Abstract
Reduction of systemic arterial compliance (SAC) with aging increases left ventricular afterload. The present study was designed to examine whether age-related reduction of SAC is related to excessive myocardial oxygen consumption during sub-maximal aerobic exercise. We studied elderly (60–69 years; n=25) and senior (70–82 years; n=25) subjects. We measured SAC immediately before the start of the ramp-fashion exercise (i.e., at the end of the 20 W warm-up exercise) and the double product (DP: systolic blood pressure × heart rate) during the ramp-fashion exercise (20–50 W). SAC was significantly lower in senior subjects (0.76±0.25 ml mmHg−1 m−2) compared with elderly subjects (0.95±0.22 ml mmHg−1 m−2). DP was higher in senior subjects (20 W: 14.3±3.1; 30 W: 15.9±4.2; 40 W: 17.7±4.9; 50 W: 20.6±5.6 [×103 mmHg bpm]) than in elderly subjects (12.8±3.0, 14.0±3.5, 15.1±4.0, 17.1±4.3 [×103 mmHg bpm]). In total subjects, SAC correlated significantly with DP (r=−0.64, r=−0.64, r=−0.64, r=−0.64). In senior subjects, SAC was related significantly to DP (r=−0.83, r=−0.78, r=−0.76, r=−0.74). In elderly subjects, SAC tended to correlate with DP although its relationships were not statistically significant (r=−0.34, r=−0.36, r=−0.33, r=−0.31). Correlation coefficients at each respective exercise intensity were significantly higher in senior subjects compared with elderly subjects. These results suggest that the age-related reduction of SAC is related to excessive myocardial oxygen consumption during sub-maximal aerobic exercise in older humans, but this relation does not become significant until the SAC reduction becomes pronounced.
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Otsuki, T., Maeda, S., Kesen, Y. et al. Age-Related Reduction of Systemic Arterial Compliance Induces Excessive Myocardial Oxygen Consumption during Sub-Maximal Exercise. Hypertens Res 29, 65–73 (2006). https://doi.org/10.1291/hypres.29.65
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DOI: https://doi.org/10.1291/hypres.29.65
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