Table 2.

Average heart rate (beats per minute) by exercise intensity per device.

Stage	Device	Mean	SD	Minimum	Maximum	Cohen's d
Start	Polar T31	72.32	12.20	46.67	106.00
	Fitbit Charge HR	73.08	10.44	55.00	102.33	0.07
	Apple Watch	72.84	12.08	43.00	108.00	0.04
	Garmin Forerunner 225	84.90	22.73	58.00	181.33	0.69
Baseline	Polar T31	72.99	11.30	45.00	103.83
	Fitbit Charge HR	71.36	10.74	47.67	103.33	−0.15
	Apple Watch	73.07	11.45	45.00	105.17	0.01
	Garmin Forerunner 225	80.32	18.38	56.33	169.33	0.48
Light intensity	Polar T31	92.45	13.66	72.00	139.00
	Fitbit Charge HR	103.11	17.45	73.67	179.33	0.68
	Apple Watch	89.19	11.94	65.00	117.67	−0.25
	Garmin Forerunner 225	108.31	25.69	73.67	166.67	0.77
Moderate intensity	Polar T31	106.84	16.44	78.00	152.00
	Fitbit Charge HR	110.06	16.71	78.67	162.00	0.19
	Apple Watch	101.01	16.48	68.00	133.00	−0.35
	Garmin Forerunner 225	126.50	23.40	85.33	184.33	0.97
Vigorous intensity	Polar T31	150.63	21.26	112.00	197.67
	Fitbit Charge HR	144.65	17.35	107.67	192.00	−0.31
	Apple Watch	150.87	19.17	112.00	194.67	0.01
	Garmin Forerunner 225	147.85	21.80	96.67	203.67	−0.13
Recovery	Polar T31	84.47	15.16	46.83	123.17
	Fitbit Charge HR	82.57	15.17	46.83	119.83	−0.13
	Apple Watch	84.02	15.27	45.17	119.83	−0.03
	Garmin Forerunner 225	87.23	12.48	60.50	120.67	0.20