All-Extremity Exercise Training Improves Arterial Stiffness in Older Adults.
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.



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.



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.



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.



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.
1Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, FL; 2Division of Health and Exercise Science, Incheon National University, Incheon, KOREA; and 3Division of Cardiovascular Medicine, University of Florida, Gainesville, FL.
Han-Kyul
HK
Kim
Chueh-Lung
CL
Hwang
Jeung-Ki
JK
Yoo
Moon-Hyon
MH
Hwang
Eileen M
EM
Handberg
John W
JW
Petersen
Wilmer W
WW
Nichols
Sofia
S
Sofianos
Demetra D
DD
Christou
D000368:Aged; D000886:Anthropometry; D001011:Aorta / Q000502:physiology; D001794:Blood Pressure / Q000502:physiology; D002339:Carotid Arteries / Q000033:anatomy & histology / Q000502:physiology; D005260:Female; D006339:Heart Rate / Q000502:physiology; D000072696:High-Intensity Interval Training / Q000379:methods*; D006801:Humans; D008055:Lipids / Q000097:blood; D035002:Lower Extremity / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D063177:Pulse Wave Analysis; D034941:Upper Extremity / Q000502:physiology*; D059289:Vascular Stiffness / Q000502:physiology*
D008055:Lipids