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# Movement disorder algorithm changelog

A chronological log of notable changes to the movement disorder algorithm.

## Discussion

The movement disorder algorithm measures and records tremors and dyskinetic symptoms for Parkinson’s disease. For more information on receiving and using this data, see [Getting movement disorder symptom data](/documentation/CoreMotion/getting-movement-disorder-symptom-data).

### Unreleased

- The [`version()`](/documentation/CoreMotion/CMMovementDisorderManager/version()) method for checking the algorithm’s current version is available in watchOS 9.

### 1.0.0 — 2018-07-17

#### Added

- Released the algorithm used in watchOS 5 and later.

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