Large Artery Remodeling and Dynamics following Simulated Microgravity by Prolonged Head-Down Tilt Bed Rest in Humans

Table 2

Common carotid artery and common femoral artery structure, stiffness, and flow before and after HDTBR in 10 healthy volunteers.

	CCA			CFA
	Before	After		Before	After
IMT (μm)			0.27			0.58
Diameter minimum (mm)			0.12			<0.01
Diameter maximum (mm)			0.09			<0.01
Δ diameter (mm)			0.71			0.72
End-diastolic IMT/radius			0.14			<0.01
End-diastolic wall stress (kPa)			0.70			0.05
Beta index			0.29			0.20
Peak velocity systolic (cm/s)			0.83			0.09
Peak velocity diastolic (cm/s)			0.66			<0.05
Resistive index			0.88			0.05
Mean flow per beat (mL)			0.42			0.90
Systolic flow per beat (mL)			0.74			0.37
Diastolic flow per beat (mL)			0.08			0.05
Ratio syst/diast flow per beat			0.07			0.01
WSR peak near wall (s^−1)			0.29			0.89
WSR peak far wall (s^−1)			0.49			0.34

IMT: intima-media thickness; WSR: wall shear rate.