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Erschienen in:
01.05.2015 | Original Article
Acute effect of high-intensity cycling exercise on carotid artery hemodynamic pulsatility
Erschienen in: European Journal of Applied Physiology | Ausgabe 5/2015
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Purpose
Investigate the effects of acute high-intensity exercise on common carotid artery (CCA) dimensions, stiffness, and wave intensity.
Methods
Fifty-five healthy men and women (22 ± 5 year; 24.5 ± 2.7 kg m−2) underwent 30 s of high-intensity cycling (HIC; Wingate anaerobic test). CCA diameter, stiffness [β-stiffness, Elastic Modulus (E
p)], pulsatility index (PI), forward wave intensities [due to LV contraction (W
1) and LV suction (W
2)], and reflected wave intensity [negative area (NA)] were assessed using a combination of Doppler ultrasound, wave intensity analysis, and applanation tonometry at baseline and immediately post-HIC.
Results
CCA β-stiffness, E
p, PI and pulse pressure increased significantly immediately post-HIC (p < 0.05). CCA diameter decreased acutely post-HIC (p < 0.05). There were also significant increases in W
1 and NA and a significant decrease in W
2 (p < 0.05). A significant correlation was found between change in W
1 and PI (r = 0.438, p < 0.05), from rest to recovery as well as a significant inverse correlation between W
2 and PI (r = −0.378, p < 0.05). Change in PI was not associated with change in CCA stiffness or NA (p > 0.05).
Conclusions
Acute HIC results in CCA constriction and increases in CCA stiffness along with increases in hemodynamic pulsatility. The increase in pulsatility may be due to a combination of increased forward wave intensity from increased LV contractility into a smaller vessel (i.e. impaired matching of diameter and flow) coupled with reduced LV suction.