THE EFFECT OF MUSCLE TENSION AND BODY POSITION ON LEG BLOOD FLOW

肌肉张力和身体姿势对腿部血流的影响

• 批准号: 13680041
• 负责人: MIURA Akira
• 金额: $ 1.41万
• 依托单位: Hiroshima Prefectural Women's University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13680041/
• 关键词: blood flow; exercise; perfusion pressure; muscle tension

The purpose of this study was to determine the effect of muscle tension (long vs short stroke length) on femoral artery blood flow during supine and upright knee extension exercise in humans.<In 2002>Six healthy subjects (22-46 years) participated in this study. The LT and critical power (CP) of the power-duration hyperbolic relation of knee extension exercise were estimated by standard procedures. Subjects performed 6 min square-wave knee extension exercise at three different WR in supine and upright position at 60 rpm. The WR were 40%LT, 80%LT, and LT-CP (halfway between the LT and CP). Mean blood velocity of the femoral artery was continuously measured and averaged second-by-second using Doppler sonography. Mean blood flow (MBF) was calculated by using the diameter of the femoral artery determined during exercise using echo ultrasound. Ventilatory and gas exchange responses, mean arterial pressure (MAP) at the level of the femoral artery, and heart rate (HR) were measured during exe … More rcise. Steady-state MBF, oxygen uptake, and HR increased linearly as functions of increasing WR. There were significant differences (P<0.05, by ANOVA) between each WR in steady-state MBF [rest, 568 ± 76 ; 40%LT, 1948 ± 210 ; 80%LT, 2958 ± 150 ; LT-CP, 3973 ± 303 ml/min, mean ± SE]. However, MBF during supine and upright position were similar at the same power output.<In 2003>Six healthy subjects (22-47 years) performed knee extension exercise under two conditions (supine short stroke, SS ; supine long stroke, SL). Stroke displacements were fixed at 10(short) and 20 (long) cm with the long stroke, only half the muscle tension would be required for each power out put compared to exercise with the short stroke. Each exercise consisted of 2 min rest, 5 min kicking, and 2 min recovery. 3 work rate stages ranging from 3 to 11 watts, which correlated with 5% of maximum voluntary contraction at the lowest intensity to 30% at the highest intensity, were performed for each condition. The contraction frequency was set at 40 kicks/min. Mean blood flow (MBF) of the femoral artery was continuously measured and averaged over a cardiac cycle by using Doppler sonography. There were no significant differences (P<0.05, by ANOVA) between SS and SL condition of each WR in steady-state MBF.These result suggested that steady-states mean blood flow of femoral artery during knee extension exercise is related to the power output, irrespective of the muscle tension and body position. Less

本研究的目的是确定人类仰卧和直立膝关节伸展运动期间肌张力（长行程长度与短行程长度）对股动脉血流的影响。<2002 年>六名健康受试者（22-46 岁）参加了本研究通过标准程序估算了膝关节伸展运动的功率-持续时间双曲线关系的 LT 和临界功率 (CP)，受试者在仰卧和直立位置进行了 6 分钟的方波膝关节伸展运动。 60 rpm。 WR 为 40%LT、80%LT 和 LT-CP（介于 LT 和 CP 之间），使用多普勒平均血液连续测量并逐秒求平均值。流量（MBF）是通过运动期间使用回声超声确定的股动脉直径、股动脉水平的平均动脉压（MAP）来计算的。稳态 MBF、摄氧量和 HR 随 WR 的增加而线性增加，稳态下每个 WR 之间存在显着差异（P<0.05，方差分析）。 MBF [其余，568 ± 76；40%LT，1948 ± 210；80%LT，2958 ± 150； 3973±303ml/min，平均值±SE]然而，在相同功率输出下，仰卧位和直立位时的MBF相似。<2003年>六名健康受试者（22-47岁）在两种条件（仰卧位）下进行膝关节伸展运动。短行程，SS；仰卧长行程位移固定在 10（短）和 20（长）厘米，长行程只需要一半的肌肉张力。与短划水运动相比，每次运动包括 2 分钟休息、5 分钟踢腿和 2 分钟恢复，这与 5% 的最大自主收缩相关。对每种情况进行从最低强度到最高强度的 30% 的收缩频率设置为 40 次/分钟，连续测量股动脉的平均血流量 (MBF)，并在心动周期内取平均值。通过多普勒超声检查，稳态 MBF 中每个 WR 的 SS 和 SL 状况没有显着差异（P<0.05，ANOVA）。这些结果表明，膝关节伸展运动期间股动脉的稳态平均血流量为与功率输出有关，与肌肉张力和身体位置无关。

项目成果

Walsh ML, A Takahashi, M Endo, A Miura, Y Fukuba: "Effects of ischaemia on subsequent exercise-induced oxygen uptake kinetics in healthy adult humans"Exp.Physiol.. 87(2). 227-235 (2002)

Walsh ML、A Takahashi、M Endo、A Miura、Y Fukuba：“缺血对健康成年人随后运动引起的摄氧动力学的影响”Exp.Physiol.. 87(2)。

Coats, E.M., H.B.Rossiter, J.R.Day, A.Miura, Y.Fukuba, B.J.Whipp.: "Intensity dependent tolerance to exercise after attaining VO_ in humans"J. Appl. Physiol.. (accepted in press). (2003)

Coats, E.M., H.B.Rossiter, J.R.Day, A.Miura, Y.Fukuba, B.J.Whipp.：“人类达到 VO_<2max> 后对运动的强度依赖性耐受性”J.

Coats EM, HB Rossiter, JR Day, A Miura, Y Fukuba, and BJ Whipp: "Intensity dependent tolerance to exercise after attaining VO_ in humans"J.Appl.Physiol.. [accepted in press].

Coats EM、HB Rossiter、JR Day、A Miura、Y Fukuba 和 BJ Whipp：“人类达到 VO_<2 max> 后对运动的强度依赖性耐受性”J.Appl.Physiol.. [已接受媒体]。

木場智史, 林直亨, 三浦 朗, 遠藤雅子, 福場良之, 吉田敬義: "運動時の呼吸循環系の応答に対する筋弛緩時間の影響"信学技報. 102(89). 45-48 (2002)

Satoshi Kiba、Naotoru Hayashi、Akira Miura、Masako Endo、Yoshiyuki Fukuba、Takayoshi Yoshida：“运动期间肌肉放松时间对呼吸循环系统反应的影响”IEICE 技术报告 102(89)。

Fukuba, Y., A.Miura, M.Endo, A.Kan, K.Yanagawa, B.J.Whipp: "The curvature constant parameter of the power-duration curve for varied-power exercise"Med. Sci. Sports Exerc.. (accepted in press). (2003)

Fukuba，Y.，A.Miura，M.Endo，A.Kan，K.Yanakawa，B.J.Whipp：“变功率运动的功率-持续时间曲线的曲率常数参数”Med。