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• W2021657300 abstract "1. The effects of the calcium agonist, Bay K 8644, on the mechanical output of skeletal muscle were studied in frog semitendinosus fiber bundles and in whole sartorius muscles. 2. Low concentrations of Bay K 8644 (less than or equal to 1 microM) had no significant influence on isometric twitches. Concentrations between 5-20 microM increased peak tension by 28.6 +/- 2.9% while higher concentrations (greater than or equal to 50 microM) initially increased then depressed twitches by 70 +/- 3.5%. 3. 10 microM Bay K 8644 also increased peak tension developed during low frequency stimulation (i.e. less than or equal to 40 Hz), slightly depressed high frequency contractions (i.e. greater than or equal to 80 Hz) but did not reduce maximal tetanic tension which occurred at about 60 Hz. 4. Potentiation of twitches and low frequency tetani and depression of high frequency tetani by Bay K 8644 were partially antagonized by nifedipine (10 microM), low extracellular calcium and D-600 (5 microM). These conditions did not, however, block the depressant actions of greater than or equal to 50 microM Bay K 8644. 5. In skinned fibers, 10 microM Bay K 8644 had no effect on resting or maximal Ca2+ activated tension. Also, 10 microM Bay K 8644 had no effect on caffeine contractures when added to the previous Ca2+ loading solution. 6. These results suggest that Bay K 8644 has both positive and negative inotropic actions on isolated skeletal muscle, which are dependent on drug concentration and muscle activation pattern." @default.
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• W2021657300 date "1991-01-01" @default.
• W2021657300 modified "2023-09-27" @default.
• W2021657300 title "Effects of the calcium channel agonist, Bay K 8644, on the mechanical output of skeletal muscle fibers" @default.
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• W2021657300 doi "https://doi.org/10.1016/0306-3623(91)90088-n" @default.
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