Training increases the concentration of [3H]ouabain-binding sites in rat skeletal muscle
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Training increases the concentration of [3H]ouabain-binding sites in rat skeletal muscle. / Kjeldsen, K; Richter, Erik A.; Galbo, H; Lortie, G; Clausen, T.
In: Biochimica et Biophysica Acta - General Subjects, Vol. 860, No. 3, 1986, p. 708-712.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Training increases the concentration of [3H]ouabain-binding sites in rat skeletal muscle
AU - Kjeldsen, K
AU - Richter, Erik A.
AU - Galbo, H
AU - Lortie, G
AU - Clausen, T
PY - 1986
Y1 - 1986
N2 - Exercise is associated with a net loss of K+ from the working muscles and an increased plasma K+ concentration, indicating that the capacity for intracellular reaccumulation of K+ is exceeded. Training reduces the exercise-induced rise in plasma K+, and an increased plasma [K+] may interfere with physical performance. Since the clearing of K+ from the extracellular space depends on the capacity for active K+ uptake in skeletal muscle, the effects of training and inactivity on the total concentration of (Na+ + K+)-ATPase was determined. Following 6 weeks of swim training, the concentration of [3H]ouabain-binding sites in rat hindlimb muscles was up to 46% (P less than 0.001) higher than in those obtained from age-matched controls. Whereas muscle Na+, K+ contents remained unchanged, the concentration of citrate synthase increased by up to 76% (P less than 0.001). Training induced no change in the [3H]ouabain-binding-site concentration in the diaphragm, but in the heart ventricles, the K+-dependent 3-O-methylfluorescein phosphatase activity increased by 20% (P less than 0.001). Muscle inactivity induced by denervation, plaster immobilisation or tenotomy reduced the [3H]ouabain-binding-site concentration by 20-30% (P less than 0.02-0.001) within 1 week. In conclusion, training leads to a significant and reversible rise in the concentration of (Na+ + K+)-ATPase in muscle cells. This may be of importance for the beneficial effects on physical performance by improving the maximum capacity for K+ clearance.
AB - Exercise is associated with a net loss of K+ from the working muscles and an increased plasma K+ concentration, indicating that the capacity for intracellular reaccumulation of K+ is exceeded. Training reduces the exercise-induced rise in plasma K+, and an increased plasma [K+] may interfere with physical performance. Since the clearing of K+ from the extracellular space depends on the capacity for active K+ uptake in skeletal muscle, the effects of training and inactivity on the total concentration of (Na+ + K+)-ATPase was determined. Following 6 weeks of swim training, the concentration of [3H]ouabain-binding sites in rat hindlimb muscles was up to 46% (P less than 0.001) higher than in those obtained from age-matched controls. Whereas muscle Na+, K+ contents remained unchanged, the concentration of citrate synthase increased by up to 76% (P less than 0.001). Training induced no change in the [3H]ouabain-binding-site concentration in the diaphragm, but in the heart ventricles, the K+-dependent 3-O-methylfluorescein phosphatase activity increased by 20% (P less than 0.001). Muscle inactivity induced by denervation, plaster immobilisation or tenotomy reduced the [3H]ouabain-binding-site concentration by 20-30% (P less than 0.02-0.001) within 1 week. In conclusion, training leads to a significant and reversible rise in the concentration of (Na+ + K+)-ATPase in muscle cells. This may be of importance for the beneficial effects on physical performance by improving the maximum capacity for K+ clearance.
KW - Animals
KW - Female
KW - Muscles
KW - Ouabain
KW - Physical Exertion
KW - Potassium
KW - Rats
KW - Rats, Inbred Strains
KW - Receptors, Drug
KW - Sodium-Potassium-Exchanging ATPase
M3 - Journal article
C2 - 3017429
VL - 860
SP - 708
EP - 712
JO - B B A - General Subjects
JF - B B A - General Subjects
SN - 0304-4165
IS - 3
ER -
ID: 154758076