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Neyroud D, Laitano O, Dasgupta A, Lopez C, Schmitt RE, Schneider JZ, Hammers DW, Sweeney HL, Walter GA, Doles J, Judge SM, Judge AR. Blocking muscle wasting via deletion of the muscle-specific E3 ligase MuRF1 impedes pancreatic tumor growth. Commun Biol 2023; 6:519. [PMID: 37179425 PMCID: PMC10183033 DOI: 10.1038/s42003-023-04902-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Accepted: 05/02/2023] [Indexed: 05/15/2023] Open
Abstract
Cancer-induced muscle wasting reduces quality of life, complicates or precludes cancer treatments, and predicts early mortality. Herein, we investigate the requirement of the muscle-specific E3 ubiquitin ligase, MuRF1, for muscle wasting induced by pancreatic cancer. Murine pancreatic cancer (KPC) cells, or saline, were injected into the pancreas of WT and MuRF1-/- mice, and tissues analyzed throughout tumor progression. KPC tumors induces progressive wasting of skeletal muscle and systemic metabolic reprogramming in WT mice, but not MuRF1-/- mice. KPC tumors from MuRF1-/- mice also grow slower, and show an accumulation of metabolites normally depleted by rapidly growing tumors. Mechanistically, MuRF1 is necessary for the KPC-induced increases in cytoskeletal and muscle contractile protein ubiquitination, and the depression of proteins that support protein synthesis. Together, these data demonstrate that MuRF1 is required for KPC-induced skeletal muscle wasting, whose deletion reprograms the systemic and tumor metabolome and delays tumor growth.
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Affiliation(s)
- Daria Neyroud
- Department of Physical Therapy, University of Florida, Gainesville, FL, USA
- Myology Institute, University of Florida, Gainesville, FL, USA
- Institute of Sports Sciences, University of Lausanne, Lausanne, Switzerland
| | - Orlando Laitano
- Myology Institute, University of Florida, Gainesville, FL, USA
- Department of Applied Physiology & Kinesiology, University of Florida, Gainesville, FL, USA
| | - Aneesha Dasgupta
- Department of Anatomy, Cell Biology and Physiology, Indiana University School of Medicine, Indianapolis, IN, USA
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN, USA
| | - Christopher Lopez
- Department of Physical Therapy, University of Florida, Gainesville, FL, USA
- Myology Institute, University of Florida, Gainesville, FL, USA
| | - Rebecca E Schmitt
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN, USA
| | - Jessica Z Schneider
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN, USA
| | - David W Hammers
- Myology Institute, University of Florida, Gainesville, FL, USA
- Department of Pharmacology and Therapeutics, University of Florida, Gainesville, FL, USA
| | - H Lee Sweeney
- Myology Institute, University of Florida, Gainesville, FL, USA
- Department of Pharmacology and Therapeutics, University of Florida, Gainesville, FL, USA
| | - Glenn A Walter
- Myology Institute, University of Florida, Gainesville, FL, USA
- Department of Physiology and Aging, University of Florida, Gainesville, FL, USA
| | - Jason Doles
- Department of Anatomy, Cell Biology and Physiology, Indiana University School of Medicine, Indianapolis, IN, USA
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN, USA
| | - Sarah M Judge
- Department of Physical Therapy, University of Florida, Gainesville, FL, USA
- Myology Institute, University of Florida, Gainesville, FL, USA
| | - Andrew R Judge
- Department of Physical Therapy, University of Florida, Gainesville, FL, USA.
- Myology Institute, University of Florida, Gainesville, FL, USA.
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Neyroud D, Laitano O, Daguspta A, Lopez C, Schmitt RE, Schneider JZ, Hammers DW, Sweeney HL, Walter GA, Doles J, Judge SM, Judge AR. Blocking muscle wasting via deletion of the muscle-specific E3 ubiquitin ligase MuRF1 impedes pancreatic tumor growth. Res Sq 2023:rs.3.rs-2524562. [PMID: 36798266 PMCID: PMC9934780 DOI: 10.21203/rs.3.rs-2524562/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Cancer-induced muscle wasting reduces quality of life, complicates or precludes cancer treatments, and predicts early mortality. Herein, we investigated the requirement of the muscle-specific E3 ubiquitin ligase, MuRF1, for muscle wasting induced by pancreatic cancer. Murine pancreatic cancer (KPC) cells, or saline, were injected into the pancreas of WT and MuRF1-/- mice, and tissues analyzed throughout tumor progression. KPC tumors induced progressive wasting of skeletal muscle and systemic metabolic reprogramming in WT mice, but not MuRF1-/- mice. KPC tumors from MuRF1-/- mice also grew slower, and showed an accumulation of metabolites normally depleted by rapidly growing tumors. Mechanistically, MuRF1 was necessary for the KPC-induced increases in cytoskeletal and muscle contractile protein ubiquitination, and the depression of proteins that support protein synthesis. Together, these data demonstrate that MuRF1 is required for KPC-induced skeletal muscle wasting, whose deletion reprograms the systemic and tumor metabolome and delays tumor growth.
