Table 2. Voice guidance on exercise status, heart rate (HR) estimation and exercise intensity.
| Guidance | Status | Voice guidance |
|---|---|---|
| Exercise Status Guidance | To start exercise (warm-up stage) | It is time to do warm-up exercise. |
| To shift to the main exercise stage | It is time to do the main exercise. | |
| To shift to the rest stage | It is time to take a rest. | |
| To shift to the second main exercise stage | It is time to do the second main exercise. | |
| To shift to the cool-down stage | It is time to do cool-down exercise. | |
| HR Estimation Guidance | To estimate HR | Please place your fingertip on the camera to estimate your heart rate. |
| To detect motion artifact | Your measured pulse is of low quality. Please place your fingertip on the camera again. | |
| Automatic Exercise Intensity Guidance | To slow down (measured HR > THZ) | Your heart rate is high. Please slow down. |
| To maintain intensity (measured HR within THZ) | Your heart rate is within your target heart rate zone. Please maintain your pace. | |
| To speed up (measured HR < THZ) | Your heart rate is low. Please speed up. |
THZ, target heart rate zone