scholarly journals Differential blood flow responses of abdominal organs during low‐intensity cycling exercise in humans

2007 ◽  
Vol 21 (5) ◽  
Author(s):  
Masako Endo ◽  
Rie Suzuki ◽  
Naomi Nagahata ◽  
Akira Miura ◽  
Shunsaku Koga ◽  
...  
Keyword(s):  
Blood Flow ◽  
Cycling Exercise ◽  
Low Intensity ◽  
Abdominal Organs ◽  
Exercise In Humans

Differential arterial blood flow response of splanchnic and renal organs during low-intensity cycling exercise in women

2008 ◽  
Vol 294 (5) ◽  
pp. H2322-H2326 ◽  
Author(s):  
Masako Yamaoka Endo ◽  
Rie Suzuki ◽  
Naomi Nagahata ◽  
Naoyuki Hayashi ◽  
Akira Miura ◽  
...  
Keyword(s):  
Blood Flow ◽  
Resistance Index ◽  
Arterial Blood Flow ◽  
Cycling Exercise ◽  
Low Intensity ◽  
Flow Response ◽  
Arterial Blood ◽  
Abdominal Organs ◽  
The Right ◽  
Splenic Vessels

To investigate the regional hemodynamic responses of abdominal arteries at the onset of exercise and to focus on their transient responses, eight female subjects (21–30 yr) performed ergometer cycling exercise at 40 W for 4 min in a semi-supine position. Mean blood velocities (MBVs) in the right renal (RA), superior mesenteric (SMA), and splenic (SA) arteries were measured by pulsed echo-Doppler ultrasonography, with beat-by-beat measurements of heart rate (HR) and mean arterial pressure (MAP). The vascular resistance index (RI) of each artery was calculated from MBV/MAP. MAP (76 ± 9 to 83 ± 8 mmHg at 4 min) and HR (60 ± 7 to 101 ± 9 beats/min at 4 min) increased during exercise ( P < 0.05). The MBV of RA and SA rapidly decreased after the onset of exercise (30 s; −19 ± 5% and −19 ± 12%, respectively), reaching −27 ± 7% and −27 ± 15% at the end of exercise ( P < 0.05). RI did not change during the initial 30 s of exercise, reflecting a reduction in MAP, and increased toward the end of the exercise (+55 ± 21% and +59 ± 39%, respectively). In contrast, both the MBV and RI in the SMA remained constant throughout the exercise. The results indicate that, whereas the responses of renal and splenic vessels changed similarly throughout the protocol, the vascular response of SMA that mainly supplies blood to the intestinal tract was unchanged during exercise. We, therefore, conclude that low-intensity cycling exercise resulted in differential blood flow responses in arteries supplying the abdominal organs.

Blood Flow In The Inferior Vena Cava At The Onset Of Cycling Exercise In Humans

2009 ◽  
Vol 41 ◽  
pp. 6-7
Author(s):  
Yoshiyuki Fukuba ◽  
Rie Kogata ◽  
Masako Yamada ◽  
Akira Miura ◽  
Shunsaku Koga ◽  
...  
Keyword(s):  
Blood Flow ◽  
Inferior Vena Cava ◽  
Inferior Vena ◽  
Vena Cava ◽  
Cycling Exercise ◽  
Exercise In Humans

Superior Mesenteric And Renal Artery Blood Flow During Low And Moderate Intensity Cycling Exercise In Humans

2009 ◽  
Vol 41 ◽  
pp. 6
Author(s):  
Masako Yamada ◽  
Masako Y. Endo ◽  
Nozoe Matsuda ◽  
Akira Miura ◽  
Shunsaku Koga ◽  
...  
Keyword(s):  
Blood Flow ◽  
Renal Artery ◽  
Moderate Intensity ◽  
Artery Blood Flow ◽  
Cycling Exercise ◽  
Exercise In Humans

