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Selective activation of AMPK‐PGC‐1α or PKB‐TSC2‐mTOR signaling can explain specific adaptive responses to endurance or resistance training‐like electrical muscle stimulation
Abstract
Endurance training induces a partial fast-to-slow muscle phenotype transformation and mitochondrial biogenesis but no growth. In contrast, resistance training mainly stimulates muscle protein synthesis resulting in hypertrophy. The aim of this study was to identify signaling events that may mediate the specific adaptations to these types of exercise. Isolated rat muscles were electrically stimulated with either high frequency (HFS; 6x10 repetitions of 3 s-bursts at 100 Hz to mimic resistance training) or low frequency (LFS; 3 h at 10 Hz to mimic endurance training). HFS significantly increased myofibrillar and sarcoplasmic protein synthesis 3 h after stimulation 5.3- and 2.7-fold, respectively. LFS had no significant effect on protein synthesis 3 h after stimulation but increased UCP3 mRNA 11.7-fold, whereas HFS had no significant effect on UCP3 mRNA. Only LFS increased AMPK phosphorylation significantly at Thr172 by approximately 2-fold and increased PGC-1alpha protein to 1.3 times of control. LFS had no effect on PKB phosphorylation but reduced TSC2 phosphorylation at Thr1462 and deactivated translational regulators. In contrast, HFS acutely increased phosphorylation of PKB at Ser473 5.3-fold and the phosphorylation of TSC2, mTOR, GSK-3beta at PKB-sensitive sites. HFS also caused a prolonged activation of the translational regulators p70 S6k, 4E-BP1, eIF-2B, and eEF2. These data suggest that a specific signaling response to LFS is a specific activation of the AMPK-PGC-1alpha signaling pathway which may explain some endurance training adaptations. HFS selectively activates the PKB-TSC2-mTOR cascade causing a prolonged activation of translational regulators, which is consistent with increased protein synthesis and muscle growth. We term this behavior the "AMPK-PKB switch." We hypothesize that the AMPK-PKB switch is a mechanism that partially mediates specific adaptations to endurance and resistance training, respectively.
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“endurance exercise studies with rodents and humans have shown AMPK signaling and mRNAs involved in mitochondrial biogenesis increase hours following exercise (Fujii et al., 2000; Atherton et al., 2005; Jorgensen et al., 2005)”
From Skeletal Muscle Ribosome and Mitochondrial Biogenesis in Response to Different Exercise Training Modalities (2021) · cites this paper as Atherton et al., 2005
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“In experimental studies, muscle contractions elicited by electrical stimulation induce changes in skeletal muscle signaling pathways similar to changes induced by exercise [15,16,17,18].”
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“In addition, the lower level of REDD1 meant lower induction of TSC2, thus avoiding mTOR signaling inhibition by TSC2, which affects muscle hypertrophy (Atherton et al. 2005) by negatively regulating mTOR activity (Inoki et al. 2002).”
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“(1) found that mTOR and S6K1 phosphorylation was increased in rats 3 hours following high frequency stimulations that were designed to mimic RE.”
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“Thus, phosphorylation of Akt and mTOR Ser2448 is not always consistent with each other immediately following endurance exercise in muscle.”
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“Protein kinase B (Akt/PKB) is a positive regulator of skeletal muscle mass that acts via mTORC1 to activate protein synthesis in response to exercise or feeding (5, 27).”
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“Exercise (Baar et al., 2002) and in vitro electrical stimulation-induced mitochondrial biogenesis (Atherton et al., 2005; Burch et al., 2010) is thought to be primarily regulated by PGC-1a.”
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“Akt/mTORC1 and AMPK was noted to act as a “switch” that controls the synthesis of myofibrillar and metabolic proteins [49, 50], implying that the cellular energy status may be crucial in mediating either a low oxidative phenotype and a large size or a high oxidative phenotype and a small size [33].”
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The mechanistic and ergogenic effects of phosphatidic acid in skeletal muscle
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“Indeed, Atherton et al. (2005) demonstrated that high-frequency electrical stimulation of rat muscle phosphorylated PI3K-Akt and mTOR, promoting an enhancement in translational efficiency.”
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“Accordingly, phosphorylation of eEF2 is typically decreased in the recovery period after maximal muscle contractions to facilitate peptide chain elongation (Atherton et al., 2005).”
