The controller is the heart of smart home system, it can collect the system information, input the information, process logic, output information, linkage control, and so on.

家居控制器是智能家居的心脏，通过它可实现系统信息的采集、信息输入、逻辑处理、信息输出、联动控制等。

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Yes, there are other options like lactate testing, power output and pace, but all of these have certain shortcomings that make them less universally applicable than heart rate.

还有其它武器，比如乳酸根测试，功率输出和配速，但是，所有这些存在某些缺点，应用也不如心率那样广泛。

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Increases Cardiac Output, stronger heart contractions pump more blood, increased stroke volume, thickens left ventricle wall (more muscular), decreases hearts' oxygen requirements.

心输出量增加，心脏收缩加强能泵更多的血液，心搏量增加，左心室壁变厚(更多肌肉)，心脏对氧气的需要减少。

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Many athletes use Strava to rank their own performances over time, measuring not only speed and distance but also heart rate, power output and other information.

WSJ: The Last Place Lance Armstrong Can Race

The 400PT is a heavy monster that won't slide around the floor and it has cutting-edge electronics that measure heart rate, calorie burn and power output by the watt.

FORBES: Commentary

However, the uncertainty about the valuation of asset prices is arguably no greater than the uncertainty about potential growth rates and hence the size of the output gap, which is at the heart of most central banks' inflation forecasts.

ECONOMIST: Central banks, all a-quiver | The