Neural control of the forearm cutaneous vasoconstrictor response to dynamic exercise

1991 ◽  
Vol 71 (5) ◽  
pp. 1892-1896 ◽  
Author(s):  
D. B. Friedman ◽  
J. M. Johnson ◽  
J. H. Mitchell ◽  
N. H. Secher
Keyword(s):  
Blood Flow ◽  
Skin Blood Flow ◽  
Perceived Exertion ◽  
Dynamic Exercise ◽  
Rating Of Perceived Exertion ◽  
Doppler Flowmetry ◽  
Low Intensity ◽  
Vasoconstrictor Response ◽  
Low Intensity Exercise ◽  
Exercise In Humans

This study was designed to evaluate the relative importance of intended effort (“central command”) and of the absolute intensity of dynamic exercise to the cutaneous vasoconstrictor response to the onset of exercise in humans. Skin blood flow (laser-Doppler flowmetry) was measured from the forearm in six healthy individuals during 3-min periods of high- and low-intensity exercise with and without partial neuromuscular blockade. Cutaneous vascular conductance (CVC) was calculated from the ratio of skin blood flow to mean arterial pressure and expressed as a percent change from rest. A rating of perceived exertion (RPE) was expressed as a subjective measure of intended effort. Under control conditions, CVC decreased by 22% (median; range 7–42%, P less than 0.05) during high-intensity exercise [218 (186–268) W; RPE 16 (14–19) exertion units]. In contrast, during control low-intensity exercise [106 (88–128) W; RPE 10 (9–14) exertion units], during low-level exercise with curare [77 (54–98) W; RPE 13 (11–16) exertion units], and during maximal exercise with curare [106 (88–124) W; RPE 19 (18–20) exertion units], CVC did not change significantly. These results suggest that factors related to the activity of the exercising muscle and its metabolism rather than intended effort determine the cutaneous vasoconstrictor response to the initiation of intense dynamic exercise in humans.

scholarly journals Brachial artery blood flow dynamics during sinusoidal leg cycling exercise in humans

2017 ◽  
Vol 5 (19) ◽  
pp. e13456 ◽  
Author(s):  
Yoshiyuki Fukuba ◽  
Masako Y Endo ◽  
Ayaka Kondo ◽  
Yuka Kikugawa ◽  
Kohei Miura ◽  
...  
Keyword(s):  
Blood Flow ◽  
Brachial Artery ◽  
Flow Dynamics ◽  
Artery Blood Flow ◽  
Cycling Exercise ◽  
Leg Cycling ◽  
Blood Flow Dynamics ◽  
Exercise In Humans

Contralateral training effects of low-intensity blood-flow restricted and high-intensity unilateral resistance training

2021 ◽  
Author(s):  
Goncalo V. Mendonca ◽  
Carolina Vila-Chã ◽  
Carolina Teodósio ◽  
André D. Goncalves ◽  
Sandro R. Freitas ◽  
...  
Keyword(s):  
Blood Flow ◽  
Resistance Training ◽  
High Intensity ◽  
Training Effects ◽  
Low Intensity

Optimal parameters of blood flow restriction and resistance training on quadriceps strength and cross-sectional area and pain in knee osteoarthritis

2021 ◽  
pp. 1-10
Author(s):  
Waleed S. Mahmoud ◽  
Ahmed Osailan ◽  
Ahmed S. Ahmed ◽  
Ragab K. Elnaggar ◽  
Nadia L. Radwan
Keyword(s):  
Blood Flow ◽  
Resistance Training ◽  
Knee Osteoarthritis ◽  
Quadriceps Strength ◽  
Sectional Area ◽  
Occlusion Pressure ◽  
Total Occlusion ◽  
Cross Sectional ◽  
Flow Restriction ◽  
Low Intensity

