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Mean absolute percent error of duration measures by device and activity.
| Activity type | Device | |||
|
|
Fitbit | Garmin Vívosmart HR | ||
|
|
Flex 2 | Charge 2 | Alta HR |
|
| Treadmill walk | 7.9 | 7 | 7.6 | 7.7 |
| Treadmill run | 139.4 | 115.4 | 144.8 | 8.7 |
| Embedded run | 23.6 | 24.8 | 28.9 | 23.9 |
| Outdoor walk | 8.1 | 6.9 | 4.9 | 11.8 |
| Outdoor run | 6.6 | 5.6 | 5.6 | 9.6 |
| Elliptical | 9.7 | 10.2 | 10.2 | 13 |
| Bike | 13.3 | 9.5 | 12.9 | 17.7 |
| Swim | 26.9 | —a | — | — |
aNo data acquired as Only the Fitbit Flex 2 is waterproof and can measure swimming.
