Potassium, Na+,K+-pumps and fatigue in rat muscle.

Potassium, Na+,K+-pumps and fatigue in rat muscle. Research Abstract Details 

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Potassium, Na+,K+-pumps and fatigue in rat muscle. Abstract Text:

Torben Clausen,Ole Baekgaard Nielsen,Torben Clausen,Ole Baekgaard Nielsen,

During contractile activity, skeletal muscles undergo a net loss of cytoplasmic K(+) to the interstitial space. During intense exercise, plasma K(+) in human arterial blood may reach 8 mm, and interstitial K(+) 10-12 mm. This leads to depolarization, loss of excitability and contractile force. However, little is known about the effects of these physiological increases in extracellular K(+) ([K(+)](o)) on contractile endurance. Soleus muscles from 4-week-old rats were mounted on transducers for isometric contractions in Krebs-Ringer bicarbonate buffer containing 4-10 mm K(+), and endurance assessed by recording the rate of force decline during continuous stimulation at 60 Hz. Increasing [K(+)](o) from 4 to 8 or 10 mm and equilibrating the muscles for 40 or 20 min augmented the rate of force decline 2.4-fold and 7.2-fold, respectively (P < 0.001). The marked loss of endurance elicited by exposure to 8 or 10 mm K(+) was alleviated or significantly reduced by stimulating the Na(+),K(+)-pumps by intracellular Na(+) loading, the beta(2)-agonist salbutamol, adrenaline, calcitonin gene related peptide, insulin or repeated excitation. In conclusion, excitation-induced increase in [K(+)](o) is an important cause of high-frequency fatigue, and the Na(+),K(+)-pumps are essential for the maintenance of contractile force in the physiological range of [K(+)](o). Recordings of contractile force during continuous stimulation at 8-10 mm K(+) may be used to analyse the effects of agents or conditions influencing the excitability of working isolated muscles.

Potassium, Na+,K+-pumps and fatigue in rat muscle. Publishing Authors By Initials

T Clausen,OB Nielsen,T Clausen,OB Nielsen,

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Potassium, Na+,K+-pumps and fatigue in rat muscle. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: The Journal of physiology

VOLUME: 584

Page Numbers: 295-304

Journal Abbreviation: J. Physiol. (Lond.)

ISSN: 0022-3751

DAY: 2

MONTH: 08

YEAR: 2007

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LANGUAGE: eng

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Grant and Affiliation Information for Potassium, Na+,K+-pumps and fatigue in rat muscle.

AFFILIATION: Institute of Physiology and Biophysics, University of Aarhus, Ole Worms Allé 1160, DK-8000 Arhus C, Denmark. tc@fi.au.dk

Country: England

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MEDLINETA: J Physiol

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