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“Indeed, in the experimental model system used in hat study, resistance exercise is known to modulate a numer of cell signaling pathways (Atherton et al., 2005; Coffey t al., 2006; Kramer and Goodyear, 2007) and thus it is posible that changes in one of these in addition to mTORC1 ould be necessary to stimulate eIF2B m…”
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“…and high-frequency (mimicking resistance training) electrical stimulations selectively activated AMPK/PGC-1α and Akt/mTOR signals in rodent skeletal muscle respectively, and concluded that high-frequency electrical stimulation had little effect on AMPK/ PGC-1α pathway (Atherton et al. 2005).”
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“However, aerobic exercise and RE can (but do not always) elicit divergent intramuscular signaling [172] and fractional MPS [136] responses that correspond with specific training adaptations.”
Skeletal Muscle Physiology: Plasticity and Responses to Exercise
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“In experiments initiated by colleagues (Henning Wackerhage and Phil Atherton), it has been possible to gain some insight into signalling mechanisms underlying the process (Atherton et al. 2005).”
BackgroundResistance exercise and skeletal muscle: protein synthesis, degradation, and controversies
Ji, F., Lee, H. S., & Kim, J.-H. (2025) · European Journal of Applied Physiology · doi:10.1007/s00421-025-05832-z · Cited by 26
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“Likewise, increased muscle protein synthesis in response to contraction in rodent muscle occurs in parallel with increased phosphorylation of AKT, mTOR and several downstream signalling proteins in the pathway (Atherton et al. 2005).”
BackgroundUrolithins: A Prospective Alternative against Brain Aging
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Targeting Mitophagy in Alzheimer’s Disease
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“Alter-nately, the high energy consumption during exercise disrupts the balance between AMP and ATP, leading to AMPK activation followed by induction of PGC-1 (cid:2) [268].”
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“In addition, increased phosphorylation of 5′AMP activated protein kinase (AMPK), which regulates cellular metabolism and can control the activity of PPAR gamma coactivator 1 alpha (PGC 1α), the master regulator of mitochondrial biogenesis [77] has been demonstrated after acute and chronic low frequency NMES [76,78].”
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“In general, high-frequency isometric electrical stimulation (60–100 Hz) can induce skeletal muscle hypertrophy (48, 64), whereas lower-frequency electrical stimulation more resembles endurance-like training (5).”
BackgroundMethodDe Souza, E. O., Lowery, R. P., Wilson, J. M., Sharp, M. H., Mobley, C. B., Fox, C. D., Lopez, H. L., Shields, K. A., Rauch, J. T., Healy, J. C., et al. (2016) · PLOS ONE · doi:10.1371/journal.pone.0155153 · Cited by 23
“The exercise model was selected to mimic a strength-training stimulus based on its efficacy in inducing acute increases in protein synthesis and to promote skeletal muscle hypertrophy in a chronic fashion [20, 21].”
MethodTan, J., Krasilshchikov, O., Kuan, G., Hashim, H. A., Aldhahi, M. I., Al-Mhanna, S. B., & Badicu, G. (2023) · Healthcare · doi:10.3390/healthcare11172443 · Cited by 23
Hoshino, D., Kawata, K., Kunida, K., Hatano, A., Yugi, K., Wada, T., Fujii, M., Sano, T., Ito, Y., Furuichi, Y., et al. (2020) · iScience · doi:10.1016/j.isci.2020.101558 · Cited by 23
“Exercise has a wide variety of modes such as endurance exercise and resistance exercise; cellular responses are different between each exercise mode (Atherton et al., 2005).”
BackgroundSestrin2, a Regulator of Thermogenesis and Mitohormesis in Brown Adipose Tissue
Ro, S., Semple, I. A., Ho, A., Park, H., & Lee, J. H. (2015) · Frontiers in Endocrinology · doi:10.3389/fendo.2015.00114 · Cited by 24
“Sestrin2may promotemitochondrial biogenesis through activation of AMPK (7, 12, 101, 102) and subsequent upregulation of PGC-1α activity (103, 104).”
