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1 Department of Health and Sports Sciences, Kawasaki University of Medical Welfare, Kurashiki, Okayama 701-0193, Japan; and 2 Department of Kinesiology and Applied Physiology, University of Colorado at Boulder, Boulder, Colorado 80309
The cross-sectional area (CSA) of
large-conductance arteries increases in response to endurance training
in humans. To determine whether training-induced changes in arterial
structure are systemic in nature or, rather, are confined to the
arteries supplying exercising muscles, we studied 10 young men who
performed one-legged cycle training [80% of one-legged peak
O2 uptake (
O2 peak), 40 min/day, 4 days/wk] for 6 wk and detraining for another 6 wk. There
were no significant differences in baseline one-legged
O2 peak and CSA of the common femoral
artery and vein (via B-mode ultrasound) between experimental and
control legs. In the experimental leg, one-legged
O2 peak increased 16% [from 3.0 ± 0.1 to 3.4 ± 0.1 (SE) l/min], arterial CSA increased 16%
(from 84 ± 3 to 97 ± 5 mm2), and venous CSA
increased 46% (from 56 ± 5 to 82 ± 5 mm2)
after endurance training. These changes returned to baseline during
detraining. There were no changes in one-legged
O2 peak and arterial CSA in the control
leg, whereas femoral venous CSA in the control leg significantly
increased 24% (from 54 ± 5 to 67 ± 4 mm2)
during training. Changes in femoral arterial and venous CSA in the
experimental leg were positively and significantly related to
corresponding changes in one-legged
O2 peak (r = 0.86 and
0.76, respectively), whereas there were no such relations in the
control leg (r = 0.10 and 0.17). When stepwise
regression analysis was performed, a primary determinant of change in
O2 peak was change in femoral arterial
CSA, explaining ~70% of the variability. These results support the
hypothesis that the regional increase in blood flow, rather than
systemic factors, is associated with the training-induced arterial
expansion. Femoral arterial expansion may contribute, at least in part,
to improvement in efficiency of blood transport from the heart to
exercising muscles and may facilitate achievement of aerobic work capacity.
exercise; ultrasound; vascular remodeling
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