Key result
Doppler ultrasound reliably measures exercise limb blood flow, with maximal arterial dilation reaching ~4% to 7%.
Why the study?
This study aimed to assess the relationship between exercise intensity and femoral and axillary artery diameter, determine whether early recovery volume blood flow reflects exercise blood flow, and evaluate how artery caliber, site, and exercise intensity influence Doppler ultrasound blood flow measurement reproducibility.
Does volume blood flow measured during early recovery accurately reflect exercise blood flow using Doppler ultrasound in healthy subjects?
Observational (n=13)
Does volume blood flow measured during early recovery accurately reflect exercise blood flow using Doppler ultrasound in healthy subjects?
Doppler ultrasound blood flow measurements performed immediately after exercise cannot be used as a surrogate for blood flow velocity during exercise, and arterial diameter must be measured at each workload.
Answers are grounded in this paper and cite their sources.
Recovery Doppler measurements may not reflect exercise blood flow; leaves open optimal timing and diameter protocols for future vascular ultrasound studies.
Purpose To use Doppler ultrasound 1) to assess the relationship between exercise intensity and changes in femoral and axillary artery diameter, 2) to determine whether volume blood flow (BF) measured during early recovery accurately reflects exercise BF, and 3) to assess the influence of artery caliber and/or site as well as exercise intensity on BF measurement reproducibility. Methods Thirteen healthy subjects (mean age 25.9+/-7.7 yr) performed progressive and maximal leg-extension (LE) and elbow-flexion (EF) exercises in the supine position. The duration of each stage was 150 s, followed by a 30-s recovery period. Arterial diameter and blood flow velocity were recorded simultaneously and continuously during the last 30 s of exercise as well as 30 s into recovery. Results Arterial dilation was 3.5 and 6.5% at maximal effort in femoral and axillary arteries, respectively. A significant increase was observed for both arteries from workload 2 to peak exercise when arterial cross-sectional area was calculated. Blood flow velocity during the recovery period was significantly different from end-exercise values, depending on time and workload. The coefficients of variation of BF measurement during exercise were 7.1-12.1% and 6.4-9.5% in LE and EF, respectively. Conclusion This study showed that BF measurement with Doppler ultrasound during exercise is reproducible but requires measurement of arterial diameter at each workload. Measurements performed immediately after exercise cannot be used as a surrogate for blood flow velocity during exercise.
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Walther et al. (2006) conducted an observational in Healthy subjects undergoing exercise (n=13). Progressive and maximal leg-extension and elbow-flexion exercise assessed by Doppler ultrasound vs. 30-second early recovery period was evaluated on Arterial diameter dilation and volume blood flow measurement reproducibility during exercise and early recovery. Doppler ultrasound blood flow measurement during exercise was reproducible (CV 7.1-12.1% femoral, 6.4-9.5% axillary), with maximal arterial dilation of 3.5% and 6.5%, respectively.
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