Fig. 3.

ECGs from young and aging mice fed with standard laboratory chow (LC) or surplus ω-6 intake subjected to dobutamine stress. A: ECG measurement displaying the change in the increase in the PR interval. B: a bar graph showing heart rate, QT interval, ST height, and Q amplitude of baseline and dobutamine-stressed mice. C: waterfall plots displaying changes in ECG traces from 0 to 5 min after dobutamine injection. ECGs were recorded after acclimatizing mice on the acquisition platform for 5 min at room temperature. Values are means ± SE; n = 8 mice/group. *P < 0.05 vs. the young-LC group; $P < 0.05 vs. the aging-LC group; ns, not significant as analyzed by two-way ANOVA.