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Spatial interaction between tissue pressure and skeletal muscle perfusion during contraction
C C van Donkelaar1, J M Huyghe, W J Vankan
1Department of Biomedical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, Netherlands. c.c.v.donkelaar@tue.nl
Journal of Biomechanics
|April 20, 2001
Summary
Muscle perfusion during contraction is limited by intramuscular pressure (P(IM)). This study shows that pressure heterogeneity, not accounted for by the vascular waterfall theory, significantly impacts blood flow and venous pressure.
Area of Science:
- Physiology
- Biomedical Engineering
- Computational Biology
Background:
- The vascular waterfall theory explains reduced muscle perfusion during contraction due to increased intramuscular pressure (P(IM)) and venous resistance.
- This theory does not fully address the heterogeneity of P(IM) distribution within contracting muscles.
Purpose of the Study:
- To investigate the hypothesis that pressure heterogeneity affects the interaction between P(IM) and muscle perfusion.
- To analyze regional tissue perfusion during submaximal tetanic contraction using a computational model.
Main Methods:
- A finite element model of a perfused, contracting skeletal muscle was developed.
- Simulations compared capillary flow in a muscle with a single artery/vein (SIM(1)) versus one with an additional distal artery/vein (SIM(2)).
Main Results:
- While resting and contracted P(IM) were similar, capillary flow and venous pressure differed significantly between SIM(1) and SIM(2).
- SIM(1) showed drastically reduced capillary flow (<10% of SIM(2)) in areas without a draining vein due to elevated central venous pressure obstructing outflow.
- In SIM(2), venous pressure and capillary flow aligned with P(IM) distribution, demonstrating restored perfusion.
Conclusions:
- Regional effects significantly influence the relationship between P(IM) and muscle perfusion during contraction.
- Venous pressure can locally exceed P(IM), a phenomenon not explicitly addressed by the traditional vascular waterfall theory.