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High activity before breeding improves reproductive performance by enhancing mitochondrial function and biogenesis.

Yufeng Zhang1, Adam L Brasher2, Noel R Park2

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Prior physical activity positively impacts reproduction. Female mice that exercised before mating produced larger, heavier litters, demonstrating a beneficial carry-over effect on reproductive success.

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Area of Science:

  • Physiology
  • Reproductive Biology
  • Exercise Science

Background:

  • Organismal physiological responses are often studied in isolation, neglecting the cumulative impact of life experiences.
  • Carry-over effects, where prior experiences influence subsequent performance, can explain individual variations in physiological outcomes.

Purpose of the Study:

  • To investigate if bioenergetic differences from prior physical activity influence reproductive performance in female mice.
  • To determine the impact of exercise-induced carry-over effects on reproductive success and litter outcomes.

Main Methods:

  • Female mice were divided into active (access to running wheel) and inactive groups for one month prior to mating.
  • Mitochondrial respiration, biogenesis, and endogenous antioxidant enzyme activity were assessed.
  • Reproductive outcomes, including litter size and weight, were evaluated.

Main Results:

  • Active mice exhibited enhanced mitochondrial respiration and biogenesis compared to inactive controls.
  • Female mice with prior exercise access produced larger and heavier litters.
  • No significant changes in endogenous antioxidant enzymes were observed between groups.

Conclusions:

  • Pre-breeding physical activity confers a positive carry-over effect on female reproduction in mice.
  • Improved mitochondrial function is a potential mechanism linking exercise to enhanced reproductive outcomes.
  • Environmental conditions experienced before breeding significantly impact reproductive success.