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Logo of ejtmEuropean Journal of Translational Myology
 
Eur J Transl Myol. 2015 August 24; 25(4): 208–213.
Published online 2015 August 25. doi:  10.4081/ejtm.2015.5412
PMCID: PMC4748983

Editorial: The EJTM Special “Mobility in Elderly”

This Issue of the European Journal of Translational Myology/Basic Applied Myology Vol. 25(4), 2015 belongs to the series of EJTM Specials onMobility in Elderly”. The issue collects reviews and articles. Their contents were presented at the “MOBIL project completion congress” held at the Wilhelminenspital Wien, Austria the November 8, 2014 to discuss results of the Project: MOBIL (Mobility in Elderly 2008-2014), supported by European Regional Development Fund - Cross Border Cooperation Programme Slovakia – Austria 2007–2013 (Interreg-IVa), project Mobilität im Alter, MOBIL, N_00033 (partners: Ludwig Boltzmann Institute of Electrical Stimulation and Physical Rehabilitation, Austria, Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Austria, and Faculty of Physical Education and Sports, Comenius University in Bratislava, Slovakia).

Since many years the Ludwig Boltzmann Institute of Electrical Stimulation and Physical Rehabilitation, directed by one of us (Prof. Helmut Kern) is counting on the collaboration not only of Austrian and Slovakian Colleagues but also of several research teams of other European and Transatlantic countries, as it is witnessed by the Authors of the reviews and articles of this EJTM Special onMobility in Elderly” and the 150 coauthors of the 50 papers published in international journals listed in PUBMED that the Ludwig Boltzmann Institute of Electrical Stimulation and Physical Rehabilitation, Vienna, Austria published from 2004 to 2015.

From 2000 that a fruitful collaboration leaded by Prof. Helmut Kern succeeded to be granted by the EU to respond to the needs of a peculiar group of Spinal Cord Injury persons with complete Conus and Cauda Equina lesion that completely disconnect the leg muscles from their innervating spinal cord motor neurons. If irreversible, the complete lesion results in degeneration of the muscle tissue, if not counteracted by a purpose-developed Functional Electrical Stimulation (FES) strategy designed and developed in Vienna starting from the 1990s. The final evidence of the effectiveness of the Vienna rehabilitation strategy, was collected thanks to the support of the EU Commission Shared Cost Project RISE (Contract no. QLG5-CT-2001-02191) leaded by Prof. W. Mayr, Dr. C. Hofer (engineering part), Prof. H. Kern (clinical part) with the expert collaboration of C. Forstner, M. Mödlin, M. Vogelauer, S. Löfler, P. Drewniak, H. Stöhr, C. Rossini, S. Zampieri of the LBI, with the partnership of M. Bijak, D. Rafolt, E. Unger, Center of Biomedical Engineering ad Physics, Vienna, Austria; H. A. Cerrel Bazo, Neuromotor Rehabilitation, Cernusco, Milan, Italy; M. R. Dimitrijevic, Physical Medicine and Rehabilitation, Baylor College of Medicine, Houston, TX, USA; G. Exner, Spinal Cord Injury Center, Hamburg, Germany; E. Gallasch, Physiology, Graz, Austria; H. J. Gerner and R. Rupp, Orthopedics, Heidelberg, Germany; W. Girsch, Orthopedics, Speising, Vienna, Austria; T. Helgason, P. Ingvarsson, S. Yngvason, Landspitali-University Hospital, Reykjavik, Iceland; J. Hufgard, M. Obrovsky, Rehabilitation, Klosterneuburg, Austria; H. P. Jonas, Rehabilitation, Bad Häring, Tirol, Austria; S. Lotta, Villanova sull’Arda (PC), Italy; D. Maier and M. Potulski, Murnau, Spinal Cord Injury, Murnau, Germany and the scientific support of Italian Research Teams leaded by U. Carraro, University of Padova and F. Protasi, University of Chieti. Prof. S. Salmons and J. Jarvis, Liverpool University were also engaged in animal experiments, mainly performed in rabbit.

