Table 4.
Steady-state activation and inactivation parameters of Alaska blackfish ventricular cardiomyocytes at low (5°C) and high (15°C) acclimation temperatures and following acute exposure to 10°C.
| Treatment | Vh,act (mV) | kact (mV) | Vh,inact (mV) | kinact (mV) | N |
|---|---|---|---|---|---|
| 5°C-acclimated | −13.7±1.2 | 3.9±1.5 | −19.8±1.2b | 5.4±0.4 | 11 (8 fish) |
| 10°C acute from 5°C | −13.8±1.1 | 5.7±0.9 | −20.7±1.1 | 5.4±0.5 | 5 (4 fish) |
| 10°C acute from 15°C | −14.2±0.8 | 4.9±0.2 | −25.0±0.4*† | 4.9±0.1 | 5 (2 fish) |
| 15°C-acclimated | −14.1±0.8 | 5.8±0.7 | −23.3±1.0a | 4.6±0.1 | 9 (5 fish) |
Vh,act: half-activating potential; Vh,inact: half-inactivating potential; kact: the slope factor of activation; kinact: the slope factor of inactivation.
Dissimilar letters indicate a significant difference (P<0.05) between 15°C and 5°C acclimation groups (unpaired t-tests).
An asterisk (*) indicates a statistically significant effect (P<0.05) of acute exposure to 10°C from an acclimation temperature (paired t-tests).
A dagger (†) indicates a significant difference (P<0.05) between 15°C and 5°C acclimation groups after acute exposure to and recording at 10°C (unpaired t-tests).
Values are means ± S.E.M.