Why the study?
Does type 2 diabetes impair the dynamic response of leg vascular conductance during exercise compared to heavy and lean controls?
Does type 2 diabetes impair the dynamic response of leg vascular conductance during exercise compared to heavy and lean controls?
Type 2 diabetes is associated with a slowed hyperemic response in exercising limbs, which may contribute to exercise intolerance in these patients.
May link type 2 diabetes to exercise intolerance via slowed leg vascular conductance; hypothesis-generating and requires prospective validation.
In this study we tested the hypothesis that type 2 diabetes impairs the dynamic response of leg vascular conductance (LVC) during exercise. LVC (leg blood flow/mean arterial pressure) responses were studied during intermittent contractions of the calf muscle in subjects with type 2 diabetes (n = 9), heavy controls (n = 10) and lean controls (n = 8) using a biexponential function and an estimate of the mean response time (MRT). The time constant of the second phase of LVC was significantly greater in type 2 diabetes (66.4 ± 29.2 s) than the heavy (22.2 ± 13.4 s) and lean (21.8 ± 9.3 s) controls, resulting in a significantly greater MRT in the diabetic group (median [IQR] = 30.7 [24.6-46.5] s versus 16.3 [4.3-23.2] s and 18.4 [13.7-19.3] s). These data support the hypothesis and suggest that a slowed hyperaemic response in the exercising limb might contribute to exercise intolerance in diabetic subjects.
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Ananey et al. (2011) studied this question.
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