Cited by 437Metabolism, Diabetes, and CancerCardiovascular and exercise physiologyMuscle metabolism and nutrition

The DOI matches its Crossref record; 26 of the 26 references it cites were found in a registry or an index.

Isoform‐specific and exercise intensity‐dependent activation of 5′‐AMP‐activated protein kinase in human skeletal muscle

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Wojtaszewski, Jørgen F. P., Nielsen, Pernille, Hansen, Bo F., Richter, Erik A., Kiens, Bente·2000·The Journal of Physiology

Abstract

1. 5'-AMP-activated protein kinase (AMPK) has been suggested to play a key role in the regulation of metabolism in skeletal muscle. AMPK is activated in treadmill-exercised and electrically stimulated rodent muscles. Whether AMPK is activated during exercise in humans is unknown. 2. We investigated the degree of activation and deactivation of alpha-isoforms of AMPK during and after exercise. Healthy human subjects performed bicycle exercise on two separate occasions at either a low ( approximately 50% maximum rate of O2 uptake (VO2,max) for 90 min) or a high ( approximately 75% VO2,max for 60 min) intensity. Biopsies from the vastus lateralis muscle were obtained before and immediately after exercise, and after 3 h of recovery. 3. We observed a 3- to 4-fold activation of the alpha2-AMPK isoform immediately after high intensity exercise, whereas no activation was observed after low intensity exercise. The activation of alpha2-AMPK was totally reversed 3 h after exercise. In contrast, alpha1-AMPK was not activated during either of the two exercise trials. 4. The in vitro AMP dependency of alpha2-AMPK was significantly greater than that of alpha1-AMPK ( approximately 3- vs. approximately 2-fold). 5. We conclude that in humans activation of alpha2-AMPK during exercise is dependent upon exercise intensity. The stable activation of alpha2-AMPK, presumably due to the activation of an upstream AMPK kinase, is compatible with a role for this kinase complex in the regulation of skeletal muscle metabolism during exercise, whereas the lack of stable alpha1-AMPK activation makes this kinase complex a less likely candidate.

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Registry

Crossref · 10.1111/j.1469-7793.2000.t01-1-00221.x

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  • AMPK activity increases rapidly and then returns to baseline levels within the first 3 h after high-intensity exercise.

    “AMPK activity increases rapidly and then returns to baseline levels within the first 3 h after high-intensity exercise [63]”

    From Using Molecular Biology to Maximize Concurrent Training (2014) · cites this paper as [63]

    The Results report that α2-AMPK activity increased 3- to 4-fold after 60 minutes of high-intensity bicycle exercise and returned to basal levels after 3 hours of recovery. The paper does not establish how rapidly activity increased, and it reports that α1-AMPK activity did not increase; the claim omits that isoform distinction. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • High-intensity exercise activates both AMPK and PGC-1α to a greater extent than low-intensity exercise in skeletal muscle.

    “High-intensity exercise activates both AMPK and peroxisome proliferator-activated receptor co-activator (PGC-1α) to a greater extent than low-intensity exercise in skeletal muscle”

    From Effect of Exercise Training on Fat Loss—Energetic Perspectives and the Role of Improved Adipose Tissue Function and Body Fat Distribution (2021) · cites this paper as Wojtaszewski et al., 2000

    The Results report that high-intensity exercise activated α2-AMPK in human skeletal muscle, while low-intensity exercise did not; neither intensity activated α1-AMPK. The paper does not report PGC-1α activation, so it supports only the AMPK portion of the claim. (LLM, conf=0.90)

    Experimental — accuracy not yet measured
  • AMPK is activated during exercise in both rodents and humans.

    “Consistent with this, AMPK is activated during exercise in both rodents and humans [51-60], in an intensity-dependent manner [57,59-61].”

    From AMPK and Exercise: Glucose Uptake and Insulin Sensitivity (2013) · cites this paper as [57]

  • AMPK activation during exercise is intensity-dependent.

    “Consistent with this, AMPK is activated during exercise in both rodents and humans [51-60], in an intensity-dependent manner [57,59-61].”

    From AMPK and Exercise: Glucose Uptake and Insulin Sensitivity (2013) · cites this paper as [57]

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Research works printed but not linked: 2

  1. Hayashi T., 2000, The alpha2 isoform of the 5′ AMP‐activated protein kinase may mediate contraction stimulated glucose transport in skeletal muscle, Diabetes, 48, A13
  2. Ruderman N. B., 1999, Malonyl‐CoAfuel sensing, and insulin resistance, American Journal of Physiology, 276, E1

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Metadata

Authors
Wojtaszewski, J. F. P., Nielsen, P., Hansen, B. F., Richter, E. A., & Kiens, B.
Affiliations
  • University of Copenhagen (DK)
  • Novo Nordisk (Denmark) (DK)
Corresponding author
Wojtaszewski, Jørgen F. P.
Venue
The Journal of Physiology
Publisher
Wiley
Published
2000-10
Volume
528
Issue
1
Pages
221-226
ISSN
  • 0022-3751 (ISSN-L)
  • 1469-7793
OpenAlex
W2140558936
Cited by
435
References
25
Citations by year
2026: 7 · 2025: 11 · 2024: 10 · 2023: 11 · 2022: 19 · 2021: 18 · 2020: 23 · 2019: 16 · 2018: 13 · 2017: 13 · 2016: 19 · 2015: 18 · 2014: 14 · 2013: 23 · 2012: 16
FWCI
6.52
Type
journal article
Language
en
Open access
Locations
  • The Journal of Physiology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Research at the University of Copenhagen (University of Copenhagen) (submittedVersion)
Funders
  • Sundhed og Sygdom, Det Frie Forskningsråd
  • Danmarks Grundforskningsfond
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Health Sciences › Medicine › Physiology (medical) › Cardiovascular and exercise physiology
  • Health Sciences › Nursing › Nutrition and Dietetics › Muscle metabolism and nutrition
Keywords
AMPK, exercise intensity, skeletal muscle metabolism, vastus lateralis, post-exercise recovery, human exercise
MeSH terms
Adult, Enzyme Activation, Exercise Test, Physical Exertion, Glycogen, Humans, Isoenzymes, Male, Multienzyme Complexes, Protein Serine-Threonine Kinases, Muscle, Skeletal, AMP-Activated Protein Kinases

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