BackgroundAutophagy in Skeletal MusclePreprint
Franco‐Romero, A., Sandri, M., & Schiaffino, S. (2024) · Cold Spring Harbor Perspectives in Biology · doi:10.1101/cshperspect.a041565 · Cited by 23
O’Connor, D., Caulfield, B., & Lennon, O. C. (2018) · Supportive Care in Cancer · doi:10.1007/s00520-018-4342-7 · Cited by 22
Active and Passive Tension Interact to Promote Akt Signaling with Muscle Contraction
RUSS, D. W. (2008) · Medicine & Science in Sports & Exercise · doi:10.1249/mss.0b013e318158e450 · Cited by 21
Michel, J. M., Godwin, J. S., Plotkin, D. L., McIntosh, M. C., Mattingly, M. L., Agostinelli, P. J., Mueller, B. J., Anglin, D. A., Kontos, N. J., Berry, A. C., et al. (2025) · Journal of Applied Physiology · doi:10.1152/japplphysiol.00837.2024 · Cited by 20
A primer on global molecular responses to exercise in skeletal muscle: Omics in focus
Murach, K. A., & Bagley, J. R. (2025) · Journal of sport and health science/Journal of Sport and Health Science · doi:10.1016/j.jshs.2025.101029 · Cited by 22
Muscle Hypertrophy in a Newly Developed Resistance Exercise Model for Rats
Al‐Sarraf, H., & Mouihate, A. (2022) · Frontiers in Physiology · doi:10.3389/fphys.2022.851789 · Cited by 21
“However, the metabolic changes that occur at cellular, tissue and organ levels vary considerably between these types of training (Atherton et al., 2005; Coffey et al., 2006; Coffey and Hawley, 2007; Egan and Zierath, 2013).”
BackgroundGehlert, S., Theis, C., Weber, S., Schiffer, T., Hellmich, M., Platen, P., & Bloch, W. (2010) · Lymphatic Research and Biology · doi:10.1089/lrb.2009.0035 · Cited by 21
Valero‐Breton, M., Warnier, G., Castro‐Sepúlveda, M., Deldicque, L., & Zbinden‐Foncea, H. (2020) · Frontiers in Bioengineering and Biotechnology · doi:10.3389/fbioe.2020.565679 · Cited by 21
“To date, several studies have shown low frequency EPS (0.2–2 Hz) to act as an endurance exercise mimetic (Lambernd et al., 2012; Nikolić et al., 2012; Brown et al., 2015).”
BackgroundInfluentialGray, S. R., Ratkevičius, A., Wackerhage, H., Coats, P., & Nimmo, M. A. (2009) · Experimental Physiology · doi:10.1113/expphysiol.2009.048173 · Cited by 22
“The procedures were similar to those previously described (Atherton et al. 2005).”
MethodPimenta, A. D. S., Lambertucci, R. H., Gorjão, R., Silveira, L. R., & Curi, R. (2007) · European Journal of Applied Physiology · doi:10.1007/s00421-007-0542-4 · Cited by 21
Yoo, A., Jang, Y. J., Ahn, J., Jung, C. H., & Ha, T. Y. (2021) · Phytomedicine · doi:10.1016/j.phymed.2021.153658 · Cited by 20
Jacko, D., Schaaf, K., Masur, L., Windoffer, H., Aussieker, T., Schiffer, T., Zacher, J., Bloch, W., & Gehlert, S. (2022) · International Journal of Molecular Sciences · doi:10.3390/ijms23105431 · Cited by 20
Adiponectin: key role and potential target to reverse energy wasting in chronic heart failure
Berendoncks, A. M. V., Garnier, A., Ventura‐Clapier, R., & Conraads, V. M. (2012) · Heart Failure Reviews · doi:10.1007/s10741-012-9349-4 · Cited by 20
“wasting [24] by a mechanism that may involve adenosine monophosphate–activated protein kinase (AMPK) activation [25, 26].”
