The effect of eleutherococcus senticosus (siberian ginseng) on substrate utilization and performance during prolonged cycling - Eschbach, L. C.; Webster, M. J.; Boyd, J. C.; Eimer, A. J.; McArthur, P. D.; Zoeller, R. F.; Krebs, G. V.; Angelopoulos, T. J. (Medicine & Science in Sports & Exercise, 1999)