The final report of the EU RISE trial, published in 2010 was the happy-end of a long debated basic and clinical topic, which first studies may be found in the literature of the Nineteenth Century,1 though it was in the 1940s that the study of events occurring in denervated muscle fibers emerged as a topic distinct from the more clinical relevant studies of nerve regeneration and muscle reinnervation.2-4 During the following twenty years, the reports increased in numbers year after year. Finally in 1962 the book edited by Ernest Gutmann summarized previous knowledge from biology to rehabilitation by electrical stimulation and opened the modern era of “The Denervated Muscle”.5 Three pioneers of the modern studies on muscle denervation contributed to the 2014 EJTM Special on “The Long-Term Denervated Muscle” and/or lectured at the 2014Spring PaduaMuscleDays: 1. Bruce M. Carlson, co-author of several papers with Ernest Gutmann on regeneration of transplanted muscles, opens the EJTM Special with the review “The biology of long-term denervated skeletal muscle”.6 He offers to researchers the basic concepts and the results to understand problems and actual or future solutions that continue to nurture Translational Myology; 2. Terje Lømo was the first in 1972 to electrically stimulate denervated rat muscle to test the hypothesis that induced activity modifies muscle properties and indeed he demonstrated that it suppresses one of the hallmarks of muscle fiber denervation, i.e., ACh sensitivity spreading from the synaptic area to the whole sarcolemma.7 Prior to 1972, it was believed that neurotrophic factors, not related to excitatory impulse transmission, played a role in spontaneous fibrillation, another functional marker of muscle denervation, whose appearance is inversely related to the length of the degenerating nerve stump. Lømo and co-workers demonstrated, instead, that chronic electrical stimulation of denervated rat muscles caused ACh-sensitivity to disappear from denervated muscles already ACh supersensitive. Further, he showed that the passive electrical properties and the contractile characteristics that distinguish fast and slow fiber types are under the control of the patterns of activity.8,9 In a report at the First Abano Terme Meeting on Rehabilitation (1985), there reprinted,10 Lømo et al. defended the hypothesis against the criticisms of authoritative neuroscientists. In his 2014 Commentary,11 he states “While reports favoring the existence of neurotrophic factors were numerous before 2000, they have now essentially disappeared from the literature, including original research papers, textbooks and handbooks, which suggest that the hypothesis is no longer arguable. Thus, the results that I presented in our paper in 1985 seem to have held up rather well”. We hope that the EJTM Special on long term denervated muscle, rising again the interest of clinicians and scientists (Terje Lømo, included) on rehabilitation of denervated muscle may add to his merits the pioneering evidence that activity, anyhow imposed, strongly modulate trophism and characteristics of denervated muscles; 3. Clara Franzini-Armstrong lectured at the 2014Spring PaduaMuscleDays on “Structure-function relationships in skeletal muscles. Lessons from ultrastructure”.13 She remembered to us that “Muscle fibers have a stereotyped organization of contractile myofibrils and membrane systems best defined by their ultrastructure. The sliding filament model (in 1945) established currently accepted principles of most cell motility”. Her many contributions to the study of the muscle membrane systems and ability to attract young brilliant scientists to electron microscopy are well known and demonstrated also by two speakers of the 2014Spring PaduaMuscleDays, Feliciano Protasi and Simona Boncompagni of Chieti University.14,15 They have been and are strongly contributing to the success of FES for permanently denervated muscles.16 We would like to add to Clara’s many merits, the pioneering electron microscopy study in the field of muscle denervation: her 1963 article “An electron microscope study of denervation atrophy in red and white skeletal muscle fibers”.17

