Fig. 5. (A) Relationships between the delay separating the electrocardiogram (ECG) in the middle of the right ventricle from that in the cog-wheel valve muscle and heart rate (open circles) and between the phase of the cog-wheel muscle ECG and heart rate (filled circles): delay versus heart rate was not significant (P=0.24); phase versus heart rate slope=0.67 (P<0.001, r²=0.63). (B) Relationship between phase and the delay between the right ventricle and cog-wheel valve muscle ECGs: slope=0.069 (P<0.001, r²=0.58).