Middle cerebral artery flow velocity and pulse pressure during dynamic exercise in humans

被引:95
作者
Ogoh, S
Fadel, PJ
Zhang, R
Selmer, C
Jans, O
Secher, NH
Raven, PB
机构
[1] Univ N Texas, Ctr Hlth Sci, Dept Integrat Physiol, Ft Worth, TX 76107 USA
[2] Presbyterian Med Ctr, Inst Exercise & Environm Med, Dallas, TX USA
[3] Univ Texas, SW Med Ctr, Dallas, TX 75230 USA
[4] Univ Copenhagen, Rigshosp, Copenhagen Muscle Res Ctr, Dept Anesthesia, DK-2100 Copenhagen, Denmark
来源
AMERICAN JOURNAL OF PHYSIOLOGY-HEART AND CIRCULATORY PHYSIOLOGY | 2005年 / 288卷 / 04期
关键词
cerebral circulation; diastolic velocity; systolic velocity;
D O I
10.1152/ajpheart.00979.2004
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Exercise challenges cerebral autoregulation ( CA) by a large increase in pulse pressure ( PP) that may make systolic pressure exceed what is normally considered the upper range of CA. This study examined the relationship between systolic blood pressure ( SBP), diastolic blood pressure ( DBP), and mean arterial pressure ( MAP) and systolic ( V-s), diastolic ( V-d). and mean ( V-m) middle cerebral artery ( MCA) blood flow velocity during mild, moderate, and heavy cycling exercise. Dynamic CA and steady- state changes in MCA V in relation to changes in arterial pressure were evaluated using transfer function analysis. PP increased by 37% and 57% during moderate and heavy exercise, respectively ( P < 0.05), and the pulsatility of MCA V increased markedly. Thus exercise increased MCA Vm and Vs ( P < 0.05) but tended to decrease MCA V-d ( P = 0.06). However, the normalized low- frequency transfer function gain between MAP and MCA Vm and between SBP and MCA Vs remained unchanged from rest to exercise, whereas that between DBP and MCA Vd increased from rest to heavy exercise ( P < 0.05). These findings suggest that during exercise, CA is challenged by a rapid decrease rather than by a rapid increase in blood pressure. However, dynamic CA remains able to modulate blood flow around the exercise- induced increase in MCA Vm, even during high- intensity exercise.
引用
收藏
页码:H1526 / H1531
页数:6
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