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Delivery of In Vivo Acute Intermittent Hypoxia in Neonatal Rodents to Prime Subventricular Zone-derived Neural Progenitor Cell Cultures

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Muscle Adaptation to Varying Oxygen Concentrations During Weaning in Rats.

Takumi Saito^1,2, Yukino Mori³, Issei Sugimoto^1,4

¹Graduate School of Health Sciences, Aomori University of Health and Welfare, Aomori, JPN.

|October 24, 2025

Summary

Different oxygen levels affect muscle fiber development in young rats, altering muscle size without increasing oxidative stress. These findings are crucial for developmental physiology and rehabilitation.

Keywords:

muscle development muscle fiber oxidative stress oxygen concentration weaning phase

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Area of Science:

Physiology
Developmental Biology
Muscle Biology

Background:

Investigated the impact of varying oxygen concentrations on muscle tissue and oxidative stress during rat weaning.
Aimed to understand developmental specificity during the growth stage under different oxygen conditions.

Purpose of the Study:

To examine the effects of diverse oxygen concentrations on muscle fiber types and cross-sectional area (CSA).
To assess oxidative stress markers in response to different oxygen exposures during development.

Main Methods:

Thirty-three-week-old Wistar rats were divided into five groups (control, 10%, 15%, 40%, 80% oxygen).
Soleus and plantaris muscles were analyzed for fiber type percentage and CSA using adenosine triphosphatase staining.
Blood serum was used to measure oxidative stress; Scheffé's test was applied for statistical analysis (p<0.05).

Main Results:

Increased type I fibers in soleus muscle observed in 10%, 15%, and 40% oxygen groups compared to control.
Soleus muscle CSA was reduced across 10%, 15%, 40%, and 80% oxygen groups.
Plantaris muscle CSA showed decreased size in 10% and 15% oxygen groups, but increased size in 40% and 80% oxygen groups; no significant oxidative stress differences were found.

Conclusions:

Oxygen concentration exposure triggers specific adaptive responses in muscle fibers during development.
These adaptations occur without a significant increase in reactive oxygen species production.
Findings suggest implications for developmental physiology, pediatric rehabilitation, and preventive medicine.