BACKGROUND: Knee osteoarthritis (KOA) is one of the most common chronic diseases impacting millions of elderly people. OBJECTIVES: The study compared the effects of two intensities of partial blood flow restriction (BFR) with low-intensity resistance training on quadriceps strength and cross-sectional area (CSA), and pain in people with knee osteoarthritis (PwKOA). METHODS: Thirty-five PwKOA, aged 50–65, participated. Quadriceps CSA was measured by ultrasonography, quadriceps strength – by isokinetic dynamometry and pain by VAS. These outcome variables were obtained at the beginning of the study and re-evaluated eight weeks after the intervention. RESULTS: An interaction effect was present for quadriceps CSA (P= 0.042) and quadriceps strength (P= 0.006), showing that using 70% of total occlusion pressure with 30% 1RM had a more significant effect. Knee pain improved significantly through the main effect of BFR (P< 0.001), and low-intensity resistance training (P= 0.011). Pain improved more at 70% of total occlusion pressure, with 30% of 1RM (2.5 ± 1.06) than 50% total occlusion pressure with 10% of 1RM (5.77 ± 1.46). CONCLUSION: A combination of 70% of total occlusion pressure with 30% 1RM could be beneficial in PwKOA in improving pain, and increasing the quadriceps strength. The changes in the quadriceps strength could be a predictor for knee pain.

Failure of prostaglandins to modulate the time course of blood flow during dynamic forearm exercise in humans

1996 ◽  
Vol 81 (4) ◽  
pp. 1516-1521 ◽  
Author(s):  
J. K. Shoemaker ◽  
H. L. Naylor ◽  
Z. I. Pozeg ◽  
R. L. Hughson
Keyword(s):  
Blood Flow ◽  
Brachial Artery ◽  
Time Course ◽  
Forearm Blood Flow ◽  
Voluntary Contraction ◽  
Double Blind ◽  
Rate Of Increase ◽  
Forearm Exercise ◽  
Blind Manner ◽  
Exercise In Humans

Shoemaker, J. K., H. L. Naylor, Z. I. Pozeg, and R. L. Hughson. Failure of prostaglandins to modulate the time course of blood flow during dynamic forearm exercise in humans. J. Appl. Physiol. 81(4): 1516–1521, 1996.—The time course and magnitude of increases in brachial artery mean blood velocity (MBV; pulsed Doppler), diameter ( D; echo Doppler), mean perfusion pressure (MPP; Finapres), shear rate (γ˙ = 8 ⋅ MBV/ D), and forearm blood flow (FBF = MBV ⋅ π r 2) were assessed to investigate the effect that prostaglandins (PGs) have on the hyperemic response on going from rest to rhythmic exercise in humans. While supine, eight healthy men performed 5 min of dynamic handgrip exercise by alternately raising and lowering a 4.4-kg weight (∼10% maximal voluntary contraction) with a work-to-rest cycle of 1:1 (s/s). When the exercise was performed with the arm positioned below the heart, the rate of increase in MBV and γ˙ was faster compared with the same exercise performed above the heart. Ibuprofen (Ibu; 1,200 mg/day, to reduce PG-induced vasodilation) and placebo were administered orally for 2 days before two separate testing sessions in a double-blind manner. Resting heart rate was reduced in Ibu (52 ± 3 beats/min) compared with placebo (57 ± 3 beats/min) ( P < 0.05) without change to MPP. With placebo, D increased in both arm positions from ∼4.3 mm at rest to ∼4.5 mm at 5 min of exercise ( P < 0.05). This response was not altered with Ibu ( P > 0.05). Ibu did not alter the time course of MBV or forearm blood flow ( P > 0.05) in either arm position. The γ˙ was significantly greater in Ibu vs. placebo at 30 and 40 s of above the heart exercise and for all time points after 25 s of below the heart exercise ( P < 0.05). Because PG inhibition altered the time course ofγ˙ at the brachial artery, but not FBF, it was concluded that PGs are not essential in regulating the blood flow responses to dynamic exercise in humans.

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