Standing on the shoulders of these giants, two of us contributed to the EJTM Special three articles that describe history and results of an application of the concepts and discoveries of Bruce M. Carlson, Terje Lømo and Clara Franzini-Armstrong, namely the Vienna Rehabilitation Strategy by home-based Functional Electrical Stimulation (h-b FES) for permanently denervated muscles (Kern H, Carraro U. “Home-based Functional Electrical Stimulation for long-term denervated human muscle: History, basics, results and perspectives of the Vienna Rehabilitation Strategy”). 18 Analytical tools and devices, designed and implemented to diagnose, treat and follow up the Conus Cauda complete syndrome that paralyze large muscles of human legs are also described.18 Among the new analytical tools, Gargiulo P, Helgason T, Ramon C, Jónsson H jr, Carraro U describes “CT and MRI assessment and characterization using segmentation and 3D modeling techniques: applications to muscle, bone and brain”.19 Recently, a multi-disciplinary team of the Interdepartmental Research Center of Myology of the University of Padua is applying the Vienna principles to the apparently easier cases of peripheral incomplete denervation of limbs. To support the project, denervated muscle fibrillation analyses are revisited in the article of Pond A, Marcante A, Zanato R, Martino L, Stramare R, Vindigni V, Zampieri S, Kern H, Masiero S, Piccione F “History, mechanisms and clinical value of fibrillation analyses in muscle denervation and reinnervation by Single Fiber Electromiography and Dynamic Echomyography”.20 Further, in collaboration with his international partners, Dr. Kern is extending the benefits of h-b FES to those subjects, which for different reasons suffer the consequences of muscle weakness, from the mild but unrelenting process of aging,21-24 to the devastating fast progression of muscle cachexia in cancer patients.25,26

The present 25(4), 2015 EJTM Special “Mobility in Elderly” is dedicated to the results of his recent studies, in particular to the Aging Topic. Supported by European Regional Development Fund - Cross Border Cooperation Programme Slovakia – Austria 2007–2013 (Interreg-Iva), project Mobilität im Alter, MOBIL, N_00033the International group of Prof. Helmut Kern collaborators have produced remarkable results published in International impacted journals that are listed below. Here we would like to list and thanks all the 150 authors of the 50 papers in international journals listed in PUBMED that the Ludwig Boltzmann Institute of Electrical Stimulation and Physical Rehabilitation, Vienna, Austria published from 2004 to 2015.27- 76

Without their strenuous scientific, translational and clinical work and brilliant intellectual contributions nothing would have been achieved: Abruzzo PM, Adami N, Ambrosio F, Ashley Z, Baraibar MA, Barberi L, Bassetto F, Belia S, Bijak M, Bily W, Biral D, Blaauw B, Boato N, Boncompagni S, Bosco G, Bottinelli R, Burggraf S, Canepari M, Carnio S, Carraro U, Coletto L, Corbianco S, Cvecka J, Danieli-Betto D, Danner SM, De Rossi M, di Tullio S, Dimitrijevic MR, Doria A, Fanó G, Fend M, Ferrero M, Forstner C, Francini F, Franz C, Friguet B, Fruhmann H, Fulle S, Gallasch E, Gargiulo P, Gava P, Germinario E, Ghirardello A, Gobbo V, Grim-Stieger M, Gudmundsdóttir V, Haller M, Hamar D, Haslinger W, Helgason B, Helgason T, Hendling M, Hoellwarth U, Hofer Ch, Hofstoetter US, Ingvarsson P, Jäger H, Jarvis JC, Jernej R, Kaider A, Kern H, Khan MM, Kinz G, Knútsdóttir S, Kovarik J, Krenn M, La Rovere R, Lanmuller H, Lapalombella R, Lenaz G, Li F, Löfler S, Longa E, LoVerso F, Maffei M, Mancinelli R, Mandl T, Marcante A, Marchionni C, Marini M, Masiero S, Mayr W, McKay WB, Merigliano S, Meyerspeer M, Mildner E, Minassian K, Mödlin M, Moser E, Mosole S, Müller L, Musarò A, Nejc S, Nori A, Paolini C, Paternostro-Sluga T, Pelosi L, Persy I, Piccione F, Pietrangelo L, Pietrangelo T, Pinter MM, Podhorska-Okolow M, Pond A, Protasi F, Rafolt D, Rakos M, Rampudda ME, Raschka D, Raschner C, Rattay F, Ravara B, Reichel M, Reischl M, Reynisson PJ, Richter W, Romanello V, Rosker J, Rossini K, Rudolf R, Rupp R, Salmons S, Sandri M, Sarabon N, Sarzo G, Sbardella S, Schils S, Scordari A, Sedliak M, Sgarbi G, Squecco R, Stramare R, Strohhofer M, Sutherland H, Tansey KE, Tirpakova V, Trimmel L, Unger E, Valente M, Vatnsdal B, Vecchiato M, Vindigni V, Vogelauer M, Yngvason S, Zampieri S, Zanato R, Zanin ME.

Finally, the conclusive remarks of Prof. Helmut Kern at the 2014 Vienna MOBIL project completion conference: I think the presentations were fantastic and they showed that we have done a lot of work in the past 4 years. Every topic here is special and helping our goal: keeping seniors more mobile and prevent them from falling. This may even be the main task for the future. How to train, measure and correlate the outcomes are the most important things. Further, it is very important that when we stimulate we will not avoid the nerve regeneration process. We need precise training procedures. Prof. Hamar’s collaborators are the specialists to work this out. We look forward to our future collaboration and our next project (and preparation of a grant proposal) will start immediately after this conference. One thing only I left to say, thanks to all, and in particular to Mike Willand, whose travel from home to Vienna was the longest.

