![11tegen11 on X: "I don't mean the obvious heart rate monitor we saw KJH wear. But something like this image shows, a GPS vest? http://t.co/DqWyBIq9CY" / X 11tegen11 on X: "I don't mean the obvious heart rate monitor we saw KJH wear. But something like this image shows, a GPS vest? http://t.co/DqWyBIq9CY" / X](https://pbs.twimg.com/media/CGwpF3RWQAAyeAy.jpg)
11tegen11 on X: "I don't mean the obvious heart rate monitor we saw KJH wear. But something like this image shows, a GPS vest? http://t.co/DqWyBIq9CY" / X
![Amazon.com : Polar H9 Heart Rate Sensor – ANT + / Bluetooth - Waterproof HR Monitor with Soft Chest Strap for Gym, Cycling, Running, Outdoor Sports : Sports & Outdoors Amazon.com : Polar H9 Heart Rate Sensor – ANT + / Bluetooth - Waterproof HR Monitor with Soft Chest Strap for Gym, Cycling, Running, Outdoor Sports : Sports & Outdoors](https://m.media-amazon.com/images/S/aplus-media/vc/b9f84985-c28f-42cb-b2be-6724c546777a.__CR0,0,300,300_PT0_SX300_V1___.jpg)
Amazon.com : Polar H9 Heart Rate Sensor – ANT + / Bluetooth - Waterproof HR Monitor with Soft Chest Strap for Gym, Cycling, Running, Outdoor Sports : Sports & Outdoors
![The Wearable Cardioverter Defibrillator: A Life (Vest) of Controversy - American College of Cardiology The Wearable Cardioverter Defibrillator: A Life (Vest) of Controversy - American College of Cardiology](https://www.acc.org//-/media/Non-Clinical/Images/2020/10/CARDIOLOGY/14/LifeVest-Body-HighRes-1200x800.jpg)
The Wearable Cardioverter Defibrillator: A Life (Vest) of Controversy - American College of Cardiology
GPS and heart-rate monitors are helping save Maryland college and high school athletes from injuries
![The Wearable Cardioverter Defibrillator: A Life (Vest) of Controversy - American College of Cardiology The Wearable Cardioverter Defibrillator: A Life (Vest) of Controversy - American College of Cardiology](https://www.acc.org//-/media/Non-Clinical/Images/2020/10/CARDIOLOGY/14/Floating-LifeVest-HighRes-1200x800.jpg)