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Randomized Controlled Trial
. 2017 Jul;49(7):1404-1411.
doi: 10.1249/MSS.0000000000001229.

All-Extremity Exercise Training Improves Arterial Stiffness in Older Adults

Han-Kyul Kim  1 , Chueh-Lung Hwang, Jeung-Ki Yoo, Moon-Hyon Hwang, Eileen M Handberg, John W Petersen, Wilmer W Nichols, Sofia Sofianos, Demetra D Christou
Affiliations
Randomized Controlled Trial

All-Extremity Exercise Training Improves Arterial Stiffness in Older Adults

Han-Kyul Kim et al. Med Sci Sports Exerc. 2017 Jul.

Abstract

Large elastic arteries stiffen with age, which predisposes older adults to increased risk for cardiovascular disease. Aerobic exercise training is known to reduce the risk for cardiovascular disease, but the optimal exercise prescription for attenuating large elastic arterial stiffening in older adults is not known.

Purpose: The purpose of this randomized controlled trial was to compare the effect 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.

Methods: Forty-nine sedentary older adults (age = 64 ± 1 yr), free of overt major clinical disease, were randomized to HIIT (n = 17), MICT (n = 18), or nonexercise controls (CONT; n = 14). HIIT (4 × 4 min at 90% HRpeak interspersed with 3 × 3 min active recovery at 70% HRpeak) and isocaloric MICT (70% HRpeak) were performed on an all-extremity non-weight-bearing ergometer, 4 d·wk for 8 wk under supervision. Aortic (carotid to femoral PWV [cfPWV]) and common carotid artery compliance were assessed at pre- and postintervention.

Results: cfPWV improved by 0.5 m·s in MICT (P = 0.04) but did not significantly change in HIIT and CONT (P > 0.05). Carotid artery compliance improved by 0.03 mm·mm Hg in MICT (P = 0.001), but 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, HR, body weight, total and abdominal adiposity, blood lipids, or aerobic fitness.

Conclusion: All-extremity MICT, but not HIIT, improved central arterial stiffness in previously sedentary older adults free of major clinical disease. Our findings have important implications for aerobic exercise prescription in older adults.

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Conflict of interest statement

The authors declare no conflict of interest.

The results of the study are presented clearly, honestly, and without fabrication, falsification, or inappropriate data manipulation.

The results of the present investigation do not constitute endorsement by the American College of Sports Medicine.

Figures

FIGURE 1
FIGURE 1
Change in carotid artery compliance in response to the intervention. CONT, non-exercise controls; MICT, moderate-intensity continuous training; HIIT, high-intensity interval training. *P<0.05; post- vs. pre-intervention.
See this image and copyright information in PMC

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