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Affiliation(s)
- Daria Neyroud
- Department of Physical Therapy, University of Florida, Gainesville, USA
- Myology Institute, University of Florida, Gainesville, USA
- Institute of Sports Sciences, University of Lausanne, Lausanne, Switzerland
| | - Orlando Laitano
- Myology Institute, University of Florida, Gainesville, USA
- Department of Applied Physiology & Kinesiology, University of Florida, Gainesville, USA
| | - Aneesha Daguspta
- Department of Anatomy, Cell Biology and Physiology, Indiana university school of medicine, Indianapolis, Indiana
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota
| | - Christopher Lopez
- Department of Physical Therapy, University of Florida, Gainesville, USA
- Myology Institute, University of Florida, Gainesville, USA
| | - Rebecca E. Schmitt
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota
| | - Jessica Z. Schneider
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota
| | - David W. Hammers
- Myology Institute, University of Florida, Gainesville, USA
- Department of Pharmacology and Therapeutics, University of Florida, Gainesville, USA
| | - H. Lee Sweeney
- Myology Institute, University of Florida, Gainesville, USA
- Department of Pharmacology and Therapeutics, University of Florida, Gainesville, USA
| | - Glenn A Walter
- Myology Institute, University of Florida, Gainesville, USA
- Department of Physiology and Aging, University of Florida, Gainesville, USA
| | - Jason Doles
- Department of Anatomy, Cell Biology and Physiology, Indiana university school of medicine, Indianapolis, Indiana
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota
| | - Sarah M. Judge
- Department of Physical Therapy, University of Florida, Gainesville, USA
- Myology Institute, University of Florida, Gainesville, USA
| | - Andrew R Judge
- Department of Physical Therapy, University of Florida, Gainesville, USA
- Myology Institute, University of Florida, Gainesville, USA
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D'Lugos AC, Lamm JH, Callaway CS, Judge SM, Judge AR, Neyroud D. Voluntary Physical Activity Prevents Pancreatic Cancer Cachexia, Immobility, And Dysfunction. Med Sci Sports Exerc 2022. [DOI: 10.1249/01.mss.0000879844.02955.e1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Deyhle MR, Callaway CS, Neyroud D, D’Lugos AC, Judge SM, Judge AR. Depleting Ly6G Positive Myeloid Cells Reduces Pancreatic Cancer-Induced Skeletal Muscle Atrophy. Cells 2022; 11:1893. [PMID: 35741022 PMCID: PMC9221479 DOI: 10.3390/cells11121893] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Revised: 06/02/2022] [Accepted: 06/08/2022] [Indexed: 12/22/2022] Open
Abstract
Immune cells can mount desirable anti-cancer immunity. However, some immune cells can support cancer disease progression. The presence of cancer can lead to production of immature myeloid cells from the bone marrow known as myeloid-derived suppressor cells (MDSCs). The immunosuppressive and pro-tumorigenic effects of MDSCs are well understood. Whether MDSCs are involved in promoting cancer cachexia is not well understood. We orthotopically injected the pancreas of mice with KPC cells or PBS. One group of tumor-bearing mice was treated with an anti-Ly6G antibody that depletes granulocytic MDSCs and neutrophils; the other received a control antibody. Anti-Ly6G treatment delayed body mass loss, reduced tibialis anterior (TA) muscle wasting, abolished TA muscle fiber atrophy, reduced diaphragm muscle fiber atrophy of type IIb and IIx fibers, and reduced atrophic gene expression in the TA muscles. Anti-ly6G treatment resulted in greater than 50% Ly6G+ cell depletion efficiency in the tumors and TA muscles. These data show that, in the orthotopic KPC model, anti-Ly6G treatment reduces the number of Ly6G+ cells in the tumor and skeletal muscle and reduces skeletal muscle atrophy. These data implicate Ly6G+ cells, including granulocytic MDSCs and neutrophils, as possible contributors to the development of pancreatic cancer-induced skeletal muscle wasting.
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Affiliation(s)
- Michael R. Deyhle
- Department of Physical Therapy, University of Florida, Gainesville, FL 32610, USA; (M.R.D.); (C.S.C.); (D.N.); (A.C.D.); (S.M.J.)
- Department of Health, Exercise & Sports Sciences, University of New Mexico, Albuquerque, NM 87131, USA
| | - Chandler S. Callaway
- Department of Physical Therapy, University of Florida, Gainesville, FL 32610, USA; (M.R.D.); (C.S.C.); (D.N.); (A.C.D.); (S.M.J.)
| | - Daria Neyroud
- Department of Physical Therapy, University of Florida, Gainesville, FL 32610, USA; (M.R.D.); (C.S.C.); (D.N.); (A.C.D.); (S.M.J.)
- Faculty of Biology and Medicine, Institute of Sport Sciences, University of Lausanne, Quartier UNIL-Centre, Building Synathlon, 1015 Lausanne, Switzerland
| | - Andrew C. D’Lugos
- Department of Physical Therapy, University of Florida, Gainesville, FL 32610, USA; (M.R.D.); (C.S.C.); (D.N.); (A.C.D.); (S.M.J.)
| | - Sarah M. Judge
- Department of Physical Therapy, University of Florida, Gainesville, FL 32610, USA; (M.R.D.); (C.S.C.); (D.N.); (A.C.D.); (S.M.J.)
| | - Andrew R. Judge
- Department of Physical Therapy, University of Florida, Gainesville, FL 32610, USA; (M.R.D.); (C.S.C.); (D.N.); (A.C.D.); (S.M.J.)
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Neyroud D, Nosacka RL, Callaway CS, Trevino JG, Hu H, Judge SM, Judge AR. FoxP1 is a transcriptional repressor associated with cancer cachexia that induces skeletal muscle wasting and weakness. J Cachexia Sarcopenia Muscle 2021; 12:421-442. [PMID: 33527776 PMCID: PMC8061399 DOI: 10.1002/jcsm.12666] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Revised: 12/05/2020] [Accepted: 12/16/2020] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND Skeletal muscle wasting is a devastating consequence of cancer that affects up to 80% of cancer patients and associates with reduced survival. Herein, we investigated the biological significance of Forkhead box P1 (FoxP1), a transcriptional repressor that we demonstrate is up-regulated in skeletal muscle in multiple models of cancer cachexia and in cachectic cancer patients. METHODS Inducible, skeletal muscle-specific FoxP1 over-expressing (FoxP1iSkmTg/Tg ) mice were generated through crossing conditional Foxp1a transgenic mice with HSA-MCM mice that express tamoxifen-inducible Cre recombinase under control of the skeletal muscle actin promoter. To determine the requirement of FoxP1 for cancer-induced skeletal muscle wasting, FoxP1-shRNA was packaged and targeted to muscles using AAV9 delivery prior to inoculation of mice with Colon-26 Adenocarcinoma (C26) cells. RESULTS Up-regulation of FoxP1 in adult skeletal muscle was sufficient to induce features of cachexia, including 15% reduction in body mass (P < 0.05), and a 16-27% reduction in skeletal muscle mass (P < 0.05) that was characterized by a 20% reduction in muscle fibre cross-sectional area of type IIX/B muscle fibres (P = 0.020). Skeletal muscles from FoxP1iSkmTg/Tg mice also showed significant damage and myopathy characterized by the presence of centrally nucleated myofibres, extracellular matrix expansion, and were 19-26% weaker than controls (P < 0.05). Transcriptomic analysis revealed FoxP1 as a potent transcriptional repressor of skeletal muscle gene expression, with enrichment of pathways related to skeletal muscle structure and function, growth signalling, and cell quality control. Because FoxP1 functions, at least in part, as a transcriptional repressor through its interaction with histone deacetylase proteins, we treated FoxP1iSkmTg/Tg mice with Trichostatin A, and found that this completely prevented the loss of muscle mass (p = 0.007) and fibre atrophy (P < 0.001) in the tibialis anterior. In the context of cancer, FoxP1 knockdown blocked the cancer-induced repression of myocyte enhancer factor 2 (MEF2)-target genes critical to muscle differentiation and repair, improved muscle ultrastructure, and attenuated muscle fibre atrophy by 50% (P < 0.05). CONCLUSIONS In summary, we identify FoxP1 as a novel repressor of skeletal muscle gene expression that is increased in cancer cachexia, whose up-regulation is sufficient to induce skeletal muscle wasting and weakness, and required for the normal wasting response to cancer.
