Increase in blood flow and shear stress to nonworking limbs during incremental exercise

Hirofumi Tanaka, Shizuyo Shimizu, Fumiko Ohmori, Yoshiho Muraoka, Mana Kumagai, Mutsuko Yoshizawa, Atsuko Kagaya

研究成果: Article査読

95 被引用数 (Scopus)


Purpose: Regular exercise augments endothelium-dependent vasodilatory capacity in the vasculature located in the nonworking limbs. We determined whether blood flow as well as shear stress would change in inactive limbs during acute incremental exercise. Methods: Eight young healthy female subjects performed graded exercise on arm and leg cycle ergometers that had been modified to minimize the movement of nonworking limbs and to facilitate the placement of Doppler transducers. Both brachial and femoral blood flow was monitored using Doppler ultrasonography. EMG activity was also measured to document that there was no muscular activity in nonworking muscles. Results: During leg exercise, brachial blood flow and calculated shear stress gradually and curvilinearly increased (P < 0.05). At the peak work rate, there was an approximately fourfold increase in blood flow in the brachial artery (19 ± 6 vs 77 ± 16 mL·min-1). Femoral blood flow and calculated shear stress increased progressively and linearly during arm exercise (P < 0.05). Conclusion: We concluded that blood flow to the nonworking limbs increases markedly in proportion to the work intensity. These results suggest that the conduit arteries in the nonworking limbs are exposed to increases in blood flow and shear stress during exercise.

ジャーナルMedicine and Science in Sports and Exercise
出版ステータスPublished - 2006 1月 1

ASJC Scopus subject areas

  • 整形外科およびスポーツ医学
  • 理学療法、スポーツ療法とリハビリテーション


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