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Related Experiment Video

Updated: Jun 27, 2026

An Innovative Running Wheel-based Mechanism for Improved Rat Training Performance
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Published on: September 19, 2016

Voluntary Wheel Running as Refinement Tool for Postoperative Severity Assessment and Humane Endpoint Detection in

Alina L Ottlewski1, Christine Häger2, Elvis J Hermann1

  • 1Department of Neurosurgery, Hannover Medical School, Carl-Neuberg-Straße 1, 30625 Hanover, Germany.

Brain Sciences
|June 26, 2026
PubMed
Summary

Voluntary wheel running (VWR) effectively monitors post-surgical burden in rats, complementing body weight and clinical scores for ethical animal research and identifying humane endpoints.

Keywords:
burden assessmenthumane endpointintracranial tumor modelratvoluntary wheel running

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Last Updated: Jun 27, 2026

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Area of Science:

  • Animal models in neuroscience research
  • Preclinical cancer research methodologies
  • Animal welfare and ethical considerations in research

Background:

  • Assessing animal burden beyond procedural severity is crucial for ethical and legal compliance in rodent tumor models.
  • Voluntary wheel running (VWR) was investigated as a potential indicator of post-surgical burden.
  • The study also explored VWR's utility in detecting humane endpoints.

Purpose of the Study:

  • To evaluate voluntary wheel running (VWR) as a sensitive indicator of post-surgical burden in rats.
  • To determine if VWR can aid in identifying humane endpoints in preclinical studies.
  • To compare VWR outcomes with traditional measures like body weight and telemetry data.

Main Methods:

  • Fourteen male BDIX rats underwent subcutaneous transmitter implantation for heart rate and activity monitoring.
  • Glioblastoma cells were stereotactically injected into the rat's frontal cortex, followed by tumor resection.
  • Body weight, VWR, heart rate, and general activity were continuously monitored until humane endpoint criteria were met.

Main Results:

  • Body weight and VWR showed significant declines after surgical procedures, with tumor resection having the greatest impact.
  • A marked drop in body weight and VWR, alongside increased clinical scores, indicated animals approaching humane endpoints.
  • Activity measures corroborated these findings, though VWR and body weight were more consistent indicators.

Conclusions:

  • Monitoring body weight and VWR provides an effective assessment of postoperative burden in rats undergoing complex surgeries.
  • Voluntary wheel running serves as a valuable supplementary tool for identifying humane endpoints, alongside body weight and clinical scoring.