References

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16. Boncompagni S, Kern H, Rossini K, et al. Structural differentiation of skeletal muscle fibers in the absence of innervation in humans. Proc Natl Acad Sci U S A 2007;104:19339–44. [PubMed]
17. Pellegrino C, Franzini C. An electron microscope study of denervation atrophy in red and white skeletal muscle fibers. J Cell Biol 1963;17:327–49. [PMC free article] [PubMed]
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19. Gargiulo P, Helgason T, Ramon C, et al. CT and MRI assessment and characterization using segmentation and 3D modeling techniques: applications to muscle, bone and brain. Eur J Trans Myol - Basic Appl Myol 2014;24:55–62. [PMC free article] [PubMed]
20. Pond A, Marcante A, Zanato R, et al. “History, mechanisms and clinical value of fibrillation analyses in muscle denervation and reinnervation by Single Fiber EMG and Dynamic Echomyography. Eur J Trans Myol - Basic Appl Myol 2014;24:41–54. [PMC free article] [PubMed]
21. Marcante A, Zanato R, Ferrero M, et al. Recovery of Tetanic Contractility of Denervated Muscle: A Step Toward a Walking Aid for Foot Drop. Biomed Tech (Berl). 2013. Sep 7. pii: /j/bmte.2013.58.issue-s1-A/bmt-2013-4016/bmt-2013-4016.xml. doi: 10.1515/bmt-2013-4016. [Epub ahead of print]. [PubMed]
22. Zanato R, Stramare R, Boato N, et al. Dynamic Echomyography Shows That FES in Peripheral Denervation does not Hamper Muscle Reinnervation. Biomed Tech (Berl). 2013. Sep 7.: /j/bmte.2013.58.issue-s1-A/bmt-2013-4034/bmt-2013-4034.xml. doi: 10.1515/bmt-2013-4034. [Epub ahead of print]. [PubMed]
23. Mosole S, Carraro U, Kern H, et al. Long-Term High-Level Exercise Promotes Muscle Reinnervation With Age. J Neuropathol Exp Neurol. 2014. Mar 6. [Epub ahead of print] [PubMed]
24. Zampieri S, Pietrangelo L, Loefler S, et al. Lifelong Physical Exercise Delays Age-Associated Skeletal Muscle Decline. J Gerontol A Biol Sci Med Sci. 2014. Feb 18. [Epub ahead of print]. [PubMed]
25. Zampieri S, Valente M, Adami N, et al. Polymyositis, dermatomyositis and malignancy: a further intriguing link. Autoimmun Rev. 2010;9:449–53. doi: 10.1016/j.autrev.2009.12.005. Epub 2009 Dec 22. Review. [PubMed]
26. He WA, Berardi E, Cardillo VM, et al. NF-κB-mediated Pax7 dysregulation in the muscle microenvironment promotes cancer cachexia. J Clin Invest 2013;12:4821–35. [PMC free article] [PubMed]
27. Zampieri S, Pietrangelo L, Loefler S, Fruhmann H, Vogelauer M, Burggraf S, Pond A, Grim-Stieger M, Cvecka J, Sedliak M, Tirpáková V, Mayr W, Sarabon N, Rossini K, Barberi L, De Rossi M, Romanello V, Boncompagni S, Musarò A, Sandri M, Protasi F, Carraro U, Kern H. Lifelong physical exercise delays age-associated skeletal muscle decline. J Gerontol A Biol Sci Med Sci. 2015. Feb;70(2):163–73. doi: 10.1093/gerona/glu006. Epub 2014 Feb 18. [PubMed]
28. Gava P, Kern H, Carraro U. Age-associated power decline from running, jumping, and throwing male masters world records. Exp Aging Res. 2015;41(2):115–35. doi: 10.1080/0361073X.2015.1001648. [PubMed]
29. Carraro U, Boncompagni S, Gobbo V, Rossini K, Zampieri S, Mosole S, Ravara B, Nori A, Stramare R, Ambrosio F, Piccione F, Masiero S, Vindigni V, Gargiulo P, Protasi F, Kern H, Pond A, Marcante A. Persistent muscle fiber regeneration in long term denervation. Past, present, future. Eur J Transl Myol. 2015;25(2):77–92. [PMC free article] [PubMed]
