Effects of Dietary Nitrates on Systemic and Cerebrovascular Hemodynamics

Table 4

Effects of beetroot juice treatment on TCD pulsatility and resistance.

Variable	Control	Beetroot juice
	Pulsatility index
Baseline rest	0.75±.04	0.71±.03
40% VO2peak	0.93±.05	0.87±.04
60% VO2peak	0.93±.03	0.94±.03
80% VO2peak	1.06±.07	1.08±.05
	Resistance index
Baseline rest	0.49±.01	0.47±.01
40% VO2peak	0.56±.02	0.54±.01
60% VO2peak	0.57±.01	0.56±.01
80% VO2peak	0.60±.02	0.60±.01

Values expressed in mean ± standard error of pulsatility and resistance indexes measured by transcranial doppler (TCD) ultrasonography at rest and at constant aerobic exercise workloads corresponding to 40%, 60%, and 80% of subject’s predetermined peak oxygen consumption (VO_2peak).