研究人员通过记录日记以及使用步程计来测量每天走了多少步，以此来评估锻炼强度水平。
Physical activity levels were assessed using a diary and pedometer to measure the amount of footsteps taken each day.
新款 nano 依然带有内建的加速度计，虽然这次它只是用来实现步程计和“摇晃切歌”功能的。
The new nano continues to include a built-in accelerometer, although this time around it’s used only for the pedometer and the Shake To Shuffle feature.
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