30. Hofstoetter US, McKay WB, Tansey KE, Mayr W, Kern H, Minassian K. Modification of spasticity by transcutaneous spinal cord stimulation in individuals with incomplete spinal cord injury. J Spinal Cord Med. 2014. Mar;37(2):202–11. doi: 10.1179/2045772313Y.0000000149. Epub 2013 Nov 26. [PMC free article] [PubMed]
31. Haslinger W, Müller L, Sarabon N, Raschner C, Kern H, Löfler S. A Novel Device to Preserve Physical Activities of Daily Living in Healthy Older People. J Aging Phys Act. 2014. Dec 23. [Epub ahead of print] [PubMed]
32. Carnio S, LoVerso F, Baraibar MA, Longa E, Khan MM, Maffei M, Reischl M, Canepari M, Loefler S, Kern H, Blaauw B, Friguet B, Bottinelli R, Rudolf R, Sandri M. Autophagy impairment in muscle induces neuromuscular junction degeneration and precocious aging. Cell Rep. 2014. Sep 11;8(5):1509–21. doi: 10.1016/j.celrep.2014.07.061. Epub 2014 Aug 28. [PMC free article] [PubMed]
33. Mosole S, Carraro U, Kern H, Loefler S, Fruhmann H, Vogelauer M, Burggraf S, Mayr W, Krenn M, Paternostro-Sluga T, Hamar D, Cvecka J, Sedliak M, Tirpakova V, Sarabon N, Musarò A, Sandri M, Protasi F, Nori A, Pond A, Zampieri S. Long-term high-level exercise promotes muscle reinnervation with age. J Neuropathol Exp Neurol. 2014. Apr;73(4):284–94. doi: 10.1097/NEN.0000000000000032. [PubMed]
34. Haslinger W, Müller L, Mildner E, Löfler S, Kern H, Raschner C. Assessment of a newly developed, active pneumatic-driven, sensorimotor test and training device. Sensors (Basel). 2014. Dec 15;14(12):24174–87. doi: 10.3390/s141224174. [PMC free article] [PubMed]
35. Kern H, Barberi L, Löfler S, Sbardella S, Burggraf S, Fruhmann H, Carraro U, Mosole S, Sarabon N, Vogelauer M, Mayr W, Krenn M, Cvecka J, Romanello V, Pietrangelo L, Protasi F, Sandri M, Zampieri S, Musaro A. Electrical stimulation counteracts muscle decline in seniors. Front Aging Neurosci. 2014. Jul 24;6:189 doi: 10.3389/fnagi.2014.00189. eCollection 2014. [PMC free article] [PubMed]
36. Sarabon N, Rosker J, Loefler S, Kern H. The effect of vision elimination during quiet stance tasks with different feet positions. Gait Posture. 2013. Sep;38(4):708–11. doi: 10.1016/j.gaitpost.2013.03.005. Epub 2013 Apr 6. [PubMed]
37. Hofstoetter US, Hofer C, Kern H, Danner SM, Mayr W, Dimitrijevic MR, Minassian K. Effects of transcutaneous spinal cord stimulation on voluntary locomotor activity in an incomplete spinal cord injured individual. Biomed Tech (Berl). 2013. Sep 7. pii: /j/bmte.2013.58.issue-s1-A/bmt-2013-4014/bmt-2013-4014.xml. doi: 10.1515/bmt-2013-4014. [Epub ahead of print] No abstract available. [PubMed]
38. Zanato R, Stramare R, Boato N, Zampieri S, Kern H, Marcante A, Masiero S, Carraro U. Dynamic Echomyography Shows That FES in Peripheral Denervation does not Hamper Muscle Reinnervation. Biomed Tech (Berl). 2013. Sep 7. pii: /j/bmte.2013.58.issue-s1-A/bmt-2013-4034/bmt-2013-4034.xml. doi: 10.1515/bmt-2013-4034. [Epub ahead of print] No abstract available. [PubMed]
39. Hendling M, Krenn M, Haller MA, Loefler S, Kern H, Mayr W. Compliance monitoring of home based electrical stimulation training of elderly subjects. Biomed Tech (Berl). 2013. Sep 7. pii: /j/bmte.2013.58.issue-s1-A/bmt-2013-4006/bmt-2013-4006.xml. doi: 10.1515/bmt-2013-4006. [Epub ahead of print] No abstract available. [PubMed]
