Biceps muscle blood flow was studied in normal human males during varying degrees of muscle contraction. The results indicate that as the isometric work load increases the muscle blood flow initially increases, reaches a peak, and falls to zero as the maximum isometric force is approached. In all cases where the elbow angle was between 85° and 120°, the muscle blood flow was zero during maximal isometric contraction, as measured by the isotope clearance technique.
Mortimer JT, Kerstein MD, Magnusson R, Petersén I. Muscle Blood Flow in the Human Biceps as a Function of Developed Muscle Force. Arch Surg. 1971;103(3):376-377. doi:10.1001/archsurg.1971.01350090058013