Heart Rate Features. The Forerunner® 35 has a wrist-based heart rate monitor and is compatible with ANT‍+ ® heart rate monitors. You must have a heart rate monitor to use the features described in this section. Wearing the Device and Heart Rate. Viewing Your Heart Rate Data. Getting Your VO2 Max. Estimate for Running. About Heart Rate Zones. How often the forerunner 235 wrist heart rate measure your heart rate monitor? That during sleeping, awake at work sitting on a chair :) I know that when you are doing an activity it will be ON all the time but I found that RHR is far high than what I see with FitBit, probably because of Fitbit constantly reading your HR. Garmin heart rate monitors for swimming, running and, other activities. Golf Marathon Multisport & Triathlete Swimming Diving Water Sports Scales & Heart Rate Forerunner® 230/235 Owner's Manual. Broadcasting Heart Rate Data to Garmin Devices; Tips for Erratic Heart Rate Data; Caring for the Heart Rate Monitor; You can see a comparison between the Forerunner 405 with chest strap and the Forerunner 235. My old trusted companion which i have had for 6 years forrunner 405 shows 143 bpm and the forerrunner 235 showing at the same time 112bpm. A whoping 30 bpm difference. Really feeling like i was sold an unfinished product Garmin The 230 is a cheaper option than the newer 235 and an upgrade to an older Forerunner 220. It has a 60 percent battery life increase and a more prominent display. If the consumer can live without a built-in wrist-based heart rate monitor or has a Garmin chest strap, the 230 is an excellent choice. I recently purchased a forerunner 235 after having a vivosmart HR and i noticed an interesting anomaly with the watch. I like to disable the all day heart rate monitor to conserve battery and only turn it on during an activity or whenever i want it on however when I disable it on the phone, once it syncs the heart rate monitor turns on again. When paired with a heart rate monitor, Forerunner 620 can help gauge your fitness level through advanced Features like recovery advisor, race predictor and Vo2 Max estimate Buy it with This item: Garmin 010-N1128-01 Forerunner 620 Noh, White and Orange (Renewed) L72t.