40. Marcante A, Zanato R, Ferrero M, Zampieri S, Kern H, Stramare R, Gargiulo P, Carraro U, Masiero S. Recovery of Tetanic Contractility of Denervated Muscle: A Step Toward a Walking Aid for Foot Drop. Biomed Tech (Berl). 2013. Sep 7. pii: /j/bmte.2013.58.issue-s1-A/bmt-2013-4016/bmt-2013-4016.xml. doi: 10.1515/bmt-2013-4016. [Epub ahead of print] No abstract available. [PubMed]
41. Kern H, Pelosi L, Coletto L, Musarò A, Sandri M, Vogelauer M, Trimmel L, Cvecka J, Hamar D, Kovarik J, Löfler S, Sarabon N, Protasi F, Adami N, Biral D, Zampieri S, Carraro U. Atrophy/hypertrophy cell signaling in muscles of young athletes trained with vibrational-proprioceptive stimulation. Neurol Res. 2011. Dec;33(10):998–1009. doi: 10.1179/016164110X12767786356633. [PubMed]
42. Gargiulo P, Reynisson PJ, Helgason B, Kern H, Mayr W, Ingvarsson P, Helgason T, Carraro U. Muscle, tendons, and bone: structural changes during denervation and FES treatment. Neurol Res. 2011. Sep;33(7):750–8. doi: 10.1179/1743132811Y.0000000007. [PubMed]
43. Mancinelli R, Kern H, Fulle S, Carraro U, Zampieri S, La Rovere R, Fanò G, Pietrangelo T. Transcriptional profile of denervated vastus lateralis muscle derived from a patient 8 months after spinal cord injury: a case-report. Int J Immunopathol Pharmacol. 2011. Jul-Sep;24(3):749–59. [PubMed]
44. Krenn M, Haller M, Bijak M, Unger E, Hofer C, Kern H, Mayr W. Safe neuromuscular electrical stimulator designed for the elderly. Artif Organs. 2011. Mar;35(3):253–6. doi: 10.1111/j.1525-1594.2011.01217.x. [PubMed]
45. Gargiulo P, Helgason T, Reynisson PJ, Helgason B, Kern H, Mayr W, Ingvarsson P, Carraro U. Monitoring of muscle and bone recovery in spinal cord injury patients treated with electrical stimulation using three-dimensional imaging and segmentation techniques: methodological assessment. Artif Organs. 2011. Mar;35(3):275–81. doi: 10.1111/j.1525-1594.2011.01214.x. [PubMed]
46. Kern H, Carraro U, Adami N, Biral D, Hofer C, Forstner C, Mödlin M, Vogelauer M, Pond A, Boncompagni S, Paolini C, Mayr W, Protasi F, Zampieri S. Home-based functional electrical stimulation rescues permanently denervated muscles in paraplegic patients with complete lower motor neuron lesion. Neurorehabil Neural Repair. 2010. Oct;24(8):709–21. doi: 10.1177/1545968310366129. Epub 2010 May 11. [PubMed]
47. Abruzzo PM, di Tullio S, Marchionni C, Belia S, Fanó G, Zampieri S, Carraro U, Kern H, Sgarbi G, Lenaz G, Marini M. Oxidative stress in the denervated muscle. Free Radic Res. 2010. May;44(5):563–76. doi: 10.3109/10715761003692487. [PubMed]
48. Zampieri S, Valente M, Adami N, Biral D, Ghirardello A, Rampudda ME, Vecchiato M, Sarzo G, Corbianco S, Kern H, Carraro U, Bassetto F, Merigliano S, Doria A. Polymyositis, dermatomyositis and malignancy: a further intriguing link. Autoimmun Rev. 2010. Apr;9(6):449–53. doi: 10.1016/j.autrev.2009.12.005. Epub 2009 Dec 22. Review. [PubMed]
49. Kern H, Kovarik J, Franz C, Vogelauer M, Löfler S, Sarabon N, Grim-Stieger M, Biral D, Adami N, Carraro U, Zampieri S, Hofer Ch. Effects of 8 weeks of vibration training at different frequencies (1 or 15 Hz) in senior sportsmen on torque and force development and of 1 year of training on muscle fibers. Neurol Res. 2010. Feb;32(1):26–31. doi: 10.1179/016164110X12556180206310. [PubMed]
50. Kern H, Carraro U, Adami N, Hofer C, Loefler S, Vogelauer M, Mayr W, Rupp R, Zampieri S. One year of home-based daily FES in complete lower motor neuron paraplegia: recovery of tetanic contractility drives the structural improvements of denervated muscle. Neurol Res. 2010. Feb;32(1):5–12. doi: 10.1179/174313209X385644. [PubMed]
