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  • Title: Abnormal response to exercise in middle-aged NIDDM patients with and without autonomic neuropathy.
    Author: Radice M, Rocca A, Bedon E, Musacchio N, Morabito A, Segalini G.
    Journal: Diabet Med; 1996 Mar; 13(3):259-65. PubMed ID: 8689848.
    Abstract:
    The cardiovascular response to exercise in middle-aged non-insulin-dependent diabetes mellitus (NIDDM) patients and the potential role of clinical characteristics and autonomic function were evaluated. One hundred and eight NIDDM patients, aged 40-65 years, were compared with a control group of 112 subjects, matched by age, sex, physical fitness, and presence of hypertension. All subjects performed a maximal exercise test. The diabetic patients completed cardiovascular autonomic neuropathy (CAN) tests: deep breathing, postural hypotension and lying to standing. There were no significant differences in total work capacity, heart rate, and blood pressure, either at rest or at peak exercise between the two groups. Diabetic patients showed significantly lower values of systolic and diastolic blood pressure during exercise, significantly slower recovery of heart rate (at 5th minute the average values were 102.7 +/- 14.1 beats min-1 vs 91.9 +/- 11.1, p < 0.001); and significantly higher proportion of blunted increase of heart rate (9.2% vs 0.9%, p < 0.001) and systolic blood pressure (9.2% vs 0.7%, p < 0.001) during exercise. No correlation between the exercise results and the main clinical characteristic (presence of hypertension, BMI, duration of diabetes, treatment, microalbuminuria, total score of CAN) was observed. These findings suggest that the cardiovascular response to exercise could be impaired also in the absence of signs of CAN. This impairment was higher in patients showing a dysfunction of orthosympathetic activity.
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