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Shikha Snigdha1, Christina de Rivera2, Norton W Milgram2

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Summary

Acute and chronic exercise improve memory consolidation in aged canines. Exercise initiated after memory acquisition significantly enhanced long-term memory, particularly 24 hours later, suggesting accessible cognitive benefits with aging.

Keywords:
agingconcurrent discriminationdogsexercisememory consolidationnovel object recognitionobject locationreversal learning

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Area of Science:

  • Neuroscience
  • Gerontology
  • Exercise Physiology

Background:

  • Age-related cognitive decline impacts learning and memory.
  • Mechanisms linking exercise to improved memory in aging are not fully understood.
  • Memory consolidation is a critical stage for long-term memory formation.

Purpose of the Study:

  • To investigate the effects of acute and chronic exercise on memory consolidation in aged canines.
  • To determine the time-dependent effects of post-acquisition exercise on memory.
  • To explore exercise's potential to re-engage cognitive functions in aging.

Main Methods:

  • Aged canines underwent acute exercise (10 min treadmill) at different time points post-acquisition (immediately, 1h, 24h).
  • Memory was assessed using concurrent discrimination, object location memory (OLM), and novel object recognition tasks.
  • Chronic exercise (10 min/day for 14 days) was also evaluated on OLM and reversal learning tasks.

Main Results:

  • Post-trial acute exercise significantly improved memory consolidation in aged canines, with benefits observed 24 hours after exercise.
  • No significant memory improvements were noted immediately or 1 hour after acute exercise.
  • Chronic exercise training led to improvements in both object location memory and reversal learning tasks.

Conclusions:

  • Exercise, both acute and chronic, can enhance memory consolidation and cognitive function in aged animals.
  • The benefits of exercise on memory are time-dependent, with significant effects seen at 24 hours post-exercise.
  • Cognitive mechanisms for memory improvement remain accessible in aging and can be reactivated through exercise.