Fitbit data has been used by US police investigating whether a 90-year-old murdered his stepdaughter.

日前，美国警方通过利用Fitbit手环的数据，调查了一名90岁的男子是否杀害了自己的继女。

The victim, Karen Navarra, 67, was found with a kitchen knife in her hand, suggesting she killed herself.

受害者凯伦·纳瓦拉，今年67岁，被发现的时候手中握着一把厨房用刀，营造出自杀的情景。

Anthony Aiello, who denies murder, told police he had visited her for 15 minutes to drop off pizza.

安东尼·艾洛否认了谋杀，他告诉警察自己是来看望纳瓦拉，在她家呆了15分钟，还给她带来了披萨。

But police say a fitness¹ tracker she was wearing showed a significant spike² in heart rate followed by a rapid slowdown at the time he was there.

但警方发现，纳瓦拉佩戴的健身追踪器显示，在艾洛在现场的那段时间，纳瓦拉的心率明显提高，然后又迅速下降。

According to a police statement obtained by USA Today, Ms Navarra's Fitbit Alta device showed a raised heart rate at about 15:20 local time, when video evidence suggested Mr Aiello's car was at her house.

根据《今日美国》获得的一份警方声明显示，当地时间15:20分，纳瓦拉的Fitbit智能手环显示她心跳加速，而视频证据显示，艾洛的车当时就停在纳瓦拉家。

It then recorded her heart rate slowing rapidly and stopping at 15:28, five minutes before he left.

在艾洛离开的五分钟前，Fitbit智能手环的记录显示她的心率迅速下降，并在15：28分完全停止。