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General interest items edited by Janice Flahiff

[News item] Vitamin supplements may lower exercise endurance (but the jury seem to be out)

Vitamin supplements may lower exercise endurance |BBC Health

Excerpts:

Taking some types of vitamin supplement may make it harder to train for big endurance events like marathons, researchers in Norway suggest.

They said vitamins C and E should be used with caution as they may “blunt” the way muscles respond to exercise.

However, actual athletic performance was not affected in the 11-week trial leading other experts to questions the research.

The findings were published in The Journal of Physiology.

The team at the Norwegian School of Sport Sciences in Oslo argued vitamin supplements were readily taken and available, but were unsure if they affected athletic ability.

Endurance runs

There was no difference in their performance during a Beep test – running faster and faster between two points 20m apart.

However, blood samples and tissue biopsies suggested there were differences developing inside the muscle.

Each muscle cell contains lots of tiny mitochondria which give the muscle cell its energy.

Those taking the supplements seemed to be producing fewer extra mitochondria to cope with the increasing demands placed on the muscle.

Hmmm

However, Mike Gleeson, a professor of exercise biochemistry at Loughborough University, is not convinced.

He said the biggest factor in performance was how fast the heart and lungs could get oxygen to the muscle, not mitochondria.

 

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November 3, 2014 - Posted by | Medical and Health Research News, Nutrition | , , ,

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