Role of interstitial potassium.
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Interstitial potassium concentration, [K+], is modulated during muscle activity due to a number of different mechanisms: diffusion and active transport of K+ in combination with water fluxes. The relative significance of the various mechanisms for muscle function is quantified. The effect of interstitial [K+] locally on the single muscle fiber is discussed along with its effect on the cardiovascular and respiratory systems and its role in motor control. It is concluded that K+ may play a significant role in the prevention as well as the development of fatigue.
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