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"Chronic Cervical Midline Contusion in Rats Disrupts Aerobic, Muscular, and Cardiovascular Function".

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  • 1Department of Biomedical Engineering, University of Miami, Coral Gables, Florida, United States.

Biorxiv : the Preprint Server for Biology
|September 5, 2025
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Summary
This summary is machine-generated.

Cervical spinal cord injury (SCI) in rats impairs aerobic fitness and muscle endurance. This preclinical model reveals significant cardiovascular dysfunction, including blood pressure drops and reduced cardiac output, mirroring human SCI complications.

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Area of Science:

  • Cardiovascular Physiology
  • Neuroscience
  • Exercise Physiology

Background:

  • Cervical spinal cord injury (SCI) is linked to significant morbidity and mortality due to cardiovascular dysfunction.
  • Preclinical models for studying cervical SCI's cardiovascular effects are limited.
  • The impact of cervical SCI on aerobic capacity and muscle endurance needs further investigation.

Purpose of the Study:

  • To assess cardiorespiratory fitness, muscle endurance, and cardiovascular function following cervical SCI in a rat model.
  • To utilize a battery of physiological stress tests to evaluate these deficits.
  • To establish a preclinical model for studying cervical SCI-induced cardiovascular impairments.

Main Methods:

  • Female Sprague-Dawley rats underwent either a C8 contusion (cSCI) or laminectomy (LAM) control.
  • Exercise stress tests (metabolic treadmill, isometric pull task) evaluated cardiorespiratory and forelimb fitness.
  • Orthostatic and pharmacological (dobutamine infusion) stress tests challenged cardiovascular system function.

Main Results:

  • cSCI rats showed reduced aerobic fitness, indicated by dysregulated excess post-exercise oxygen consumption.
  • Impaired muscle endurance was observed in cSCI rats compared to controls.
  • Orthostatic stress revealed significant drops in blood pressure and reduced cardiac indices (heart rate, contractility, stroke volume, cardiac output) in cSCI rats.
  • Dobutamine infusion showed significantly reduced cardiac output and stroke volume indices in cSCI rats.

Conclusions:

  • Preclinical cervical SCI in rats leads to clinically relevant impairments in cardiopulmonary exercise performance.
  • This model demonstrates deficits in muscle endurance and cardiovascular function post-cervical SCI.
  • The findings support the utility of this rat model for studying cervical SCI-related cardiovascular complications.