51. Gargiulo P, Kern H, Carraro U, Ingvarsson P, Knútsdóttir S, Gudmundsdóttir V, Yngvason S, Vatnsdal B, Helgason T. Quantitative color three-dimensional computer tomography imaging of human long-term denervated muscle. Neurol Res. 2010. Feb;32(1):13–9. doi: 10.1179/016164109X12536042424171. [PubMed]
52. Nejc S, Jernej R, Loefler S, Kern H. Sensitivity of body sway parameters during quiet standing to manipulation of support surface size. J Sports Sci Med. 2010. Sep 1;9(3):431–8. eCollection 2010. [PMC free article] [PubMed]
53. Squecco R, Carraro U, Kern H, Pond A, Adami N, Biral D, Vindigni V, Boncompagni S, Pietrangelo T, Bosco G, Fanò G, Marini M, Abruzzo PM, Germinario E, Danieli-Betto D, Protasi F, Francini F, Zampieri S. A subpopulation of rat muscle fibers maintains an assessable excitation-contraction coupling mechanism after longstanding denervation despite lost contractility. J Neuropathol Exp Neurol. 2009. Dec;68(12):1256–68. doi: 10.1097/NEN.0b013e3181c18416. [PubMed]
54. Mandl T, Meyerspeer M, Reichel M, Kern H, Hofer C, Mayr W, Moser E. Functional electrical stimulation of long-term denervated, degenerated human skeletal muscle: estimating activation using T2-parameter magnetic resonance imaging methods. Artif Organs. 2008. Aug;32(8):604–8. doi: 10.1111/j.1525-1594.2008.00609.x. [PubMed]
55. Bily W, Trimmel L, Mödlin M, Kaider A, Kern H. Training program and additional electric muscle stimulation for patellofemoral pain syndrome: a pilot study. Arch Phys Med Rehabil. 2008. Jul;89(7):1230–6. doi: 10.1016/j.apmr.2007.10.048. [PubMed]
56. Meyerspeer M, Mandl T, Reichel M, Mayr W, Hofer C, Kern H, Moser E. Effects of functional electrical stimulation in denervated thigh muscles of paraplegic patients mapped with T2 imaging. MAGMA. 2008. May;21(3):219–26. doi: 10.1007/s10334-008-0113-7. Epub 2008 Apr 19. [PMC free article] [PubMed]
57. Biral D, Kern H, Adami N, Boncompagni S, Protasi F, Carraro U. Atrophy-resistant fibers in permanent peripheral denervation of human skeletal muscle. Neurol Res. 2008. Mar;30(2):137–44. doi: 10.1179/174313208X281145. [PubMed]
58. Graupe D, Cerrel-Bazo H, Kern H, Carraro U. Walking performance, medical outcomes and patient training in FES of innervated muscles for ambulation by thoracic-level complete paraplegics. Neurol Res. 2008. Mar;30(2):123–30. doi: 10.1179/174313208X281136. Review. Erratum in: Neurol Res. 2008 Sep;30(7):768-9. [PubMed]
59. Lapalombella R, Kern H, Adami N, Biral D, Zampieri S, Scordari A, di Tullio S, Marini M. Persistence of regenerative myogenesis in spite of down-regulation of activity-dependent genes in long-term denervated rat muscle. Neurol Res. 2008. Mar;30(2):197–206. doi: 10.1179/174313208X281091. [PubMed]
60. Squecco R, Kern H, Biral D, Rossini K, Francini F. Mechano-sensitivity of normal and long term denervated soleus muscle of the rat. Neurol Res. 2008. Mar;30(2):155–9. doi: 10.1179/174313208X281028. [PubMed]
61. Kern H, Hofer C, Mödlin M, Mayr W, Vindigni V, Zampieri S, Boncompagni S, Protasi F, Carraro U. Stable muscle atrophy in long-term paraplegics with complete upper motor neuron lesion from 3- to 20-year SCI. Spinal Cord. 2008. Apr;46(4):293–304. Epub 2007 Oct 23. [PubMed]
