Energy balance
Skeletal muscle AMPK activation during exercise is strictly dependent on exercise intensity and duration, with high-intensity/short-duration exercise activating alpha2beta2gamma3 complexes via LKB1, while low-intensity/long-duration exercise activates alpha2beta2gamma1 and alpha1beta2gamma1 complexes via CaMKKbeta.
To target specific metabolic adaptations, you must match your exercise intensity and duration to the desired AMPK complex. High-intensity, short-duration efforts primarily activate the alpha2beta2gamma3 complex via LKB1, while lower-intensity, longer-duration efforts engage alpha2beta2gamma1 and alpha1beta2gamma1 complexes via CaMKKbeta. Simply 'exercising' is not enough; the specific protocol dictates the molecular response.
During exercise at high intensity and moderate duration, alpha2-containing AMPK complexes are predominantly activated... whereas activity of AMPKalpha1 complexes have been found to increase, stay unchanged, or decrease in an intensity- and duration-dependent manner... Specifically, in human vastus lateralis muscle during a short (up to 20 min) and intense exercise bout, AMPK activation is restricted to gamma3-containing complexes (alpha2beta2gamma3)... When exercise is prolonged, alpha2beta2gamma1 heterotrimers are activated... During exercise at lower intensities and of longer duration, a moderate increase in alpha2beta2gamma1 activity and a weak increase in alpha1beta2gamma1 activity have been observed.
Why this rating
The paper is a comprehensive review citing multiple human and rodent studies (refs 76, 101, 115-119) establishing the intensity/duration dependency.
Source
AMPK in skeletal muscle function and metabolism
Rasmus Kjøbsted et al. · The FASEB Journal · 2017
DOI 10.1096/fj.201700442r
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- Exercise training reduces the exercise-induced activation of AMPK in skeletal muscle, primarily due to a significant decrease (10-60%) in AMPKgamma3 protein content and potentially elevated glycogen levels.Good
- Pharmacological activation of AMPK in skeletal muscle promotes glucose transport and fatty acid oxidation while suppressing glycogen synthase activity and protein synthesis.Good
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