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Horner AM, Azizi E, Roberts TJ. The interaction of in vivo muscle operating lengths and passive stiffness in rat hindlimbs. J Exp Biol 2024; 227:jeb246280. [PMID: 38353270 PMCID: PMC10984277 DOI: 10.1242/jeb.246280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2023] [Accepted: 02/07/2024] [Indexed: 03/12/2024]
Abstract
The operating length of a muscle is a key determinant of its ability to produce force in vivo. Muscles that operate near the peak of their force-length relationship will generate higher forces whereas muscle operating at relatively short length may be safe from sudden lengthening perturbations and subsequent damage. At longer lengths, passive mechanical properties have the potential to contribute to force or constrain operating length with stiffer muscle-tendon units theoretically being restricted to shorter lengths. Connective tissues typically increase in density during aging, thus increasing passive muscle stiffness and potentially limiting the operating lengths of muscle during locomotion. Here, we compare in vivo and in situ muscle strain from the medial gastrocnemius in young (7 months old) and aged (30-32 months old) rats presumed to have varying passive tissue stiffness to test the hypothesis that stiffer muscles operate at shorter lengths relative to their force-length relationship. We measured in vivo muscle operating length during voluntary locomotion on inclines and flat trackways and characterized the muscle force-length relationship of the medial gastrocnemius using fluoromicrometry. Although no age-related results were evident, rats of both age groups demonstrated a clear relationship between passive stiffness and in vivo operating length, such that shorter operating lengths were significantly correlated with greater passive stiffness. Our results suggest that increased passive stiffness may restrict muscles to operating lengths shorter than optimal lengths, potentially limiting force capacity during locomotion.
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Affiliation(s)
- Angela M. Horner
- Department of Biology, California State University, San Bernardino, CA 92407, USA
| | - Emanuel Azizi
- School of Biological Sciences, Department of Ecology and Evolutionary Biology, University of California, Irvine, CA 92697, USA
| | - Thomas J. Roberts
- Division of Biology and Medicine, Brown University, Providence, RI 02912, USA
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2
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Hayashi D, Roemer FW, Tol JL, Heiss R, Crema MD, Jarraya M, Rossi I, Luna A, Guermazi A. Emerging Quantitative Imaging Techniques in Sports Medicine. Radiology 2023; 308:e221531. [PMID: 37552087 DOI: 10.1148/radiol.221531] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/09/2023]
Abstract
This article describes recent advances in quantitative imaging of musculoskeletal extremity sports injuries, citing the existing literature evidence and what additional evidence is needed to make such techniques applicable to clinical practice. Compositional and functional MRI techniques including T2 mapping, diffusion tensor imaging, and sodium imaging as well as contrast-enhanced US have been applied to quantify pathophysiologic processes and biochemical compositions of muscles, tendons, ligaments, and cartilage. Dual-energy and/or spectral CT has shown potential, particularly for the evaluation of osseous and ligamentous injury (eg, creation of quantitative bone marrow edema maps), which is not possible with standard single-energy CT. Recent advances in US technology such as shear-wave elastography or US tissue characterization as well as MR elastography enable the quantification of mechanical, elastic, and physical properties of tissues in muscle and tendon injuries. The future role of novel imaging techniques such as photon-counting CT remains to be established. Eventual prediction of return to play (ie, the time needed for the injury to heal sufficiently so that the athlete can get back to playing their sport) and estimation of risk of repeat injury is desirable to help guide sports physicians in the treatment of their patients. Additional values of quantitative analyses, as opposed to routine qualitative analyses, still must be established using prospective longitudinal studies with larger sample sizes.
