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Some studies indicate that maximal oxygen capacity (VO2 max), which measures the greatest volume of oxygen that can be dispatched to your muscles during exercise, falls in active women who use oral contraceptives. Other studies suggest that women on the pill lose some endurance and strength. But some women feel it helps performance by reducing menstrual symptoms. Talk to your doctor for more information on the pill and athletic performance. And even then be sure to weigh up your options carefully.
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I've been running for half a year, now, but I haven't had the guts to participate at a competition, because I'm afraid everyone else is better than me ... I am physically healthy, I've even had a tele radiology test last week to check myself. I should probably buy the book, reading usually gives me a lot of confidence.
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