&gt;Sports medicine has always been a bit more pragmatic than other branches of medicine. &quot;We have no idea how this works, but it makes people run&#x2F;swim faster, so let&#x27;s do it!&quot;<p>Doesn&#x27;t sports medicine still blame lactic acid as the cause of muscle fatigue?<p><a href="http:&#x2F;&#x2F;www.details.com&#x2F;story&#x2F;lactic-acid-workout" rel="nofollow">http:&#x2F;&#x2F;www.details.com&#x2F;story&#x2F;lactic-acid-workout</a>