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Affiliation(s)
- Daria Neyroud
- Department of Physical TherapyUniversity of FloridaGainesvilleFLUSA
| | | | | | | | - Hui Hu
- Department of MicrobiologyUniversity of Alabama at BirminghamBirminghamALUSA
| | - Sarah M. Judge
- Department of Physical TherapyUniversity of FloridaGainesvilleFLUSA
| | - Andrew R. Judge
- Department of Physical TherapyUniversity of FloridaGainesvilleFLUSA
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Neyroud D. On the path to improved muscle functional testing in cancer patients. Eur J Appl Physiol 2020; 120:1721-1722. [PMID: 32529507 DOI: 10.1007/s00421-020-04411-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- Daria Neyroud
- Department of Physical Therapy, University of Florida, Gainesville, FL, 32610, USA.
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Judge SM, Deyhle MR, Neyroud D, Nosacka RL, D'Lugos AC, Cameron ME, Vohra RS, Smuder AJ, Roberts BM, Callaway CS, Underwood PW, Chrzanowski SM, Batra A, Murphy ME, Heaven JD, Walter GA, Trevino JG, Judge AR. MEF2c-Dependent Downregulation of Myocilin Mediates Cancer-Induced Muscle Wasting and Associates with Cachexia in Patients with Cancer. Cancer Res 2020; 80:1861-1874. [PMID: 32132110 DOI: 10.1158/0008-5472.can-19-1558] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2019] [Revised: 11/27/2019] [Accepted: 02/24/2020] [Indexed: 12/27/2022]
Abstract
Skeletal muscle wasting is a devastating consequence of cancer that contributes to increased complications and poor survival, but is not well understood at the molecular level. Herein, we investigated the role of Myocilin (Myoc), a skeletal muscle hypertrophy-promoting protein that we showed is downregulated in multiple mouse models of cancer cachexia. Loss of Myoc alone was sufficient to induce phenotypes identified in mouse models of cancer cachexia, including muscle fiber atrophy, sarcolemmal fragility, and impaired muscle regeneration. By 18 months of age, mice deficient in Myoc showed significant skeletal muscle remodeling, characterized by increased fat and collagen deposition compared with wild-type mice, thus also supporting Myoc as a regulator of muscle quality. In cancer cachexia models, maintaining skeletal muscle expression of Myoc significantly attenuated muscle loss, while mice lacking Myoc showed enhanced muscle wasting. Furthermore, we identified the myocyte enhancer factor 2 C (MEF2C) transcription factor as a key upstream activator of Myoc whose gain of function significantly deterred cancer-induced muscle wasting and dysfunction in a preclinical model of pancreatic ductal adenocarcinoma (PDAC). Finally, compared with noncancer control patients, MYOC was significantly reduced in skeletal muscle of patients with PDAC defined as cachectic and correlated with MEF2c. These data therefore identify disruptions in MEF2c-dependent transcription of Myoc as a novel mechanism of cancer-associated muscle wasting that is similarly disrupted in muscle of patients with cachectic cancer. SIGNIFICANCE: This work identifies a novel transcriptional mechanism that mediates skeletal muscle wasting in murine models of cancer cachexia that is disrupted in skeletal muscle of patients with cancer exhibiting cachexia.
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Affiliation(s)
- Sarah M Judge
- Department of Physical Therapy, University of Florida Health Science Center, Gainesville, Florida.
| | - Michael R Deyhle
- Department of Physical Therapy, University of Florida Health Science Center, Gainesville, Florida
| | - Daria Neyroud
- Department of Physical Therapy, University of Florida Health Science Center, Gainesville, Florida
| | - Rachel L Nosacka
- Department of Physical Therapy, University of Florida Health Science Center, Gainesville, Florida
| | - Andrew C D'Lugos
- Department of Physical Therapy, University of Florida Health Science Center, Gainesville, Florida
| | - Miles E Cameron
- Department of Physical Therapy, University of Florida Health Science Center, Gainesville, Florida.,Department of Surgery, University of Florida Health Science Center, Gainesville, Florida
| | - Ravneet S Vohra
- Department of Physiology, College of Medicine, University of Florida Health Science Center, Gainesville, Florida
| | - Ashley J Smuder
- Department of Health and Human Performance, University of Florida, Gainesville, Florida
| | - Brandon M Roberts
- Department of Physical Therapy, University of Florida Health Science Center, Gainesville, Florida
| | - Chandler S Callaway
- Department of Physical Therapy, University of Florida Health Science Center, Gainesville, Florida
| | - Patrick W Underwood
- Department of Surgery, University of Florida Health Science Center, Gainesville, Florida
| | - Stephen M Chrzanowski
- Department of Physiology, College of Medicine, University of Florida Health Science Center, Gainesville, Florida
| | - Abhinandan Batra
- Department of Physiology, College of Medicine, University of Florida Health Science Center, Gainesville, Florida
| | - Meghan E Murphy
- Department of Physical Therapy, University of Florida Health Science Center, Gainesville, Florida
| | - Jonathan D Heaven
- Department of Physical Therapy, University of Florida Health Science Center, Gainesville, Florida
| | - Glenn A Walter
- Department of Physiology, College of Medicine, University of Florida Health Science Center, Gainesville, Florida
| | - Jose G Trevino
- Department of Surgery, University of Florida Health Science Center, Gainesville, Florida
| | - Andrew R Judge
- Department of Physical Therapy, University of Florida Health Science Center, Gainesville, Florida.
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Neyroud D, Nosacka RL, Judge AR, Hepple RT. Colon 26 adenocarcinoma (C26)-induced cancer cachexia impairs skeletal muscle mitochondrial function and content. J Muscle Res Cell Motil 2019; 40:59-65. [PMID: 30945134 DOI: 10.1007/s10974-019-09510-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Accepted: 03/23/2019] [Indexed: 01/06/2023]
Abstract
The present study aimed to determine the impact of colon 26 adenocarcinoma (C26)-induced cancer cachexia on skeletal muscle mitochondrial respiration and content. Twelve male CD2F1 mice were injected with C26-cells (tumor bearing (TB) group), whereas 12 age-matched mice received PBS vehicle injection (non-tumor bearing (N-TB) group). Mitochondrial respiration was studied in saponin-permeabilized soleus myofibers. TB mice showed lower body weight (~ 20%) as well as lower soleus, gastrocnemius-plantaris complex and tibialis anterior masses versus N-TB mice (p < 0.05). Soleus maximal state III mitochondrial respiration was 20% lower (10 mM glutamate, 5 mM malate, 5 mM adenosine diphosphate; p < 0.05) and acceptor control ratio (state III/state II) was 15% lower in the TB vs. N-TB (p < 0.05), with the latter suggesting uncoupling. Lower VDAC protein content suggested reduced mitochondrial content in TB versus N-TB (p < 0.05). Skeletal muscle in C26-induced cancer cachexia exhibits reductions in: maximal mitochondrial respiration capacity, mitochondrial coupling and mitochondrial content.
