![The validity of activity trackers is affected by walking speed: the criterion validity of Garmin Vivosmart® HR and StepWatch™ 3 for measuring steps at various walking speeds under controlled conditions [PeerJ] The validity of activity trackers is affected by walking speed: the criterion validity of Garmin Vivosmart® HR and StepWatch™ 3 for measuring steps at various walking speeds under controlled conditions [PeerJ]](https://dfzljdn9uc3pi.cloudfront.net/2020/9381/1/fig-1-full.png)
The validity of activity trackers is affected by walking speed: the criterion validity of Garmin Vivosmart® HR and StepWatch™ 3 for measuring steps at various walking speeds under controlled conditions [PeerJ]
![Garmin vivosmart® HR (Black - extra large fit) Water-resistant activity tracker with built-in heart rate monitor at Crutchfield Garmin vivosmart® HR (Black - extra large fit) Water-resistant activity tracker with built-in heart rate monitor at Crutchfield](https://images.crutchfieldonline.com/ImageHandler/trim/750/457/products/2015/44/150/g150VSHRBLX-F.jpg)
Garmin vivosmart® HR (Black - extra large fit) Water-resistant activity tracker with built-in heart rate monitor at Crutchfield
![Garmin vivosmart® HR+ (Midnight blue - regular fit) Water-resistant GPS activity tracker with built-in heart rate monitor at Crutchfield Garmin vivosmart® HR+ (Midnight blue - regular fit) Water-resistant GPS activity tracker with built-in heart rate monitor at Crutchfield](https://images.crutchfieldonline.com/ImageHandler/trim/750/457/products/2016/22/150/g150VSHRPMB-F.jpg)
Garmin vivosmart® HR+ (Midnight blue - regular fit) Water-resistant GPS activity tracker with built-in heart rate monitor at Crutchfield
![Garmin vivosmart® HR (Black - regular fit) Water-resistant activity tracker with built-in heart rate monitor at Crutchfield Garmin vivosmart® HR (Black - regular fit) Water-resistant activity tracker with built-in heart rate monitor at Crutchfield](https://images.crutchfieldonline.com/ImageHandler/trim/750/457/products/2015/44/150/g150VSHRBL-F.jpg)