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Heart Rate spike after bike

Hi, training for Duthalons for about 18 months, now in the last couple of months my heart climbs during at the start of my final run after cycling, Average HR first run 149, during cycle 144 then at the at the start of 2nd run it goes quickly from 150 to 185 to 190, then after 10 min it drops back to 155. I am 53, 5'11'' , 79 kgs. I feel fine but a bit concerned, any comments or suggestions

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