Lima, Y. C., Kurauti, M. A., Alves, G. D. F., Ferezini, J., Piovan, S., Malta, A., de Almeida, F. L. A., Gomes, R. M., Mathias, P. C. D. F., Milani, P. G., et al. (2019) · Nutrition & Metabolism · doi:10.1186/s12986-019-0391-2 · Cited by 20
Liang, J., Wang, P., Jia, W. P., Bao, C., & Han, D. (2015) · Neurochemical Research · doi:10.1007/s11064-015-1569-2 · Cited by 20
Metabolic perturbations in the pathogenesis of hypertrophic cardiomyopathy
Ashrafian, H., & Watkins, H. C. (2005) · Drug Discovery Today Disease Mechanisms · doi:10.1016/j.ddmec.2005.05.014 · Cited by 20
Hong‐Brown, L. Q., Brown, C. R., Huber, D. S., & Lang, C. H. (2008) · Journal of Cellular Biochemistry · doi:10.1002/jcb.21882 · Cited by 20
“…of eEF2 and eEF2K in response to various stimuli such as low cellular energy level, hypoxia, electrical stimulation [McLeod and Proud, 2002; Atherton et al., 2005; Terai et al., 2005], hormones (e.g., serotonin, phenylephrine) and growth factors [insulin, IGF-I, Wang and Proud, 2002;…”
BackgroundStadhouders, L. E. M., Smith, J. A. B., Gabriel, B. M., Verbrugge, S. A. J., Hammersen, T. D., Kolijn, D., Vogel, I. S. P., Mohamed, A. D., de Wit, G. M. J., Offringa, C., et al. (2023) · Experimental Cell Research · doi:10.1016/j.yexcr.2023.113820 · Cited by 19
Rengo, J. L., Savage, P. D., Hirashima, F., Leavitt, B. J., Ades, P. A., & Toth, M. J. (2021) · Journal of Cardiopulmonary Rehabilitation and Prevention · doi:10.1097/hcr.0000000000000576 · Cited by 19
Resistance Training Improves Hypertrophic and Mitochondrial Adaptation in Skeletal Muscle
Zhao, Y., & Wu, Y. (2023) · International Journal of Sports Medicine · doi:10.1055/a-2059-9175 · Cited by 20
“Early animal studies demonstrated that, in skeletal muscle, low-frequency electrical stimulation (mimicking endurance training) selectively enhanced AMP-activated protein kinase (AMPK)/peroxisome proliferator-activated receptor γ coactivator 1α (PGC-1α) signaling, which activates mitochondrial biogenesis, and that hig…”
BackgroundAcute vs. chronic hypoxia: What are the consequences for skeletal muscle mass?
Deldicque, L., & Francaux, M. (2013) · doi:10.7457/cmep.v2i1 · Cited by 19
“In order to dissect out the true molecular nature of the interference effect, study designs that incorporate truly divergent signalling paradigms are needed (Atherton et al., 2005) to overcome the clear molecular ‘noise’ that occurs during resistance and cycling exercise studies.”
BackgroundShirvani, H., Rahmati-Ahmadabad, S., Broom, D. R., & Mirnejad, R. (2019) · Journal of Experimental Biology · doi:10.1242/jeb.198424 · Cited by 19
“Resistance training increases phosphorylation of the anabolic Akt/mTOR signalling pathway, as well as activation of the translation initiation regulators p70 S6k, 4E-BP1 and eIF2B (Atherton et al., 2005).”
BackgroundMueller, S. M., Aguayo, D., Lunardi, F., Ruoss, S., Boutellier, U., Frese, S., Petersen, J. A., Jung, H. H., & Toigo, M. (2013) · European Journal of Applied Physiology · doi:10.1007/s00421-013-2752-2 · Cited by 18
“…sclerosis protein 2 (tSc2), which inhibits the mammalian target of rapamycin complex 1 (mtOrc1). the downregulation of the key component in integrating resistance training-activated signaling pathways (mtOr) inhibits the myofibrillar protein synthesis (Atherton et al. 2005; Inoki et al. 2003).”
BackgroundLysenko, E. A., Vepkhvadze, T. F., Lednev, E. M., Виноградова, О. Л., & Popov, D. V. (2016) · The Journal of Physiological Sciences · doi:10.1007/s12576-016-0506-8 · Cited by 18
“The latter effect may be explained by an antagonistic relationship between the signaling pathways regulating mitochondrial biogenesis and protein synthesis [8] as well as endurance exerciseinduced activation of the ubiquitin proteasome system [9–12].”
BackgroundUno, H., Kamiya, S., Akimoto, R., Hosoki, K., Tadano, S., Kouzaki, K., Tamura, Y., Kotani, T., Isemura, M., & Nakazato, K. (2022) · Scientific Reports · doi:10.1038/s41598-022-25359-z · Cited by 17
Agergaard, J., Reitelseder, S., Pedersen, T. G., Doessing, S., Schjerling, P., Langberg, H., Miller, B. F., Aagaard, P., Kjær, M., & Holm, L. (2012) · Muscle & Nerve · doi:10.1002/mus.23667 · Cited by 17
Effect of Resistance Exercise on Muscle Metabolism and Autophagy in sIBM
Jeong, J., YANG, D.-S., Koo, J., Hwang, D.-J., Cho, J., & Kang, E. (2017) · Medicine & Science in Sports & Exercise · doi:10.1249/mss.0000000000001286 · Cited by 17
Sun, J., Zhang, C., Kim, M., Su, Y., Qin, L., Dong, J., Zhou, Y., & Ding, S. (2018) · BMB Reports · doi:10.5483/bmbrep.2018.51.4.236 · Cited by 17
Shirai, T., Aoki, Y., Takeda, K., & Takemasa, T. (2020) · Physiological Reports · doi:10.14814/phy2.14411 · Cited by 16
“The characteristic activation pattern of AMPK involves an increase in such occurring immediately after exercise with a return to the basal level at 1 hr after exercise (Atherton et al., 2005).”
