(Some use 110 to 150 bpm or 120 to 160 bpm.) Very early on – between 8 weeks and 10 weeks pregnant – the range is higher, between 150 and 170 bpm. But the rate doesn't stay the same.

During a race, most drivers had an average heart rate around 170 beats per minute -- higher than most other athletes -- with a peak of 190, Toyota said. Moreover, this season -- with traction ...