Authors ：Eschbach LF. Webster MJ. Boyd JC. McArthur PD. Evetovich TK.
Title ：The effect of siberian ginseng (Eleutherococcus senticosus) on substrate utilization and performance.
International Journal of Sport Nutrition & Exercise Metabolism.
10(4):444-51, 2000 Dec.
It has been suggested that Eleutherococcus senticosus (ES), also known as Siberian ginseng or ciwuija, increases fat utilization in humans. The purpose of this study was to examine the physiological responses to supplementation with ES in endurance cyclists. Using a randomized, double-blind crossover design, 9 highly-trained men (28 +/- 2 years, VaO2max 57.3 +/- 2.0 ml a kg-1 a min-1) cycled for 120 min at '60% VaO2max followed by a simulated 10-km time trial. Diet was controlled, and ES (1,200 mg a day-1) or a placebo (P) were administered for 7 days prior to each of the two trials. Oxygen consumption, respiratory exchange ratio, and heart rate were recorded every 30 min, and rating of perceived exertion, plasma [lactate], and plasma [glucose] were recorded every 20 min during the 120 min of steady state cycling. There were no significant differences (p >.05) between the ES and P groups at any steady-state time interval or during the cycling time trial (ES = 18.10 +/- 0.42, P = 17.83 +/- 0.47 min). In contrast with previous reports, the results of this study suggest that ES supplementation does not alter steady-state substrate utilization or 10-km cycling performance time.
Authors ：Dowling EA. Redondo DR. Branch JD. Jones S. McNabb G. Williams MH.
Institution ：Department of Health, Physical Education, and Recreation, Old DominionUniversity, Norfolk, VA 23529-0196, USA.
Title ：Effect of Eleutherococcus senticosus on submaximal and maximal exercise performance.
Medicine & Science in Sports & Exercise. 28(4):482-9, 1996 Apr.
We investigated the effect of Eleutherococcus senticosus Maxim L (ESML) on performance during submaximal and maximal aerobic exercise. Twenty highly trained distance runners randomly assigned in matched pairs to either an experimental (ESML) or placebo (PL) group, participated in an 8-wk double-blind study during which they completed five trails of a 10-min treadmill run at their 10 km (10K) race pace and a maximal treadmill test (T(max)). Following a baseline trail, ESML and PL consumed, respectively, 3.4 ml of ESML extract or placebo daily for 6 wk. Subjects were tested every 2 wk during supplementation and 2 wk following withdrawal. Heart rate (HR), oxygen consumption (VO2), expired minute volume (VE), ventilatory equivalent for oxygen (VE/VO2), respiratory exchange ratio (RER), and rating of perceived exertion (RPE) were measured during the 10K and T(max) tests. Resting, post-10K and post-T(max) blood samples were analyzed for serum lactate. No significant differences were observed between ESML and PL for: HR, VO2, VE, VE/VO2, RER, or RPE; T(max) time to exhaustion; or serum lactate. The data do not support an ergogenic effect of ESML supplementation on selected metabolic, performance, or psychologic parameters associated with submaximal and maximal aerobic exercise tasks.