BackgroundInfluentialSteele, J., Butler, A., Comerford, Z., Dyer, J. E., Lloyd, N., Ward, J. M., Fisher, J. P., Gentil, P., Scott, C. B., & Ozaki, H. (2018) · PeerJ · doi:10.7717/peerj.4403 · Cited by 18
“There were no significant effects by ‘condition’ for mean RMS amplitude (F(1,6) = 0.”
BackgroundProtein synthesis a low priority for exercising muscle
Atherton, P. J., & Rennie, M. J. (2006) · The Journal of Physiology · doi:10.1113/jphysiol.2006.110247 · Cited by 17
“…(MAPK) family members (e.g. ERK1/2, p38) (Williamson et al. 2003); proteins of the canonical insulin receptor signalling pathway (e.g. Akt, mTOR) (Atherton et al. 2005); contraction-induced Ca2+-dependent pathways (e.g. PKC, CamK) (Rose et al. 2005) and AMPK (Frosig et al. 2004) to name but a…”
BackgroundResultSignaling Responses After Varying Sequencing of Strength and Endurance Training in a Fed State
Jones, T. W., Walshe, I. H., Hamilton, D. L., Howatson, G., Russell, M., Price, O. J., Gibson, A. S. C., & French, D. N. (2016) · International Journal of Sports Physiology and Performance · doi:10.1123/ijspp.2015-0534 · Cited by 18
Anabolic and Catabolic Signaling Pathways That Regulate Skeletal Muscle Mass
McCarthy, J. J., & Murach, K. A. (2018) · Elsevier eBooks · doi:10.1016/b978-0-12-813922-6.00024-2 · Cited by 17
Shi, H., Li, F., Zhang, F., Wei, X., Liu, C., & Duan, R. (2023) · Journal of NeuroEngineering and Rehabilitation · doi:10.1186/s12984-023-01208-6 · Cited by 15
Metadata
- Authors
- Atherton, P. J., Babraj, J. A., Smith, K., Singh, J., Rennie, M. J., & Wackerhage, H.
- Affiliations
- University of Nottingham (GB)
- University of Dundee (GB)
- University of Lancashire (GB)
- ORCID
- Venue
- The FASEB Journal
- Publisher
- Wiley
- Published
- 2005-02-16
- Volume
- 19
- Issue
- 7
- Pages
- 1-23
- ISSN
- 0892-6638 (ISSN-L)
- 1530-6860
- OpenAlex
- W2115928938
- Cited by
- 475
- References
- 62
- Citations by year
- 2026: 9 · 2025: 11 · 2024: 10 · 2023: 21 · 2022: 15 · 2021: 15 · 2020: 18 · 2019: 25 · 2018: 35 · 2017: 16 · 2016: 22 · 2015: 20 · 2014: 30 · 2013: 33 · 2012: 23
- FWCI
- 12.47
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- The FASEB Journal (publishedVersion)
- PubMed (publishedVersion)
- CLOK (University of Central Lancashire) (submittedVersion)
- Funders
- National Institutes of Health (AR 49869)
- Biotechnology and Biological Sciences Research Council
- Diabetes UK
- Tenovus
- University of Central Lancashire
- University of Dundee
- Topics
- Health Sciences › Nursing › Nutrition and Dietetics › Muscle metabolism and nutrition
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
- Keywords
- AMPK/PGC-1α signaling, neuromuscular electrical stimulation, high-frequency stimulation, low-frequency stimulation, endurance training adaptation, resistance training adaptation, muscle protein synthesis, muscle hypertrophy, mitochondrial biogenesis, UCP3, translational regulation, p70S6K, 4E-BP1
- MeSH terms
- Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha, Tuberous Sclerosis Complex 2 Protein, Adaptation, Physiological, Adenylate Kinase, Animals, Electric Stimulation, Enzyme Activation, Physical Exertion, Male, Muscle Contraction, Muscle Proteins, Myofibrils, Phosphorylation, Physical Conditioning, Animal, Physical Endurance, Protein Kinases, Sarcoplasmic Reticulum, Transcription Factors, Signal Transduction, RNA-Binding Proteins, Rats, Wistar, Muscle, Skeletal, Mitogen-Activated Protein Kinases, Tumor Suppressor Proteins, Proto-Oncogene Proteins c-akt, Rats, TOR Serine-Threonine Kinases
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