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Related Experiment Videos

Aspects of postural development in the rat

A Gramsbergen1, M Van Der AA, H C Geisler

  • 1Medical Physiology/Developmental Neurology, Groningen, The Netherlands.

Equine Veterinary Journal. Supplement
|May 1, 1997
PubMed
Summary

Locomotion development in rats shows distinct muscle activation patterns. Mature walking emerges around day 16, followed by mature postural control by day 20, indicating a sequential development process.

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Area of Science:

  • Developmental biology
  • Neuroscience
  • Biomechanics

Background:

  • Locomotion is a complex motor behavior involving coordinated muscle activity.
  • Understanding the developmental trajectory of locomotion provides insights into neural control and motor learning.
  • The longissimus and gastrocnemius muscles play crucial roles in posture and locomotion.

Purpose of the Study:

  • To investigate the developmental changes in muscle activation patterns during the acquisition of mature locomotion in rats.
  • To determine the temporal relationship between the development of fluent walking and postural control.

Main Methods:

  • Electromyography (EMG) was used to record muscle activation patterns in the longissimus and gastrocnemius muscles.
  • Simultaneous video recording captured locomotion kinematics.
  • Data were collected from rats from the 11th day of postnatal life until maturity.

Main Results:

  • Early locomotion (pre-16 days) exhibited irregular longissimus muscle activation.
  • From day 16, longissimus muscle bursts became more pronounced and differentially activated.
  • Mature walking patterns (around day 15-16) preceded the development of mature postural control (around day 20), evidenced by synchronized ipsilateral muscle activity.

Conclusions:

  • The development of mature locomotion in rats is characterized by distinct temporal stages of muscle activation.
  • Fluent walking emerges before the establishment of mature postural control mechanisms.
  • These findings highlight a sequential maturation of neural circuits underlying motor control.

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