In:
Journal of Applied Physiology, American Physiological Society, Vol. 86, No. 2 ( 1999-02-01), p. 709-719
Abstract:
The redistribution of blood flow (BF) in the abdominal viscera during right-legged knee extension-flexion exercise at very low intensity [peak heart rate (HR), 76 beats/min] was examined by using Doppler ultrasound. While sitting, subjects performed a right-legged knee extension-flexion exercise every 6 s for 20 min. BF was measured in the upper abdominal aorta (Ao), right common femoral artery (RCFA), and left common femoral artery (LCFA). Visceral BF (BF Vis ) was determined by the equation [BF Ao − (BF RCFA + BF LCFA )]. A comparison with the change in BF (ΔBF) preexercise showed a greater increase in ΔBF RCFA than in ΔBF Ao during exercise. This resulted in a reduction of BF Vis to 56% of its preexercise value or a decrease in flow by 1,147 ± 293 (±SE) ml/min at the peak workload. Oxygen consumption correlated positively with ΔBF Ao , ΔBF RCFA , and ΔBF LCFA but inversely with ΔBF Vis during exercise and recovery. Furthermore, BF Vis (% of preexercise value) correlated inversely with both an increase in HR ( r = −0.89), and percent peak oxygen consumption ( r = −0.99). This study demonstrated that, even during very-low-intensity exercise (HR 〈 90 beats/min), there was a significant shift in BF from the viscera to the exercising muscles.
Type of Medium:
Online Resource
ISSN:
8750-7587
,
1522-1601
DOI:
10.1152/jappl.1999.86.2.709
Language:
English
Publisher:
American Physiological Society
Publication Date:
1999
detail.hit.zdb_id:
1404365-8
SSG:
12
SSG:
31
