While there was no improvement in maximal oxygen consumption or peak workload in well trained cyclists, the subjects taking 1 gm of fish oil supplement 8 times a day for 8 weeks had lower heart rates, and sub-maximal oxygen consumption. Unfortunately, time to voluntary fatigue was no different.
What does it all mean? Fish oil apparently somehow reduces oxygen demand during exercise, which isn't a bad thing. The study abstract doesn't mention how long the subjects were exercised, which makes me wonder if there might not be some value for marathon runners- even a slightly more efficient cardiovascular function over 26 miles could be significant.
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