous activity. Twenty healthy Taiwanese subjects were given 1g of ephedra dry extract or placebo once per day for 14 days in a crossover fashion with a seven-day washout period between treatments. Analysis of heart rate variability (HRV) showed that ingestion of ephedra caused the sympathov ...

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