I’m building an iPhone app that aligns live heart-rate readings with a video recording. I’m looking for a supported way to receive a fresh AirPods Pro 3 BPM estimate about once per second during an active session. I tested with an iPhone 16 running iOS 27.2 and AirPods Pro 3. A minimal test app starts an HKWorkoutSession on the iPhone, collects heart rate with HKLiveWorkoutBuilder, and records the source timestamp of each distinct reading. With both .other / .indoor and .running / .outdoor, the median spacing between readings was about five seconds. Querying HealthKit afterward returned the same in-take readings. Is that cadence expected for third-party apps? Is there a documented API, workout configuration, or capability that Apple makes available to third-party developers for receiving fresh AirPods Pro 3 BPM estimates at about 1 Hz? My requirement is for a new estimate from the AirPods at that cadence. Polling more frequently or interpolating between readings would not meet it.