Word: powerlung
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...concluded that Mintenko blew it?literally?at the 75-m mark. The analysis showed that Mintenko's shallow breathing after the 50-m turn didn't allow him to maintain enough oxygen to keep his muscles from tiring. In February Mintenko tried out a device, made by Houston-based PowerLung, that looks like a glorified asthma inhaler. It forces the user to work harder to pull air in and push it out. After using the PowerLung for a week, Mintenko began to see an improvement in his oxygen capacity...
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