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Treadmill Stepping in Newborn Rats.

Aimee L Bozeman, R Blaine Kempe, Nancy Devine

Biorxiv : the Preprint Server for Biology

|March 18, 2026

Summary

This summary is machine-generated.

Neonatal rats adapt their stepping behavior in real-time to treadmill belt speed. Both tail-pinch and quipazine stimulation reliably induced stepping, showing adjustments in step cycle duration and area.

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Area of Science:

Neuroscience
Developmental Biology
Motor Control

Background:

Neonatal stepping is a crucial motor pattern for development.
Understanding how early motor systems adapt to sensory input is vital for developmental neuroscience.

Purpose of the Study:

To investigate the influence of treadmill belt speed on mechanically and pharmacologically induced stepping in one-day-old rats.
To examine real-time adaptations in neonatal rat stepping behavior in response to varying treadmill speeds.

Main Methods:

One-day-old male rat pups were tested on a treadmill at four different belt speeds.
Stepping was induced using tail-pinch (mechanical) and quipazine (5-HT2A agonist, pharmacological).
Measurements included step cycle duration, stance and swing phase durations, and step area.

Main Results:

Tail-pinch induced stepping showed significant time effects but not belt speed effects on cycle duration.
Quipazine-induced stepping resulted in more steps at faster belt speeds and shorter step cycle durations in forelimbs.
Both methods demonstrated that P1 rats exhibit real-time adaptations to moving treadmill belts, with altered step area and cycle durations observed.

Conclusions:

Both mechanical and pharmacological stimulation reliably induce stepping in neonatal rats on a moving treadmill.
One-day-old rats demonstrate real-time motor adaptations to treadmill belt speed.
These findings highlight the plasticity of the neonatal motor system in response to sensory feedback.