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Muscle Stimulation Frequency01:22

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Actin filaments undergo polymerization and depolymerization from either end. The polymerization and depolymerization rates depend on the cytosolic concentration of free G-actins. The polymerization rate is generally higher at the plus or barbed end, while the depolymerization rate is higher at the minus or pointed end. At a steady state, critical concentration describes the concentration of free G-actin monomers at which the polymerization rate at the plus end is equal to that of the...
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Activity-based Training on a Treadmill with Spinal Cord Injured Wistar Rats
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Treadmill stimulation improves newborn stepping.

Kim Siekerman1, Marianne Barbu-Roth, David I Anderson

  • 1Laboratoire Psychologie de la Perception, Université Paris Descartes-CNRS, Paris, France; Department of Physical Education and Sport Sciences, University of Limerick, Limerick, Ireland.

Developmental Psychobiology
|February 4, 2015
PubMed
Summary
This summary is machine-generated.

Newborns can step on a treadmill and adapt their steps to different speeds. This suggests early treadmill interventions may promote infant locomotion development, even from birth.

Keywords:
locomotionneonateperceptual-motor developmentwalking

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Area of Science:

  • Developmental neuroscience
  • Motor control in infants

Background:

  • Infant stepping is a precursor to independent locomotion.
  • The role of external stimuli, like treadmills, in early motor development is not fully understood.

Purpose of the Study:

  • To determine if newborns can step on a treadmill.
  • To assess if newborns adapt their stepping to varying treadmill velocities.
  • To explore the influence of crying on newborn stepping.

Main Methods:

  • Twenty-one newborns (3 days old) participated in 60-second trials.
  • Stepping was recorded on a static treadmill and a treadmill moving at 13.4, 17.2, and 23.4 cm/s.
  • Video analysis quantified stepping frequency, type (real steps vs. pumps), and coordination.

Main Results:

  • Newborns exhibited more real steps on a moving treadmill compared to a static one.
  • Stepping frequency was higher at 17.2 cm/s than at 23.4 cm/s.
  • Stepping quality and coordination improved when infants were crying, irrespective of treadmill condition.

Conclusions:

  • Newborns demonstrate the capacity for treadmill stepping and velocity adaptation.
  • Treadmill interventions could potentially commence at birth to foster motor development in at-risk infants.
  • Further research is required to optimize newborn treadmill protocols and understand arousal's impact on stepping.