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We all know that when we exert ourselves our heart rate increases.

大家都知道，当我们竭尽全力时，心率会加速。

《柯林斯英汉双解大词典》

If a heart beats too slowly, the device will use electrical signals to help set a normal rate.

VOA: special.2010.06.29

The medulla, for instance, is responsible for heart rate and respiration.

比如,延脑负责心率与呼吸

耶鲁公开课 - 心理学导论课程节选

And it is almost like being in love except what it really is is two shots of caffeinated espresso causing a rapid heart rate an increase in respiration, sweaty palms, but I don't realize--she doesn't realize that's what it is.

跟恋爱一样的感觉,其实什么都不是,而是双倍浓度的咖啡因,导致心跳加速,呼吸急促，掌心冒汗，但我没意识到--她没意识到那是什么。

耶鲁公开课 - 心理学导论课程节选

While there are many heart rate apps available, Inner Balance is monitoring heart rate variability (HRV) - a measurement of beat-to-beat changes that occur within heart rhythms and a sophisticated and highly sensitive observation of emotional fluctuations.

ENGADGET: HeartMath unveils Inner Balance iOS app and sensor for managing stress, clearing the mind

The heart rate measurement feature lets you monitor your resting heart rate and transmit all that to the Withings Health Mate mobile application via the built-in internet connection.

FORBES: French Connected Device Company Brings Smart Scales to CES

They quantify your stress level by calculating your heart rate and the minute variations in the time between each beat, a measurement known as heart rate variability (HRV), which has been used to gauge the likelihood of mortality after a heart attack and to help assess certain psychiatric conditions.

WSJ: Keep Calm and Carry a Gizmo