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- W115989438 abstract "The isometric force-frequency relationship of isolated rat ventricular trabeculae (diameter <250 μm) was examined at 24, 30, and 37°C at stimulation frequencies (0.1–12 Hz) encompassing the physiological range. Some muscles were microinjected with fura PE3 to monitor the diastolic and systolic intracellular concentration of Ca 2+ ([Ca 2+ ] i ). At a near-physiological external Ca 2+ concentration ([Ca 2+ ] o ) of 1 mM, a positive force-frequency relationship was demonstrated at all temperatures. The force-frequency relationship became negative at high frequencies (e.g., >6 Hz at 30°C) at 1 mM [Ca 2+ ] o or at low frequencies at 8 mM [Ca 2+ ] o . The twitch and Ca 2+ transient became shorter as stimulation frequency increased; these changes were related to changes in systolic, rather than diastolic, [Ca 2+ ] i and were not blocked by inhibitors of Ca 2+ /calmodulin-dependent protein kinase II. The positive force-frequency relationship of rat trabeculae was caused by a frequency-dependent loading of the sarcoplasmic reticulum (SR) with Ca 2+ . We suggest that at high frequencies, or under conditions of Ca 2+ overload, this loading saturates. Processes that tend to decrease SR Ca 2+ release will then predominate, resulting in a negative force-frequency relationship." @default.
- W115989438 created "2016-06-24" @default.
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- W115989438 date "1999-01-01" @default.
- W115989438 modified "2023-09-27" @default.
- W115989438 title "Positive force- and [Ca<sup>2+</sup>]<sub>i</sub>-frequency relationships in rat ventricular trabeculae at physiological frequencies" @default.
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- W115989438 doi "https://doi.org/10.1152/ajpheart.1999.276.1.h9" @default.
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