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Arturo Figueroa, Tracy Baynard, Bo Fernhall, Robert Carhart, Jill A Kanaley, Impaired postexercise cardiovascular autonomic modulation in middle-aged women with type 2 diabetes, European journal of cardiovascular prevention and rehabilitation, Volume 14, Issue 2, 1 April 2007, Pages 237–243, https://doi.org/10.1097/HJR.0b013e32801da10d
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Abstract
Type 2 diabetes is associated with cardiovascular autonomic dysfunction. Postexercise autonomic modulation may be different in obese individuals with and without type 2 diabetes. We examined postexercise responses in nondiabetic and diabetic women aged 40–60 years.
Hemodynamics, high-frequency and low-frequency of RR interval, low-frequency of systolic blood pressure variability and baroreflex sensitivity were evaluated before and after a 20 min walk at ~65% of VO2 peak in eight lean, 12 obese without type 2 diabetes and eight women with type 2 diabetes. Postexercise measurements were obtained at 10–15, 20–25 and 30–35 min.
Systolic blood pressure decreased at 10 (P<0.001) and 20 min (P<0.01) in all groups. Total peripheral resistance decreased at 10 min in all women, but the subsequent increase at 20 min was greater (P<0.01) in lean than in diabetic women. Log-transformed low-frequency of systolic blood pressure increased (P<0.01) at 10 and 20 min in all women, but the increase at 10 min was smaller (P<0.05) in diabetic than in lean women. Heart rate was increased (P<0.001) at 10 min in all women and at 20 min in both obese groups. Both log-transformed high-frequency of RR interval and baroreflex sensitivity decreased at 10 and 20 min of recovery in all groups. A group-by-time interaction (P<0.05) was observed for heart rate and baroreflex sensitivity as a lower heart rate and higher baroreflex sensitivity were observed in lean women than in women with type 2 diabetes.
Reduced postexercise baroreflex sensitivity and responses to autonomic cardiovascular activity contribute to an attenuated recovery of heart rate and total peripheral resistance after brisk walking in middle-aged obese women with type 2 diabetes.
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