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Affiliation(s)
- Daria Neyroud
- Department of Physical Therapy, University of Florida, 1275 Center Drive, Gainesville, FL, 32610, USA.
| | - Rachel L Nosacka
- Department of Physical Therapy, University of Florida, 1275 Center Drive, Gainesville, FL, 32610, USA
| | - Andrew R Judge
- Department of Physical Therapy, University of Florida, 1275 Center Drive, Gainesville, FL, 32610, USA
| | - Russell T Hepple
- Department of Physical Therapy, University of Florida, 1275 Center Drive, Gainesville, FL, 32610, USA
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Neyroud D, Gonzalez M, Mueller S, Agostino D, Grosprêtre S, Maffiuletti NA, Kayser B, Place N. Neuromuscular adaptations to wide-pulse high-frequency neuromuscular electrical stimulation training. Eur J Appl Physiol 2019; 119:1105-1116. [DOI: 10.1007/s00421-019-04100-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2018] [Accepted: 02/11/2019] [Indexed: 11/30/2022]
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Neyroud D, Cheng AJ, Donnelly C, Bourdillon N, Gassner AL, Geiser L, Rudaz S, Kayser B, Westerblad H, Place N. Toxic doses of caffeine are needed to increase skeletal muscle contractility. Am J Physiol Cell Physiol 2018; 316:C246-C251. [PMID: 30566390 DOI: 10.1152/ajpcell.00269.2018] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Discrepant results have been reported regarding an intramuscular mechanism underlying the ergogenic effect of caffeine on neuromuscular function in humans. Here, we reevaluated the effect of caffeine on muscular force production in humans and combined this with measurements of the caffeine dose-response relationship on force and cytosolic free [Ca2+] ([Ca2+]i) in isolated mouse muscle fibers. Twenty-one healthy and physically active men (29 ± 9 yr, 178 ± 6 cm, 73 ± 10 kg, mean ± SD) took part in the present study. Nine participants were involved in two experimental sessions during which supramaximal single and paired electrical stimulations (at 10 and 100 Hz) were applied to the femoral nerve to record evoked forces. Evoked forces were recorded before and 1 h after ingestion of 1) 6 mg caffeine/kg body mass or 2) placebo. Caffeine plasma concentration was measured in 12 participants. In addition, submaximal tetanic force and [Ca2+]i were measured in single mouse flexor digitorum brevis (FDB) muscle fibers exposed to 100 nM up to 5 mM caffeine. Six milligrams of caffeine per kilogram body mass (plasma concentration ~40 µM) did not increase electrically evoked forces in humans. In superfused FDB single fibers, millimolar caffeine concentrations (i.e., 15- to 35-fold above usual concentrations observed in humans) were required to increase tetanic force and [Ca2+]i. Our results suggest that toxic doses of caffeine are required to increase muscle contractility, questioning the purported intramuscular ergogenic effect of caffeine in humans.
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Affiliation(s)
- Daria Neyroud
- Institute of Sport Sciences, University of Lausanne , Lausanne , Switzerland
| | - Arthur J Cheng
- Department of Physiology and Pharmacology, Karolinska Institutet , Stockholm , Sweden
| | - Chris Donnelly
- Institute of Sport Sciences, University of Lausanne , Lausanne , Switzerland
| | - Nicolas Bourdillon
- Institute of Sport Sciences, University of Lausanne , Lausanne , Switzerland
| | - Anne-Laure Gassner
- School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, Lausanne, Switzerland
| | - Laurent Geiser
- School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, Lausanne, Switzerland
| | - Serge Rudaz
- School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, Lausanne, Switzerland
| | - Bengt Kayser
- Institute of Sport Sciences, University of Lausanne , Lausanne , Switzerland
| | - Håkan Westerblad
- Department of Physiology and Pharmacology, Karolinska Institutet , Stockholm , Sweden
| | - Nicolas Place
- Institute of Sport Sciences, University of Lausanne , Lausanne , Switzerland
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Neyroud D, Nosacka RL, Judge AR, Hepple RT. C26‐Induced Cancer Cachexia Impairs Skeletal Muscle Mitochondrial Function. FASEB J 2018. [DOI: 10.1096/fasebj.2018.32.1_supplement.618.3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Cheng AJ, Neyroud D, Kayser B, Westerblad H, Place N. Intramuscular Contributions to Low-Frequency Force Potentiation Induced by a High-Frequency Conditioning Stimulation. Front Physiol 2017; 8:712. [PMID: 28979214 PMCID: PMC5611669 DOI: 10.3389/fphys.2017.00712] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Accepted: 09/04/2017] [Indexed: 11/13/2022] Open
Abstract
Electrically-evoked low-frequency (submaximal) force is increased immediately following high-frequency stimulation in human skeletal muscle. Although central mechanisms have been suggested to be the major cause of this low-frequency force potentiation, intramuscular factors might contribute. Thus, we hypothesized that two intramuscular Ca2+-dependent mechanisms can contribute to the low-frequency force potentiation: increased sarcoplasmic reticulum Ca2+ release and increased myofibrillar Ca2+ sensitivity. Experiments in humans were performed on the plantar flexor muscles at a shortened, intermediate, and long muscle length and electrically evoked contractile force and membrane excitability (i.e., M-wave amplitude) were recorded during a stimulation protocol. Low-frequency force potentiation was assessed by stimulating with a low-frequency tetanus (25 Hz, 2 s duration), followed by a high-frequency tetanus (100 Hz, 2 s duration), and finally followed by another low-frequency (25 Hz, 2 s duration) tetanus. Similar stimulation protocols were performed on intact mouse single fibers from flexor digitorum brevis muscle, whereby force and myoplasmic free [Ca2+] ([Ca2+]i) were assessed. Our data show a low-frequency force potentiation that was not muscle length-dependent in human muscle and it was not accompanied by any increase in M-wave amplitude. A length-independent low-frequency force potentiation could be replicated in mouse single fibers, supporting an intramuscular mechanism. We show that at physiological temperature (31°C) this low-frequency force potentiation in mouse fibers corresponded with an increase in sarcoplasmic reticulum (SR) Ca2+ release. When mimicking the slower contractile properties of human muscle by cooling mouse single fibers to 18°C, the low-frequency force potentiation was accompanied by minimally increased SR Ca2+ release and hence it could be explained by increased myofibrillar Ca2+ sensitivity. Finally, introducing a brief 200 ms pause between the high- and low-frequency tetanus in human and mouse muscle revealed that the low-frequency force potentiation is abolished, arguing that increased myofibrillar Ca2+ sensitivity is the main intramuscular mechanism underlying the low-frequency force potentiation in humans.
