Transient increase in femoral arterial blood flow to the contralateral non-exercising limb during one-legged exercise.
We studied the effect of exercise intensity and duration on blood flow to the non-exercising leg during one-legged dynamic knee extension. Femoral arterial blood flow (FBF) to the non-exercising leg, blood pressure (BP), and heart rate (HR) were monitored during one-legged dynamic knee extension exercise at 15, 30, and 45% maximal voluntary contraction (MVC) in seven healthy females. There was an interaction between exercise intensity and duration for FBF and FVC (P < 0.01). During the initial phase of contralateral leg exercise at all intensities, FBF and femoral vascular conductance (FVC) of non-exercising leg increased, and the increase was larger at higher intensities (P < 0.01). After initial vasodilatation, FBF and FVC decreased to baseline, which suggests the vasoconstriction. However, FBF and FVC gradually increased during exercise at 15% MVC. We conclude that transient vasodilatation at the onset of exercise is followed by gradual change to vasoconstriction in non-exercising limb during dynamic one-legged exercise and these changes are exercise intensity- and duration-dependent.
Yoshizawa
Mutsuko
M
Institute of Health and Sport Sciences, University of Tsukuba, Ibaraki, Japan. myoshizawa@med.taiiku.tsukuba.ac.jp
Shimizu-Okuyama
Shizuyo
S
Kagaya
Atsuko
A
D000328:Adult; D001794:Blood Pressure / Q000502:physiology; D003627:Data Interpretation, Statistical; D015444:Exercise / Q000502:physiology*; D005260:Female; D005263:Femoral Artery / Q000502:physiology*; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D017078:Laser-Doppler Flowmetry; D007866:Leg / Q000098:blood supply* / Q000502:physiology*; D009119:Muscle Contraction / Q000502:physiology; D012039:Regional Blood Flow / Q000502:physiology; D014655:Vascular Resistance / Q000502:physiology