Relationship between reduced lower abdominal blood flows and heart rate in recovery following cycling exercise

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Aim:To examine the blood flow (BF) response in the lower abdomen (LAB) in recovery following upright cycling exercise at three levels of relative maximum pulmonary oxygen consumption (Symbol) and the relationship of BFLAB to heart rate (HR) and target intensity.Methods:For 11 healthy subjects, BF (Doppler ultrasound) in the upper abdominal aorta (Ao) above the coeliac trunk and in the right femoral artery (RFA) was measured repeatedly for 720 s after the end of cycling exercises at target intensities of 30%, 50% and 85%Symbol, respectively. Blood flow in the lower abdomen (BFLAB) can be measured by subtracting bilateral BFFAs (≈twofolds of BFRFA) from BFAo. Change in BFLAB (or BFLAB volume) at any point was evaluated by difference between change in BFAo and in BFFAs. Heart rate and blood pressure were also measured.Results:At 85%Symbol, significant reduction in BFLAB by approx. 89% was shown at 90 s and remained until 360 s. At 50%Symbol, reduction in BFLAB by approx. 33% was found at 90 s although it returned to pre-exercise value at 120 s. On the contrary at 30%Symbol, BFLAB showed a light increase (<20%) below 70 bpm of HR. There was a close negative relationship (P < 0.05) between change in BFLAB and recovery HR, as well as between change in BFLAB volume and both recovery HR and %Symbol.Conclusion:This study suggests that the lower abdominal BF in recovery may be influenced by sympathetic-vagus control, and dynamics of BFLAB may be closely related to the level of relative exercise intensities.

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