Heart rate recording
How can I change my watch so it does not record heart rate several times a minute
iPhone 11, iOS 15
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When you use the Workout app, Apple Watch measures your heart rate continuously during the workout and for 3 minutes after the workout ends to determine a workout recovery rate.
Apple Watch measures your heart rate throughout the day when you’re still, and periodically when you’re walking (Apple Watch Series 1 or later). Since Apple Watch takes these background readings based on your activity, the time between these measurements will vary.
To preserve your battery life on long walks and runs, you can use Power Saving Mode to turn off the Always On display, the heart rate sensor, and cellular data. Your Apple Watch still calculates active calories, distance, pace, and elapsed time.
For more info, see:
Monitor your heart rate with Apple Watch - Apple Support
Use the Workout app on your Apple Watch - Apple Support