Physical Education - Ergogenic aids - illegal: caffeine
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The athlete benefits from an increase in free fatty acids. This increases
endurance  capacity by saving glycogen  stores, as it enables more
fats to be used as fuel thereby reducing and postponing muscle fatigue.
There is also increase in muscle/cell membrane permeability to Ca2+ ions,
increasing muscle contractility. Reaction time  and strength are
improved. It has been suggested that performance time in a marathon (normal
time two and a half hours) may be decreased by as much as 10 minutes with
the ingestion of caffeine before and during the event. (Costill 1978)
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