Ginseng appears to improve stamina and endurance by exerting an effect on the
respiratory system and also on energy metabolism.
A placebo controlled trial on 15 young healthy men found a significant reduction
in ventilation during submaximal exercise following ingestion of 1 gram American
ginseng powder. The results suggest that ginseng can increase respiratory
endurance and support the observation of Forgo (1983) that American ginseng
improves cardiovascular endurance during submaximal work.
In a Canadian study, injecting rats with ginsenosides Rg1 or Rb1 significantly
prolonged aerobic exercise endurance of non-trained animals. Both plasma free
fatty acid (FFA) and glucose levels were raised during exercise. Liver and
muscle glycogen levels were higher in treated animals after exhaustive exercise.
The author hypothesised that both Rg1 and Rb1 altered fuel homeostasis during
prolonged exercise by increasing FFA utilisation over glucose for cellular
energy demands.
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