研究的受试人员为10个受过训练的自行车运动员，试验模拟在三种情况下的80公里自行车赛。
The research was conducted on 10 trained cyclists who performed a simulated 80 km bicycle race on three occasions.
有项高海拔自行车赛的试验，应用血管扩张剂以后(万艾可的化学名)，运动员每6公里可以缩短15%的时间。
A study of cyclists who took sildenafil citrate (the chemical name for Viagra) while racing at altitude found that it reduced their time over 6km by 15 per cent.
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