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Affiliation(s)
- Arthur J Cheng
- Department of Physiology and Pharmacology, Karolinska InstitutetStockholm, Sweden
| | - Daria Neyroud
- Faculty of Biology-Medicine, Institute of Sport Sciences, University of LausanneLausanne, Switzerland.,Department of Physical Therapy, University of Florida Health Science CenterGainesville, FL, United States
| | - Bengt Kayser
- Faculty of Biology-Medicine, Institute of Sport Sciences, University of LausanneLausanne, Switzerland
| | - Håkan Westerblad
- Department of Physiology and Pharmacology, Karolinska InstitutetStockholm, Sweden
| | - Nicolas Place
- Faculty of Biology-Medicine, Institute of Sport Sciences, University of LausanneLausanne, Switzerland
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Neyroud D, Grosprêtre S, Gondin J, Kayser B, Place N. Test-retest reliability of wide-pulse high-frequency neuromuscular electrical stimulation evoked force. Muscle Nerve 2017; 57:E70-E77. [PMID: 28722822 DOI: 10.1002/mus.25747] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Revised: 07/05/2017] [Accepted: 07/15/2017] [Indexed: 01/13/2023]
Abstract
INTRODUCTION We compare forces evoked by wide-pulse high-frequency (WPHF) neuromuscular electrical stimulation (NMES) delivered to a nerve trunk versus muscle belly and assess their test-retest intraindividual and interindividual reliability. METHODS Forces evoked during 2 sessions with WPHF NMES delivered over the tibial nerve trunk and 2 sessions over the triceps surae muscle belly were compared. Ten individuals participated in 4 sessions involving ten 20-s WPHF NMES contractions interspaced by 40-s recovery. Mean evoked force and force time integral of each contraction were quantified. RESULTS For both nerve trunk and muscle belly stimulation, intraindividual test-retest reliability was good (intraclass correlation coefficient > 0.9), and interindividual variability was large (coefficient of variation between 140% and 180%). Nerve trunk and muscle belly stimulation resulted in similar evoked forces. DISCUSSION WPHF NMES locations might be chosen by individual preference because intraindividual reliability was relatively good for both locations. Muscle Nerve 57: E70-E77, 2018.
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Affiliation(s)
- Daria Neyroud
- Institute of Sport Sciences, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland
| | - Sidney Grosprêtre
- EA4660-C3S Laboratory, Culture, Sport, Health and Society, University of Bourgogne Franche-Comté, Besançon, France
| | - Julien Gondin
- Institut NeuroMyoGène, Université Claude Bernard Lyon 1, INSERM U1217, CNRS UMR 5310, Villeurbanne, France
| | - Bengt Kayser
- Institute of Sport Sciences, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland
| | - Nicolas Place
- Institute of Sport Sciences, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland
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Neyroud D, Armand S, De Coulon G, Maffiuletti NA, Kayser B, Place N. Plantar flexor muscle weakness and fatigue in spastic cerebral palsy patients. Res Dev Disabil 2017; 61:66-76. [PMID: 28064025 DOI: 10.1016/j.ridd.2016.12.015] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Revised: 12/22/2016] [Accepted: 12/22/2016] [Indexed: 06/06/2023]
Abstract
BACKGROUND Patients with cerebral palsy develop an important muscle weakness which might affect the aetiology and extent of exercise-induced neuromuscular fatigue. AIM This study evaluated the aetiology and extent of plantar flexor neuromuscular fatigue in patients with cerebral palsy. METHODS Ten patients with cerebral palsy and 10 age- and sex-matched healthy individuals (∼20 years old, 6 females) performed four 30-s maximal isometric plantar flexions interspaced by a resting period of 2-3s to elicit a resting twitch. Maximal voluntary contraction force, voluntary activation level and peak twitch were quantified before and immediately after the fatiguing task. RESULTS Before fatigue, patients with cerebral palsy were weaker than healthy individuals (341±134N vs. 858±151N, p<0.05) and presented lower voluntary activation (73±19% vs. 90±9%, p<0.05) and peak twitch (100±28N vs. 199±33N, p<0.05). Maximal voluntary contraction force was not significantly reduced in patients with cerebral palsy following the fatiguing task (-10±23%, p>0.05), whereas it decreased by 30±12% (p<0.05) in healthy individuals. CONCLUSIONS Plantar flexor muscles of patients with cerebral palsy were weaker than their healthy peers but showed greater fatigue resistance. WHAT THIS PAPER ADDS Cerebral palsy is a widely defined pathology that is known to result in muscle weakness. The extent and origin of muscle weakness were the topic of several previous investigations; however some discrepant results were reported in the literature regarding how it might affect the development of exercise-induced neuromuscular fatigue. Importantly, most of the studies interested in the assessment of fatigue in patients with cerebral palsy did so with general questionnaires and reported increased levels of fatigue. Yet, exercise-induced neuromuscular fatigue was quantified in just a few studies and it was found that young patients with cerebral palsy might be more fatigue resistant that their peers. Thus, it appears that (i) conflicting results exist regarding objectively-evaluated fatigue in patients with cerebral palsy and (ii) the mechanisms underlying this muscle fatigue - in comparison to those of healthy peers - remain poorly understood. The present study adds important knowledge to the field as it shows that when young adults with cerebral palsy perform sustained maximal isometric plantar flexions, they appear less fatigable than healthy peers. This difference can be ascribed to a better preservation of the neural drive to the muscle. We suggest that the inability to drive their muscles maximally accounts for the lower extent of exercise-induced neuromuscular fatigue in patients with cerebral palsy.
