---
title: HKHeartRateRecoveryTestType.predictionSubMaxExercise
framework: healthkit
role: symbol
role_heading: Case
path: healthkit/hkheartraterecoverytesttype/predictionsubmaxexercise
---

# HKHeartRateRecoveryTestType.predictionSubMaxExercise

A test that estimates a person’s heart-rate recovery using lower-intensity exercise.

## Declaration

```swift
case predictionSubMaxExercise
```

## Discussion

Discussion In this test, a person performs lower-intensity exercise, staying below their physical limit. The test then estimates their actual heart rate recovery based on the difference between their exercising heart rate, and the rate of recovery after the exercise ends.

## See Also

### Heart-rate recovery tests

- [HKHeartRateRecoveryTestType.maxExercise](healthkit/hkheartraterecoverytesttype/maxexercise.md)
- [HKHeartRateRecoveryTestType.predictionNonExercise](healthkit/hkheartraterecoverytesttype/predictionnonexercise.md)