Alterations in the Blood Velocity Profile Influence the Blood Flow Response during Muscle Contractions and Relaxations

• Osada Takuya

  Department of Sports Medicine for Health Promotion, Tokyo Medical University The Copenhagen Muscle Research Centre, University of Copenhagen, Rigshospitalet

• Rådegran Göran

  The Copenhagen Muscle Research Centre, University of Copenhagen, Rigshospitalet Department of Cardiology, The Heart and Lung Division, Lund University Hospital

抄録

The present study examined the influences of the muscle contraction (MCP) and relaxation (MRP) phases, as well as systole and diastole, on the blood velocity profile and flow in the conduit artery at different dynamic muscle contraction forces. Eight healthy volunteers performed one-legged dynamic knee-extensor exercise at work rates of 5, 10, 20, 30, and 40 W at 60 contractions per minute. The time- and space-averaged, amplitude-weighted, mean (V_mean) and maximum (V_max) blood flow velocities were continuously measured in the common femoral artery during the cardiosystolic (CSP) and cardiodiastolic (CDP) phases during MCP and MRP, respectively. The V_max/V_mean ratio was used as a flow profile index where a ratio of approximately (∼) 1 indicates a “flat” velocity profile, and a ratio significantly greater than (>>) 1 indicates a “parabolic” velocity profile. At rest, a “steeper” parabolic velocity profile was found during the CDP (ratio: 1.75 ± 0.06) than during the CSP (ratio: 1.31 ± 0.02). During the MRP of exercise, the V_max/V_mean ratio shifted to be less steep (p < 0.05) than at rest during the CDP (ratio: 1.41–1.54) at 5, 10, 20, 30, and 40 W; whereas it was slightly higher (p < 0.05) at 30 and 40 W than at rest during the CSP (ratio: 1.43–1.46). During the MCP, the parabolic blood velocity profile was enhanced (p < 0.05) at higher contraction forces, 20 W during the CDP (ratio: 2.15–2.52) and 30 W during the CSP (ratio: 1.49–1.77), potentially because of a greater retrograde flow component. A higher blood flow furthermore appeared during the MRP compared to during the MCP, coinciding with a greater uniformity of the red blood cells moving at higher blood velocities during the MRP. Thus part of the difference in the magnitude of blood flow during the MRP vs. MCP may be due to the alterations of the blood velocity flow profile.<br>

収録刊行物

• The Journal of Physiological Sciences

  The Journal of Physiological Sciences 56 (3), 195-203, 2006

  一般社団法人　日本生理学会

キーワード

• rheological blood flow profile
• blood velocity
• exercise hyperemia
• Doppler ultrasound

詳細情報

• CRID: 1390001205252316800
• NII論文ID: 10020331485
• NII論文ID: 130004466845
• NII書誌ID: AA12129145
• DOI: 10.2170/physiolsci.rp002905
• COI: 1:STN:280:DC%2BD28rhsVOksA%3D%3D
• ISSN: 18806562
• ISSN: 18806546
• NDL書誌ID: 8046876
• PubMed: 16839453
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8046876
• Web Site: https://search.jamas.or.jp/link/ui/2007087760
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • PubMed
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可