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Affiliation(s)
- Daria Neyroud
- Institute of Sport Sciences, Faculty of Biology Medicine, University of Lausanne, Lausanne, Switzerland; Institute of Movement Sciences and Sports Medicine, University of Geneva, Geneva, Switzerland
| | - Stéphane Armand
- Willy Taillard Laboratory of Kinesiology, Geneva University Hospitals and Geneva University, Switzerland
| | - Geraldo De Coulon
- Service of Pediatric Orthopaedics, Department of Child and Adolescent Health, Geneva University Hospitals and Geneva University, Geneva, Switzerland
| | | | - Bengt Kayser
- Institute of Sport Sciences, Faculty of Biology Medicine, University of Lausanne, Lausanne, Switzerland; Institute of Movement Sciences and Sports Medicine, University of Geneva, Geneva, Switzerland
| | - Nicolas Place
- Institute of Sport Sciences, Faculty of Biology Medicine, University of Lausanne, Lausanne, Switzerland.
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Neyroud D. Protein Fragmentation As a Regulatory Mechanism: Insights from Two Different Ca 2+ Channels, RyR1 and IP 3R. Front Physiol 2017; 7:655. [PMID: 28101060 PMCID: PMC5209332 DOI: 10.3389/fphys.2016.00655] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Accepted: 12/14/2016] [Indexed: 11/13/2022] Open
Affiliation(s)
- Daria Neyroud
- Faculty of Biology and Medicine, Institute of Sport Sciences, University of Lausanne Lausanne, Switzerland
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Abstract
The mechanisms underlying task failure from fatiguing physical efforts have been the focus of many studies without reaching consensus. An attractive but debated model explains effort termination with a critical peripheral fatigue threshold. Upon reaching this threshold, feedback from sensory afferents would trigger task disengagement from open-ended tasks or a reduction of exercise intensity of closed-ended tasks. Alternatively, the extant literature also appears compatible with a more global critical threshold of loss of maximal voluntary contraction force. Indeed, maximal voluntary contraction force loss from fatiguing exercise realized at a given intensity appears rather consistent between different studies. However, when looking at individual data, the similar maximal force losses observed between different tasks performed at similar intensities might just be an “artifact” of data aggregation. It would then seem possible that such a difference observed between individual and aggregated data also applies to other models previously proposed to explain task failure from fatiguing physical efforts. We therefore suggest that one should be cautious when trying to infer models that try to explain individual behavior from aggregated data.
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Affiliation(s)
- Daria Neyroud
- Institute of Sport Sciences, University of LausanneLausanne, Switzerland; Department of Physiology, Faculty of Biology and Medicine, University of LausanneLausanne, Switzerland
| | - Bengt Kayser
- Institute of Sport Sciences, University of LausanneLausanne, Switzerland; Department of Physiology, Faculty of Biology and Medicine, University of LausanneLausanne, Switzerland
| | - Nicolas Place
- Institute of Sport Sciences, University of LausanneLausanne, Switzerland; Department of Physiology, Faculty of Biology and Medicine, University of LausanneLausanne, Switzerland
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Neyroud D, Cheng AJ, Bourdillon N, Kayser B, Place N, Westerblad H. Muscle Fatigue Affects the Interpolated Twitch Technique When Assessed Using Electrically-Induced Contractions in Human and Rat Muscles. Front Physiol 2016; 7:252. [PMID: 27445844 PMCID: PMC4924481 DOI: 10.3389/fphys.2016.00252] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Accepted: 06/10/2016] [Indexed: 11/13/2022] Open
Abstract
The interpolated twitch technique (ITT) is the gold standard to assess voluntary activation and central fatigue. Yet, its validity has been questioned. Here we studied how peripheral fatigue can affect the ITT. Repeated contractions at submaximal frequencies were produced by supramaximal electrical stimulations of the human adductor pollicis muscle in vivo and of isolated rat soleus fiber bundles; an extra stimulation pulse was given during contractions to induce a superimposed twitch. Human muscles fatigued by repeated 30-Hz stimulation trains (3 s on–1 s off) showed an ~80% reduction in the superimposed twitch force accompanied by a severely reduced EMG response (M-wave amplitude), which implies action potential failure. Subsequent experiments combined a less intense stimulation protocol (1.5 s on–3 s off) with ischemia to cause muscle fatigue, but which preserved M-wave amplitude. However, the superimposed twitch force still decreased markedly more than the potentiated twitch force; with ITT this would reflect increased “voluntary activation.” In contrast, the superimposed twitch force was relatively spared when a similar protocol was performed in rat soleus bundles. Force relaxation was slowed by >150% in fatigued human muscles, whereas it was unchanged in rat soleus bundles. Accordingly, results similar to those in the human muscle were obtained when relaxation was slowed by cooling the rat soleus muscles. In conclusion, our data demonstrate that muscle fatigue can confound the quantification of central fatigue using the ITT.
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Affiliation(s)
- Daria Neyroud
- Institute of Sport Sciences, Faculty of Biology and Medicine, University of LausanneLausanne, Switzerland; Department of Physiology, Faculty of Biology and Medicine, University of LausanneLausanne, Switzerland
| | - Arthur J Cheng
- Department of Physiology and Pharmacology, Karolinska Institutet Stockholm, Sweden
| | - Nicolas Bourdillon
- Institute of Sport Sciences, Faculty of Biology and Medicine, University of LausanneLausanne, Switzerland; Department of Physiology, Faculty of Biology and Medicine, University of LausanneLausanne, Switzerland
| | - Bengt Kayser
- Institute of Sport Sciences, Faculty of Biology and Medicine, University of LausanneLausanne, Switzerland; Department of Physiology, Faculty of Biology and Medicine, University of LausanneLausanne, Switzerland
| | - Nicolas Place
- Institute of Sport Sciences, Faculty of Biology and Medicine, University of LausanneLausanne, Switzerland; Department of Physiology, Faculty of Biology and Medicine, University of LausanneLausanne, Switzerland
| | - Håkan Westerblad
- Department of Physiology and Pharmacology, Karolinska Institutet Stockholm, Sweden
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Neyroud D, Kayser B, Place N. Commentaries on Viewpoint: Inappropriate interpretation of surface EMG signals and muscle fiber characteristics impedes understanding of the control of neuromuscular function. J Appl Physiol (1985) 2015; 119:1519. [DOI: 10.1152/japplphysiol.00753.2015] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Affiliation(s)
- D. Neyroud
- Institute of Sport Sciences Faculty of Biology and Medicine University of Lausanne, Switzerland
| | - B. Kayser
- Institute of Sport Sciences Faculty of Biology and Medicine University of Lausanne, Switzerland
| | - N. Place
- Institute of Sport Sciences Faculty of Biology and Medicine University of Lausanne, Switzerland
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Neyroud D, Armand S, De Coulon G, Da Silva SRD, Wegrzyk J, Gondin J, Kayser B, Place N. Wide-pulse-high-frequency neuromuscular electrical stimulation in cerebral palsy. Clin Neurophysiol 2015; 127:1530-1539. [PMID: 26232132 DOI: 10.1016/j.clinph.2015.07.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2015] [Revised: 06/30/2015] [Accepted: 07/08/2015] [Indexed: 10/23/2022]
Abstract
OBJECTIVE The present study assesses whether wide-pulse-high-frequency (WPHF) neuromuscular electrical stimulation (NMES) could result in extra-force production in cerebral palsy (CP) patients as previously observed in healthy individuals. METHODS Ten CP and 10 age- and sex-matched control participants underwent plantar flexors NMES. Two to three 10-s WPHF (frequency: 100 Hz, pulse duration: 1 ms) and conventional (CONV, frequency 25 Hz, pulse duration: 50 μs) trains as well as two to three burst-like stimulation trains (2s at 25 Hz, 2s at 100 Hz, 2s at 25 Hz; pulse duration: 1 ms) were evoked. Resting soleus and gastrocnemii maximal H-reflex amplitude (Hmax) was normalized by maximal M-wave amplitude (Mmax) to quantify α-motoneuron modulation. RESULTS Similar Hmax/Mmax ratio was found in CP and control participants. Extra-force generation was observed both in CP (+18 ± 74%) and control individuals (+94 ± 124%) during WPHF (p<0.05). Similar extra-forces were found during burst-like stimulations in both groups (+108 ± 110% in CP and +65 ± 85% in controls, p>0.05). CONCLUSION Although the mechanisms underlying extra-force production may differ between WPHF and burst-like NMES, similar increases were observed in patients with CP and healthy controls. SIGNIFICANCE Development of extra-forces in response to WPHF NMES evoked at low stimulation intensity might open new possibilities in neuromuscular rehabilitation.
