H J Engels1, J C Wirth. 1. Division of Health, Physical Education and Recreation-Exercise Science, Wayne State University, Detroit, MI 48202, USA.
Abstract
OBJECTIVE: To assess the effects of chronic supplementation with two different dosages of Panax ginseng C.A. Meyer on physiologic and psychological responses during graded maximal aerobic exercise. DESIGN: Randomized, double-blind, placebo-controlled trial. SUBJECTS:Thirty-six healthy men consuming an otherwise supplement-free diet who maintained their usual activity level. INTERVENTION: A standardized P ginseng C.A. Meyer concentrate (G115) was added to the normal diet of study participants at a dosage level of either 200 or 400 mg/day, where 100 mg of the preparation is equivalent to 500 mg P gingseng root. MAIN OUTCOME MEASURES: Submaximal and maximal aerobic exercise responses before and after an 8-week trial intervention. STATISTICAL ANALYSES PERFORMED: Analysis of variance. RESULTS:Thirty-one subjects completed the study. Supplementation with ginseng had no effect on the following physiologic and psychological parameters: oxygen consumption (mL/kg per minute), respiratory exchange ratio, minute ventilation (L/min), blood lactic acid concentration (mmol/L), heart rate (beats/min), and perceived exertion (P > .05). CONCLUSIONS: Our data in healthy men do not offer support for claims that P ginseng C.A. Meyer is an ergogenic aid to improve submaximal and maximal aerobic exercise performance.
RCT Entities:
OBJECTIVE: To assess the effects of chronic supplementation with two different dosages of Panax ginseng C.A. Meyer on physiologic and psychological responses during graded maximal aerobic exercise. DESIGN: Randomized, double-blind, placebo-controlled trial. SUBJECTS: Thirty-six healthy men consuming an otherwise supplement-free diet who maintained their usual activity level. INTERVENTION: A standardized P ginseng C.A. Meyer concentrate (G115) was added to the normal diet of study participants at a dosage level of either 200 or 400 mg/day, where 100 mg of the preparation is equivalent to 500 mg P gingseng root. MAIN OUTCOME MEASURES: Submaximal and maximal aerobic exercise responses before and after an 8-week trial intervention. STATISTICAL ANALYSES PERFORMED: Analysis of variance. RESULTS: Thirty-one subjects completed the study. Supplementation with ginseng had no effect on the following physiologic and psychological parameters: oxygen consumption (mL/kg per minute), respiratory exchange ratio, minute ventilation (L/min), blood lactic acid concentration (mmol/L), heart rate (beats/min), and perceived exertion (P > .05). CONCLUSIONS: Our data in healthy men do not offer support for claims that P ginseng C.A. Meyer is an ergogenic aid to improve submaximal and maximal aerobic exercise performance.
Authors: Lydia K Caldwell; William H DuPont; Matthew K Beeler; Emily M Post; Emily C Barnhart; Vincent H Hardesty; John P Anders; Emily C Borden; Jeff S Volek; William J Kraemer Journal: J Sports Sci Med Date: 2018-03-01 Impact factor: 2.988
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