Key result
Post-exercise hypotension after cycling linked to a ~23% increase in total vascular conductance across limbs.
Why the study?
Does a single period of cycling at 60% of HR reserve for 60 minutes alter regional vascular conductance in the legs, arms, kidneys, and viscera during post-exercise hypotension?
Observational (n=8)
No
Does a single period of cycling at 60% of HR reserve for 60 minutes alter regional vascular conductance in the legs, arms, kidneys, and viscera during post-exercise hypotension?
Effect estimate: 23% increase
Absolute Event Rate: 70.9% vs 57.6%
p-value: p=<0.05
Post-exercise hypotension is driven by increased total vascular conductance, primarily due to increased vascular conductance in both active and inactive limbs rather than the abdomen.
Limb vasodilation primarily mediates post-exercise hypotension after prolonged cycling; hypothesis-generating and requires confirmation before clinical application.
BACKGROUND: Post-exercise hypotension (PEH) following prolonged dynamic exercise arises from increased total vascular conductance (TVC) via skeletal muscle vasodilation. However, arterial vasodilation of skeletal musculatures does not entirely account for the rise in TVC. The aim of the present study was to determine the contribution of vascular conductance (VC) of the legs, arms, kidneys and viscera to TVC during PEH. METHODS: Eight subjects performed a single period of cycling at 60% of heart rate (HR) reserve for 60 minutes. Blood flow in the right renal, superior mesenteric, right brachial and right femoral arteries was measured by Doppler ultrasonography in a supine position before exercise and during recovery. HR and mean arterial pressure (MAP) were measured continuously. MAP decreased significantly from approximately 25 minutes after exercise cessation compared with pre-exercise baseline. TVC significantly increased (approximately 23%; P <0.05) after exercise compared with baseline, which resulted from increased VC in the leg (approximately 33%) and arm (approximately 20%), but not in the abdomen. CONCLUSION: PEH was not induced by decreased cardiac output, but by increased TVC, two-thirds of the rise in which can be attributed to increased VC in active and inactive limbs.
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Endo et al. (2012) conducted an observational in Healthy, normotensive volunteers (n=8). Upright cycling exercise vs. Pre-exercise baseline was evaluated on Total vascular conductance (TVC) at 15 to 30 minutes post-exercise (23% increase, p=<0.05). Post-exercise hypotension following 60 minutes of cycling was driven by an approximately 23% increase in total vascular conductance, with two-thirds of this rise attributed to increased vascular conductance in active and inactive limbs.
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