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Related Experiment Videos

Exercise in rats does not alter hypothalamic AMP-activated protein kinase activity.

Ulrika Andersson1, Jonas T Treebak, Jakob N Nielsen

  • 1Cellular Stress Group, MRC Clinical Sciences Centre, Imperial College London, Hammersmith Campus, DuCane Road, London W12 0NN, UK.

Biochemical and Biophysical Research Communications
|March 2, 2005
PubMed
Summary

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Strenuous exercise in rats did not alter hypothalamic AMP-activated protein kinase (AMPK) activity, suggesting this pathway does not regulate energy metabolism during or after exercise. Appetite hormones like ghrelin showed changes, but hypothalamic AMPK remained unaffected.

Area of Science:

  • Exercise Physiology
  • Neuroendocrinology
  • Metabolic Regulation

Background:

  • Hypothalamic AMP-activated protein kinase (AMPK) is implicated in regulating food intake.
  • Exercise influences appetite and substrate depletion, potentially affecting hypothalamic AMPK activity.

Purpose of the Study:

  • To investigate the impact of strenuous exercise on hypothalamic AMPK activity and related signaling pathways in rats.
  • To determine if changes in hypothalamic AMPK activity correlate with alterations in appetite-regulating hormones during and after exercise.

Main Methods:

  • Male rats underwent treadmill running (30 or 60 min) or rest, followed by immediate sacrifice or 60 min recovery in fasted or fed states.
  • Muscle and liver glycogen levels, hypothalamic AMPK activity, and acetyl-CoA carboxylase phosphorylation were measured.

Related Experiment Videos

  • Plasma concentrations of ghrelin and PYY were analyzed.

    • Main Results:

    • Exercise significantly decreased muscle and liver glycogen.
    • Hypothalamic AMPK activity and acetyl-CoA carboxylase phosphorylation remained unchanged immediately post-exercise and during recovery.
    • Plasma ghrelin increased during exercise, while PYY levels were unaffected. Post-exercise, glucose feeding normalized ghrelin and PYY.

    Conclusions:

    • One hour of strenuous exercise in rats does not significantly alter hypothalamic AMPK activity.
    • Changes in energy metabolism during or after exercise are unlikely to be mediated by hypothalamic AMPK.
    • Appetite hormone fluctuations during exercise may occur independently of hypothalamic AMPK signaling.