Table 1.

Maximum values of the cross bicoherence of the PPG1 signal with respect to tri-axis acceleration data.

Dataset	x-axis				y-axis				z-axis
	${\mathit{f}}_1$ (Hz)	${\mathit{f}}_2$ (Hz)	Coherence		${\mathit{f}}_1$ (Hz)	${\mathit{f}}_2$ (Hz)	Coherence		${\mathit{f}}_1$ (Hz)	${\mathit{f}}_2$ (Hz)	Coherence
data 1	5.859	−2.808	0.562		4.395	−1.465	0.484		8.789	−5.859	0.556
data 2	2.808	−1.343	0.731		6.958	−5.493	0.722		2.808	−1.343	0.713
data 3	2.808	−1.343	0.577		2.808	−1.343	0.603		8.545	−7.080	0.578
data 4	4.639	−2.686	0.359		43.457	−41.138	0.396		43.579	0.000	0.854
data 5	49.927	0.610	0.687		5.615	−4.150	0.675		61.401	0.000	0.742
data 6	5.005	−3.784	0.654		5.005	−3.784	0.618		8.789	−7.568	0.613
data 7	5.127	−3.784	0.526		2.686	−1.343	0.485		2.564	−1.221	0.502
data 8	11.719	−8.789	0.720		60.913	0.000	0.857		7.324	−4.395	0.724
data 9	5.981	−4.883	0.574		2.319	−1.221	0.677		57.739	0.000	0.757
data 10	3.662	0.122	0.766		12.939	0.122	0.935		6.470	−0.366	0.912
data 11	4.517	−2.930	0.697		58.838	−0.122	0.919		7.446	−5.859	0.660
data12	4.517	−1.465	0.722		5.981	−2.930	0.697		59.204	0.000	0.766