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Affiliation(s)
- D Neyroud
- Institute of Sport Sciences, University of Lausanne, Lausanne, Switzerland; Department of Physiology, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland; Institute of Movement Sciences and Sports Medicine, University of Geneva, Geneva, Switzerland
| | - S Armand
- Willy Taillard Laboratory of Kinesiology, Geneva University Hospitals and Geneva University, Switzerland
| | - G De Coulon
- Service of Pediatric Orthopaedics, Department of Child and Adolescent Health, Geneva University Hospitals and Geneva University, Geneva, Switzerland
| | - S R D Da Silva
- Institute of Movement Sciences and Sports Medicine, University of Geneva, Geneva, Switzerland; School of Physical Education and Sport, University of São Paulo, Ribeirão Preto, Brazil
| | - J Wegrzyk
- Aix Marseille Université, CNRS, CRMBM UMR 7339, Marseille, France
| | - J Gondin
- Aix Marseille Université, CNRS, CRMBM UMR 7339, Marseille, France
| | - B Kayser
- Institute of Sport Sciences, University of Lausanne, Lausanne, Switzerland; Department of Physiology, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland; Institute of Movement Sciences and Sports Medicine, University of Geneva, Geneva, Switzerland
| | - N Place
- Institute of Sport Sciences, University of Lausanne, Lausanne, Switzerland; Department of Physiology, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland.
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Neyroud D, Kayser B, Westerblad H, Place N. Is The Interpolated Twitch Technique Assessing Central Fatigue Only? Med Sci Sports Exerc 2015. [DOI: 10.1249/01.mss.0000477303.03311.67] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Neyroud D, Temesi J, Millet GY, Verges S, Maffiuletti NA, Kayser B, Place N. Comparison of electrical nerve stimulation, electrical muscle stimulation and magnetic nerve stimulation to assess the neuromuscular function of the plantar flexor muscles. Eur J Appl Physiol 2015; 115:1429-39. [DOI: 10.1007/s00421-015-3124-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2014] [Accepted: 02/03/2015] [Indexed: 01/15/2023]
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Regina Dias Da Silva S, Neyroud D, Maffiuletti NA, Gondin J, Place N. Twitch potentiation induced by two different modalities of neuromuscular electrical stimulation: Implications for motor unit recruitment. Muscle Nerve 2015; 51:412-8. [DOI: 10.1002/mus.24315] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/09/2014] [Indexed: 11/06/2022]
Affiliation(s)
| | - Daria Neyroud
- Institute of Movement Sciences and Sports Medicine, University of Geneva; Geneva Switzerland
| | | | - Julien Gondin
- Aix-Marseille Université, CNRS; CRMBM UMR 7339 Marseille France
| | - Nicolas Place
- Institute of Sport Sciences, Faculty of Biology and Medicine, Quartier UNIL-Mouline, Building Geopolis, University of Lausanne; CH-1015 Lausanne Switzerland
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Neyroud D, Dodd D, Gondin J, Maffiuletti NA, Kayser B, Place N. Wide-pulse-high-frequency neuromuscular stimulation of triceps surae induces greater muscle fatigue compared with conventional stimulation. J Appl Physiol (1985) 2014; 116:1281-9. [DOI: 10.1152/japplphysiol.01015.2013] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
We compared the extent and origin of muscle fatigue induced by short-pulse-low-frequency [conventional (CONV)] and wide-pulse-high-frequency (WPHF) neuromuscular electrical stimulation. We expected CONV contractions to mainly originate from depolarization of axonal terminal branches (spatially determined muscle fiber recruitment) and WPHF contractions to be partly produced via a central pathway (motor unit recruitment according to size principle). Greater neuromuscular fatigue was, therefore, expected following CONV compared with WPHF. Fourteen healthy subjects underwent 20 WPHF (1 ms-100 Hz) and CONV (50 μs-25 Hz) evoked isometric triceps surae contractions (work/rest periods 20:40 s) at an initial target of 10% of maximal voluntary contraction (MVC) force. Force-time integral of the 20 evoked contractions (FTI) was used as main index of muscle fatigue; MVC force loss was also quantified. Central and peripheral fatigue were assessed by voluntary activation level and paired stimulation amplitudes, respectively. FTI in WPHF was significantly lower than in CONV (21,717 ± 11,541 vs. 37,958 ± 9,898 N·s P<0,001). The reductions in MVC force (WPHF: −7.0 ± 2.7%; CONV: −6.2 ± 2.5%; P < 0.01) and paired stimulation amplitude (WPHF: −8.0 ± 4.0%; CONV: −7.4 ± 6.1%; P < 0.001) were similar between conditions, whereas no change was observed for voluntary activation level ( P > 0.05). Overall, our results showed a different motor unit recruitment pattern between the two neuromuscular electrical stimulation modalities with a lower FTI indicating greater muscle fatigue for WPHF, possibly limiting the presumed benefits for rehabilitation programs.
