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Definition: "An ergogenic aid is any substance or phenomenon that enhances performance "
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11.12.2012 |
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Grape Seed Extract keeps big eaters' weight down
Grape Seed Extract is an interesting supplement. It improves blood circulation; animal studies have shown that it reduces the chance of prostate cancer, and epidemiological studies have shown that it reduces the chance of skin cancer. In-vitro studies have shown that it sabotages the conversion of testosterone into estradiol by the enzyme aromatase.
The researchers let their test subjects eat as much as they wanted during a three-day stay in a laboratory. About 30-60 minutes before their breakfast, lunch and dinner the subjects took a supplement containing 100 mg Grape Seed Extract. A couple of weeks later the researchers repeated the experiment, but gave their subjects a placebo.
The effect of supplementation was related to the caloric intake of the subjects. If calorie intake was lower than average then Grape Seed Extract had no effect on the energy intake, as shown in the table below. The 'small eaters' consumed an average of 1500 kcal per day.
In the subjects with an above-average energy consumption Grape Seed Extract did reduce energy intake, as shown in the table below. The average energy intake of this group was 2030 kcal per day.
Among the 'big eaters' the Grape Seed Extract supplement reduced their energy intake by 96 kcal per day. If that effect were to last for a whole year, then people with high caloric requirements could lose 3.7 kg body fat in that amount of time.
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