Potassium Impacts Muscle Fatigue

Potassium Impacts Muscle Fatigue After a certain number of lifts, your muscles aren't able to generate the same amount of force you had working on that first set. Muscle fatigue is familiar to anyone who's tried to push through a weight room plateau, but the idea that lactic acid buildup is to blame might not be entirely accurate. A study published in The Journal of General Physiology suggests that potassium plays an important part.

Using your muscles causes an influx of sodium ions and an output of potassium. Analyzing the levels of sodium, potassium and chloride in the muscles of lab rats working their leg muscles with the intensity of a human pedaling a bike showed enough potassium was lost after 5 minutes to interfere with muscle contractions.

True Strength Moment: Although potassium levels aren't the only factor contributing to muscle fatigue, this discovery shows how nutrients can impact exercise at the cellular level. Eating a healthy balanced diet goes well beyond protein, carbohydrates and fat.
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