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Affiliation(s)
- Daria Neyroud
- Institute of Sport Sciences, University of Lausanne, Lausanne, Switzerland
- Department of Physiology, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland
- Institute of Movement Sciences and Sports Medicine, University of Geneva, Geneva, Switzerland
| | - David Dodd
- Institute of Movement Sciences and Sports Medicine, University of Geneva, Geneva, Switzerland
| | - Julien Gondin
- Aix Marseille Université, CNRS, CRMBM UMR 7339, Marseille, France; and
| | | | - Bengt Kayser
- Institute of Sport Sciences, University of Lausanne, Lausanne, Switzerland
- Department of Physiology, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland
- Institute of Movement Sciences and Sports Medicine, University of Geneva, Geneva, Switzerland
| | - Nicolas Place
- Institute of Sport Sciences, University of Lausanne, Lausanne, Switzerland
- Department of Physiology, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland
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Neyroud D, Vallotton A, Millet GY, Kayser B, Place N. The effect of muscle fatigue on stimulus intensity requirements for central and peripheral fatigue quantification. Eur J Appl Physiol 2013; 114:205-15. [PMID: 24197080 DOI: 10.1007/s00421-013-2760-2] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Accepted: 10/21/2013] [Indexed: 12/20/2022]
Abstract
PURPOSE The present study was designed to determine the stimulation intensity necessary for an adequate assessment of central and peripheral components of neuromuscular fatigue of the knee extensors. METHODS Three different stimulation intensities (100, 120 and 150% of the lowest intensity evoking a plateau in M-waves and twitch amplitudes, optimal stimulation intensity, OSI) were used to assess voluntary activation level (VAL) as well as M-wave, twitch and doublet amplitudes before, during and after an incremental isometric exercise performed by 14 (8 men) healthy and physically active volunteers. A visual analog scale was used to evaluate the associated discomfort. RESULTS There was no difference (p > 0.05) in VAL between the three intensities before and after exercise. However, we found that stimulating at 100% OSI may overestimate the extent of peripheral fatigue during exercise, whereas 150% OSI stimulations led to greater discomfort associated with doublet stimulations as well as to an increased antagonist co-activation compared to 100% OSI. CONCLUSION We recommend using 120% OSI, as it constitutes a good trade-off between discomfort and reliable measurements.
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Affiliation(s)
- Daria Neyroud
- Institute of Movement Sciences and Sports Medicine, University of Geneva, Geneva, Switzerland
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Neyroud D, Rüttimann J, Mannion AF, Millet GY, Maffiuletti NA, Kayser B, Place N. Comparison of neuromuscular adjustments associated with sustained isometric contractions of four different muscle groups. J Appl Physiol (1985) 2013; 114:1426-34. [DOI: 10.1152/japplphysiol.01539.2012] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The extent and characteristics of muscle fatigue of different muscle groups when subjected to a similar fatiguing task may differ. Thirteen healthy young men performed sustained contractions at 50% maximal voluntary contraction (MVC) force until task failure, with four different muscle groups, over two sessions. Per session, one upper limb and one lower limb muscle group were tested (knee extensors and thumb adductor, or plantar and elbow flexors). Changes in voluntary activation level and contractile properties were derived from doublet responses evoked during and after MVCs before and after exercise. Time to task failure differed ( P < 0.05) between muscle groups (220 ± 64 s for plantar flexors, 114 ± 27 s for thumb adductor, 77 ± 25 s for knee extensors, and 72 ± 14 s for elbow flexors). MVC force loss immediately after voluntary task failure was similar (−30 ± 11% for plantar flexors, −37 ± 13% for thumb adductor, −34 ± 15% for knee extensors, and −40 ± 12% for elbow flexors, P > 0.05). Voluntary activation was decreased for plantar flexors only (from 95 ± 5% to 82 ± 9%, P < 0.05). Potentiated evoked doublet amplitude was more depressed for upper limb muscles (−59.3 ± 14.7% for elbow flexors and −60.1 ± 24.1% for thumb adductor, P < 0.05) than for knee extensors (−28 ± 15%, P < 0.05); no reduction was found in plantar flexors (−7 ± 12%, P > 0.05). In conclusion, despite different times to task failure when sustaining an isometric contraction at 50% MVC force for as long as possible, diverse muscle groups present similar loss of MVC force after task failure. Thus the extent of muscle fatigue is not affected by time to task failure, whereas this latter determines the etiology of fatigue.
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Affiliation(s)
- Daria Neyroud
- Institute of Movement Sciences and Sports Medicine, University of Geneva, Geneva, Switzerland
| | - Jennifer Rüttimann
- Institute of Movement Sciences and Sports Medicine, University of Geneva, Geneva, Switzerland
| | | | | | | | - Bengt Kayser
- Institute of Movement Sciences and Sports Medicine, University of Geneva, Geneva, Switzerland
| | - Nicolas Place
- Institute of Movement Sciences and Sports Medicine, University of Geneva, Geneva, Switzerland
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Abstract
PURPOSE The present study was designed to investigate whether central neural mechanisms limit the duration of a sustained low-force isometric contraction and the maximal force-generating capacity of the knee extensors. METHODS Fourteen healthy males (28 ± 7 yr) were asked to sustain, until voluntary exhaustion, an isometric contraction with their right knee extensor muscles at a target force equal to 20% of their maximal voluntary contraction (MVC) force. At task failure, the muscle was immediately electrically stimulated for 1 min aiming the same target force (20% MVC force). Subsequently, subjects were asked to resume the voluntary contraction for as long as possible. Knee extensor neuromuscular function was assessed before and after the entire protocol for comparison. RESULTS When electrically stimulated at the point of task failure, all subjects developed the 20% MVC force target, indicating that lack of force-generating capacity from peripheral impairment had not limited the duration of the first task. We observed a reduction in MVC force after the entire protocol (-57% ± 12%), which correlated with a decrease in potentiated peak doublet force (-48% ± 17%, P < 0.001). The level of voluntary activation, as quantified with the interpolated twitch technique, was slightly depressed after the entire protocol (from 93% ± 7% to 87% ± 10%, P < 0.01). CONCLUSIONS It follows that task failure from a sustained isometric contraction is mainly affected by central/motivational factors, whereas MVC force loss is largely explained by the extent of contractile failure of the muscle.
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Affiliation(s)
- Daria Neyroud
- Institute of Movement Sciences and Sports Medicine, University of Geneva, Geneva, Switzerland
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Place N, Neyroud D, Kayser B. Explaining Task Failure From Sustained Submaximal Isometric Contractions. Med Sci Sports Exerc 2011. [DOI: 10.1249/01.mss.0000402596.74616.dd] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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