Table 2.

Comparison between patient (n=11) vessel flow waveforms during resting breath holding and free breathing, and exercise

		Ao	DAo	IVC	SVC
Ratio of inspiration to expiration flow rates (Qinsp/Qexpr)	FB	1.1±0.1	1.2±0.3	1.6±0.5*	1.9±0.6*
	Exercise	0.9±0.2	1.0±0.3	1.8±0.5*	2.6±2.0*
General pulsatility ndex (PI)	BH	510±155	569±202	123±72	204±116
	FB	454±116	589±303	231±120*	264±160
	Exercise	430±113	357±157*†	259±98*	320±174
Respiratory phasicity index (PIresp)	BH	72±56	62±35	36±38	49±25
	FB	67±56	52±30	120±59*	134±69*
	Exercise	53±28	75±37	119±48*	166±73*

^*p<0.05 in comparison with the breath holding condition;

^†p<0.05 in comparison between resting FB and exercise conditions;