Table 4.

Second-by-second reliability of heart rate obtained from three smart bras over various conditions (rest, warm up, run, walk, and over the entire period). Absolute reliability is represented as the coefficient of variation (CV), and test-retest reliability is presented as Intraclass correlations (ICC) with associated 95% confidence intervals (CI) and p-values.

Smart Bra	Condition	CV (%)	ICC	95% CI	p-value
Adidas	Rest	10.23	0.551	0.501 to 0.595	<0.001
	Warm Up	19.66	0.337	0.295 to 0.376	<0.001
	Run	24.12	0.155	0.114 to 0.194	<0.001
	Walk	20.65	0.438	0.411 to 0.464	<0.001
	All	20.92	0.447	0.432 to 0.463	<0.001
Berlei	Rest	4.91	0.930	0.923 to 0.937	<0.001
	Warm Up	4.04	0.969	0.967 to 0.971	<0.001
	Run	2.28	0.972	0.970 to 0.973	<0.001
	Walk	3.59	0.946	0.943 to 0.948	<0.001
	All	3.31	0.978	0.978 to 0.979	<0.001
Sensoria	Rest	5.50	0.921	0.912 to 0.929	<0.001
	Warm Up	9.98	0.582	0.556 to 0.608	<0.001
	Run	12.65	0.465	0.439 to 0.491	<0.001
	Walk	9.60	0.424	0.396 to 0.452	<0.001
	All	10.48	0.625	0.614 to 0.636	<0.001

Note: bold indicates having met the minimum established thresholds for each of the reliability tests.