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https://www.mdlinx.com/internal-medicine/medical-news-article/2017/02/10/high-intensity-interval-training-aortic-pulse/7047855/?
Medicine and Science in Sports and Exercise, 02/10/2017
This
study was conducted to compare the impact of all–extremity
high–intensity interval training (HIIT) and moderate–intensity
continuous training (MICT) on aortic pulse wave velocity (PWV) and
carotid artery compliance in older adults. The following findings were
revealed, all–extremity MICT but not HIIT, improved central arterial
stiffness in previously sedentary older adults free of major clinical
disease. The conclusion derived has significant implications for aerobic
exercise prescription in older adults.
Methods
- Forty-nine sedentary older adults (age: 64±1 years), free of overt major clinical disease, were randomized to HIIT (n=17), MICT (n=18) or non-exercise controls (CONT; n=14).
- HIIT (4x4 minutes at 90% of peak heart rate interspersed with 3x3 minutes active recovery at 70% of peak heart rate) and isocaloric MICT (70% of peak heart rate) were conducted on an all-extremity non-weight-bearing ergometer, 4 days/week, for 8 weeks under supervision.
- Aortic (carotid to femoral; cfPWV) and common carotid artery compliance were evaluated at pre- and post-intervention.
Results
- cfPWV improved by 0.5 m/sec in MICT (P=0.04) but did not significantly alter in HIIT and CONT (P>0.05).
- Carotid artery compliance improved by 0.03 mm2/mmHg in MICT (P=0.001), while it remained unchanged in HIIT and CONT (P>0.05).
- Improvements in arterial stiffness in response to MICT were not confounded by changes in aortic or brachial blood pressure, heart rate, body weight, total and abdominal adiposity, blood lipids or aerobic fitness.
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