62. Kern H, Hofer C, Mödlin M, Mayr W, Vindigni V, Zampieri S, Boncompagni S, Protasi F, Carraro U. Stable muscle atrophy in long-term paraplegics with complete upper motor neuron lesion from 3- to 20-year SCI. Spinal Cord. 2008. Apr;46(4):293–304. Epub 2007 Oct 23. [PubMed]
63. Boncompagni S, Kern H, Rossini K, Hofer C, Mayr W, Carraro U, Protasi F. Structural differentiation of skeletal muscle fibers in the absence of innervation in humans. Proc Natl Acad Sci U S A. 2007. Dec 4;104(49):19339–44. Epub 2007 Nov 27. [PubMed]
64. Minassian K, Persy I, Rattay F, Pinter MM, Kern H, Dimitrijevic MR. Human lumbar cord circuitries can be activated by extrinsic tonic input to generate locomotor-like activity. Hum Mov Sci. 2007. Apr;26(2):275–95. Epub 2007 Mar 6. [PubMed]
65. Minassian K, Persy I, Rattay F, Dimitrijevic MR, Hofer C, Kern H. Posterior root-muscle reflexes elicited by transcutaneous stimulation of the human lumbosacral cord. Muscle Nerve. 2007. Mar;35(3):327–36. [PubMed]
66. Kern H, McKay WB, Dimitrijevic MM, Dimitrijevic MR. Motor control in the human spinal cord and the repair of cord function. Curr Pharm Des. 2005;11(11):1429–39. Review. [PubMed]
67. Bijak M, Rakos M, Hofer C, Mayr W, Strohhofer M, Raschka D, Kern H. Stimulation parameter optimization for FES supported standing up and walking in SCI patients. Artif Organs. 2005. Mar;29(3):220–3. [PubMed]
68. Ashley Z, Sutherland H, Lanmuller H, Unger E, Li F, Mayr W, Kern H, Jarvis JC, Salmons S. Determination of the chronaxie and rheobase of denervated limb muscles in conscious rabbits. Artif Organs 2005. Mar;29(3):212–5. [PubMed]
69. Mödlin M, Forstner C, Hofer C, Mayr W, Richter W, Carraro U, Protasi F, Kern H. Electrical stimulation of denervated muscles: first results of a clinical study. Artif Organs. 2005. Mar;29(3):203–6. [PubMed]
70. Kern H, Rossini K, Carraro U, Mayr W, Vogelauer M, Hoellwarth U, Hofer C. Muscle biopsies show that FES of denervated muscles reverses human muscle degeneration from permanent spinal motoneuron lesion. J Rehabil Res Dev. 2005. May-Jun;42(3 Suppl 1):43–53. [PubMed]
71. Hofer C, Forstner C, Mödlin M, Jäger H, Mayr W, Kern H. In vivo assessment of conduction velocity and refractory period of denervated muscle fibers. Artif Organs. 2005. Jun;29(6):436–9. [PubMed]
72. Dimitrijevic MR, Persy I, Forstner C, Kern H, Dimitrijevic MM. Motor control in the human spinal cord. Artif Organs. 2005. Mar;29(3):216–9. [PubMed]
73. Gallasch E, Rafolt D, Kinz G, Fend M, Kern H, Mayr W. Evaluation of FES-induced knee joint moments in paraplegics with denervated muscles. Artif Organs. 2005. Mar;29(3):207–11. [PubMed]
74. Carraro U, Rossini K, Mayr W, Kern H. Muscle fiber regeneration in human permanent lower motoneuron denervation: relevance to safety and effectiveness of FES-training, which induces muscle recovery in SCI subjects. Artif Organs. 2005. Mar;29(3):187–91. [PubMed]
75. Kern H, Salmons S, Mayr W, Rossini K, Carraro U. Recovery of long-term denervated human muscles induced by electrical stimulation. Muscle Nerve. 2005. Jan;31(1):98–101. [PubMed]
76. Kern H, Boncompagni S, Rossini K, Mayr W, Fanò G, Zanin ME, Podhorska-Okolow M, Protasi F, Carraro U. Long-term denervation in humans causes degeneration of both contractile and excitation-contraction coupling apparatus, which is reversible by functional electrical stimulation (FES): a role for myofiber regeneration? J Neuropathol Exp Neurol. 2004. Sep;63(9):919–31. [PubMed]

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