Microvascular perfusion increases after eccentric exercise of the gastrocnemius
Noelle M Selkow1, Daniel C Herman, Zhenqi Liu
1School of Kinesiology and Recreation, Illinois State University, Normal, IL 61761, USA. nselkow@ilstu.edu
Summary
Eccentric exercise significantly increases microvascular blood volume and flow, while decreasing velocity. This response highlights the metabolic demand and can model circulatory system assessments.
Area of Science:
- Physiology
- Exercise Science
- Medical Imaging
Background:
- Microvascular perfusion plays a crucial role in oxygen and nutrient delivery to tissues.
- Eccentric exercise, characterized by muscle lengthening under tension, induces unique physiological responses.
- Contrast-enhanced sonography offers a non-invasive method to assess microvascular dynamics.
Purpose of the Study:
- To evaluate changes in microvascular perfusion immediately following eccentric exercise.
- To utilize contrast-enhanced sonography for quantitative assessment of blood volume, flow, and velocity.
- To understand the immediate circulatory adaptations to a bout of eccentric exercise.
Main Methods:
- 18 healthy volunteers underwent unilateral eccentric calf-lowering exercises.
- Microbubbles were administered intravenously for contrast-enhanced sonography.
- Microvascular perfusion parameters (blood volume, flow, velocity) were measured pre- and post-exercise using replenishment kinetics.
Main Results:
- A significant increase in microvascular blood volume (P < .001) and blood flow (P < .001) was observed post-exercise.
- Blood flow velocity showed a significant decrease (P = .035) after the exercise bout.
- Baseline blood volume increased from 5.88 ± 1.33 dB to 12.20 ± 3.31 dB, and blood flow from 2.34 ± 0.41 dB/s to 4.52 ± 1.05 dB/s.
Conclusions:
- Eccentric exercise significantly alters circulatory responses, likely due to increased metabolic demand.
- The observed elevation in microvascular perfusion suggests a potential model for studying interventions.
- Contrast-enhanced sonography is effective in quantifying immediate microvascular changes after eccentric exercise.
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