Table 1.

. | SQ_{0.2Hz}
. | SQ_{physiol}
. | AP_{physiol}
. |
---|---|---|---|

7°C | 474±53^{a,e} | 662±65^{a,f} | 234±49^{a,g} |

14°C | 398±40^{a,e} | 506±48^{a,f} | 122±41^{b,g} |

21°C | 198±27^{b,e} | 278±41^{b,f} | 79±12^{b,g} |

. | SQ_{0.2Hz}
. | SQ_{physiol}
. | AP_{physiol}
. |
---|---|---|---|

7°C | 474±53^{a,e} | 662±65^{a,f} | 234±49^{a,g} |

14°C | 398±40^{a,e} | 506±48^{a,f} | 122±41^{b,g} |

21°C | 198±27^{b,e} | 278±41^{b,f} | 79±12^{b,g} |

The effect of temperature and the frequency/stimulus waveform on the amplitude of the stimulus-induced change in [Ca^{2+}]_{i},calculated as the difference between the diastolic and systolic Ca^{2+} concentration with each depolarization. Values are means of 4-8 cells at each temperature.

The frequency of stimulation during SQ_{physiol} (square pulses)and AP_{physiol} (action potential) was 0.6 Hz at 7°C, 1.0 Hz at 14°C and 1.4 Hz at 21°C.

The effect of temperature is indicated by dissimilar letters a, b and c(compare vertically within each frequency/stimulus treatment) [analysis of variance (ANOVA), Student—Newman—Keuls (SNK) test]. Dissimilar letters e, f and g indicate significant differences between frequency/stimulus protocols (compare horizontally within each temperature) [repeated measures ANOVA, SNK].

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