Ultrasound recorded axillary artery blood flow during elbow-flexion exercise

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Abstract
AMUNDSEN, B. H., U. WISLØFF, J. HELGERUD, J. HOFF, and S. A. SLØRDAHL. Ultrasound recorded axillary artery blood flow during elbow-flexion exercise. Med. Sci. Sports Exerc., Vol. 34, No. 8, pp. 1288–1293, 2002. Purpose To characterize and evaluate the repeatability of ultrasound recorded blood flow in the axillary artery during one-arm dynamic elbow flexion. Method 11 healthy women (23 ± 0.9 yr, 168 ± 1.7 cm, 63 ± 1.1 kg) performed 90° elbow flexion in supine position. Mean maximum blood velocity was recorded by ultrasound during and after two submaximal loads, representing 16 and 24% of maximal voluntary contraction, and after exhaustion (V̇O2peak). Axillary artery diameter was measured after each workload. Each subject was examined two times 8 wk apart. Oxygen uptake was measured during exercise. Values are mean ± SE. Results Flow was not different in the two tests. Flow was 25% higher immediately after than during exercise at the submaximal workloads. Flow immediately after V̇O2peak was 1420 ± 79 mL·min−1. Axillary artery diameter after V̇O2peak was 8% larger than at rest. Coefficient of variation ranged from 11 to 23%, Coefficient of repeatability ranged from 230 mL·min−1 at rest to 940 mL·min−1 after exercise. Coefficient of repeatability for artery diameter was 0.09 cm; coefficient of variation for diameter was about 4% at all recording times. Conclusion The present study showed that ultrasound recordings of blood flow during dynamic elbow-flexion exercise were reproducible. The method can be used to study training-induced flow changes and can detect differences of about 130 mL·min−1. Artery diameter seemed to increase as flow and load increased.

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