Table 1.

Device brand, model, year, current status, wear location, and studies used for the current systematic review.

Brand	Model	Year	Status	Wear location	Studies
Apple	Watch	2015	Discontinued	Wrist	[20-40]
Apple	Watch Series 2	2016	Discontinued	Wrist	[41-44]
Fitbit	Alta	2016	Current model	Wrist	[45]
Fitbit	Blaze	2016	Discontinued	Wrist	[22,40,43]
Fitbit	Charge	2014	Discontinued	Wrist	[45-56]
Fitbit	Charge 2	2016	Discontinued	Wrist	[23,30,43,44,57-63]
Fitbit	Charge HR	2015	Discontinued	Wrist	[20,21,29,32,34,36,38,45,53,64-82]
Fitbit	Classic	2009	Discontinued	Ankle/foot or waist/hip	[83-87]
Fitbit	Flex	2013	Discontinued	Thigh or wrist	[45,50,72,79,80,88-117]
Fitbit	Flex 2	2017	Current model	Wrist	[113]
Fitbit	Force	2013	Discontinued	Wrist	[118,119]
Fitbit	One	2012	Discontinued	Ankle/foot, pant pocket, waist/hip, or wrist	[34,49,52,73,80,88,90,92,93,98,100,102,103,110, 116-118,120-138]
Fitbit	Surge	2015	Discontinued	Wrist	[27,35,42,45,54,82,139-143]
Fitbit	Ultra	2011	Discontinued	Chest, pant pocket, upper arm, waist/hip, or wrist	[85,144-148]
Fitbit	Zip	2012	Current model	Ankle/foot, pant pocket, shin, or waist/hip	[34,45,46,51,88,89,92,93,96,103,112,119,127,129, 131,141,149-161]
Garmin	Fenix 3 HR	2016	Discontinued	Wrist	[41]
Garmin	Forerunner 225	2015	Discontinued	Wrist	[21,162]
Garmin	Forerunner 235	2015	Current model	Wrist	[40,139,163]
Garmin	Forerunner 405CX	2009	Discontinued	Wrist	[164]
Garmin	Forerunner 735XT	2016	Current model	Wrist	[35]
Garmin	Forerunner 920XT	2014	Discontinued	Wrist	[53]
Garmin	Vivoactive	2015	Discontinued	Wrist	[53]
Garmin	Vivofit	2014	Discontinued	Wrist	[35,46,50,52,53,89,92,104,114,122,130,143,150,159, 165-169]
Garmin	Vivofit 2	2015	Discontinued	Wrist	[34,127,170]
Garmin	Vivofit 3	2016	Discontinued	Wrist	[168,171]
Garmin	Vivosmart	2014	Discontinued	Wrist	[32,53,75]
Garmin	Vivosmart HR	2015	Discontinued	Wrist	[36,43,65]
Garmin	Vivosmart HR+	2016	Current model	Wrist	[58,63,140]
Mio	Alpha	2013	Discontinued	Wrist	[25,38,71]
Mio	Fuse	2015	Discontinued	Wrist	[54,64]
Misfit	Flash	2015	Discontinued	Waist/hip	[32]
Misfit	Shine	2012	Discontinued	Ankle/foot, chest, pant pocket, waist/hip, or wrist	[74,79,89,96,99,104,105,131,159,169]
Polar	A300	2015	Discontinued	Wrist	[172]
Polar	A360	2015	Discontinued	Wrist	[25,43,140]
Polar	Active	2011	Discontinued	Wrist	[173]
Polar	Loop	2013	Discontinued	Wrist	[32,50,53,79,89,167]
Polar	M600	2016	Current	Wrist	[56]
Polar	V800	2016	Discontinued	Wrist	[174]
Samsung	Gear 2	2014	Discontinued	Wrist	[140]
Samsung	Gear S	2014	Discontinued	Wrist	[32,38]
Samsung	Gear S2	2015	Discontinued	Wrist	[35]
Samsung	Gear S3	2016	Discontinued	Wrist	[42,44]
Withings	Pulse	2013	Discontinued	Collar, pant pocket, waist/hip, or wrist	[89,96,131,166]
Withings	Pulse O2	2013	Discontinued	Collar, waist/hip, or wrist	[104,122,123,169,175]
Withings	Pulse Ox	2014	Current model	Waist/hip or wrist	[53,58]
Xiaomi	Mi Band	2014	Discontinued	Wrist	[42]
Xiaomi	Mi Band 2	2016	Discontinued	Wrist	[81]