Abstract
A decrease in systemic arterial compliance (SAC) increases left ventricular load along with the demand for excessive myocardial oxygen consumption when the age-related reduction of SAC reaches a marked level, and consequently may depress left ventricular pump function. Reduced left ventricular pump function decreases aerobic capacity, and some study groups have shown that SAC and/or central arterial distensibility is correlated with maximal aerobic capacity in humans. We thus hypothesize that, once the age-related reduction of SAC reaches a marked level, the participation of SAC in aerobic capacity will be significant even during sub-maximal exercise. Thirty young humans and 46 elderly humans participated in this study. SAC, oxygen uptake at the ventilatory threshold (V̇ O2 VT), and the ratio of increase in oxygen uptake, in cardiac output, and in effective arterial elastance to increase in work rate (ΔV̇ O2/ΔWR, ΔCO/ΔWR and ΔEa/ΔWR) were measured. SAC was significantly higher in young subjects compared with elderly subjects, and was significantly related to V̇ O2 VT in elderly subjects. SAC also significantly correlated with ΔV̇ O2/ΔWR, ΔCO/ΔWR and ΔEa/ΔWR in elderly subjects. When total subjects were divided by the value of SAC into 6 groups, the V̇ O2 VT values in the 3 groups with lower SAC were significantly lower than those in the 3 groups with higher SAC, and gradually decreased with the reduction of SAC. There were no changes in V̇ O2 VT among the 3 groups with higher SAC. These results suggest that the participation of SAC in aerobic capacity is significant even during sub-maximal exercise in individuals who show a pronounced age-related reduction of SAC.
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Otsuki, T., Maeda, S., Sugawara, J. et al. Age-Related Reduction of Systemic Arterial Compliance Relates to Decreased Aerobic Capacity during Sub-Maximal Exercise. Hypertens Res 29, 759–765 (2006). https://doi.org/10.1291/hypres.29.759
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DOI: https://doi.org/10.1291/hypres.29.759
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