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Affiliation(s)
- Daichi Hayashi
- From the Department of Radiology, Tufts Medical Center, Tufts University School of Medicine, Boston, Mass (D.H.); Quantitative Imaging Center, Department of Radiology, Boston University School of Medicine, Boston, Mass (D.H., F.W.R., M.D.C., A.G.); Department of Radiology, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany (F.W.R., R.H.); University of Amsterdam Academic Center for Evidence-based Sports Medicine, Amsterdam, the Netherlands (J.L.T.); Institute of Sports Imaging, French National Institute of Sports, Paris, France (M.D.C.); Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, Mass (M.J.); Centro Rossi, Buenos Aires, Argentina (I.R.); Department of Radiology, HT Medica, Jaén, Spain (A.L.); and Department of Radiology, VA Boston Healthcare System, Boston University School of Medicine, 1400 VFW Parkway, Suite 1B105, West Roxbury, MA 02132 (A.G.)
| | - Frank W Roemer
- From the Department of Radiology, Tufts Medical Center, Tufts University School of Medicine, Boston, Mass (D.H.); Quantitative Imaging Center, Department of Radiology, Boston University School of Medicine, Boston, Mass (D.H., F.W.R., M.D.C., A.G.); Department of Radiology, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany (F.W.R., R.H.); University of Amsterdam Academic Center for Evidence-based Sports Medicine, Amsterdam, the Netherlands (J.L.T.); Institute of Sports Imaging, French National Institute of Sports, Paris, France (M.D.C.); Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, Mass (M.J.); Centro Rossi, Buenos Aires, Argentina (I.R.); Department of Radiology, HT Medica, Jaén, Spain (A.L.); and Department of Radiology, VA Boston Healthcare System, Boston University School of Medicine, 1400 VFW Parkway, Suite 1B105, West Roxbury, MA 02132 (A.G.)
| | - Johannes L Tol
- From the Department of Radiology, Tufts Medical Center, Tufts University School of Medicine, Boston, Mass (D.H.); Quantitative Imaging Center, Department of Radiology, Boston University School of Medicine, Boston, Mass (D.H., F.W.R., M.D.C., A.G.); Department of Radiology, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany (F.W.R., R.H.); University of Amsterdam Academic Center for Evidence-based Sports Medicine, Amsterdam, the Netherlands (J.L.T.); Institute of Sports Imaging, French National Institute of Sports, Paris, France (M.D.C.); Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, Mass (M.J.); Centro Rossi, Buenos Aires, Argentina (I.R.); Department of Radiology, HT Medica, Jaén, Spain (A.L.); and Department of Radiology, VA Boston Healthcare System, Boston University School of Medicine, 1400 VFW Parkway, Suite 1B105, West Roxbury, MA 02132 (A.G.)
| | - Rafael Heiss
- From the Department of Radiology, Tufts Medical Center, Tufts University School of Medicine, Boston, Mass (D.H.); Quantitative Imaging Center, Department of Radiology, Boston University School of Medicine, Boston, Mass (D.H., F.W.R., M.D.C., A.G.); Department of Radiology, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany (F.W.R., R.H.); University of Amsterdam Academic Center for Evidence-based Sports Medicine, Amsterdam, the Netherlands (J.L.T.); Institute of Sports Imaging, French National Institute of Sports, Paris, France (M.D.C.); Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, Mass (M.J.); Centro Rossi, Buenos Aires, Argentina (I.R.); Department of Radiology, HT Medica, Jaén, Spain (A.L.); and Department of Radiology, VA Boston Healthcare System, Boston University School of Medicine, 1400 VFW Parkway, Suite 1B105, West Roxbury, MA 02132 (A.G.)
| | - Michel D Crema
- From the Department of Radiology, Tufts Medical Center, Tufts University School of Medicine, Boston, Mass (D.H.); Quantitative Imaging Center, Department of Radiology, Boston University School of Medicine, Boston, Mass (D.H., F.W.R., M.D.C., A.G.); Department of Radiology, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany (F.W.R., R.H.); University of Amsterdam Academic Center for Evidence-based Sports Medicine, Amsterdam, the Netherlands (J.L.T.); Institute of Sports Imaging, French National Institute of Sports, Paris, France (M.D.C.); Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, Mass (M.J.); Centro Rossi, Buenos Aires, Argentina (I.R.); Department of Radiology, HT Medica, Jaén, Spain (A.L.); and Department of Radiology, VA Boston Healthcare System, Boston University School of Medicine, 1400 VFW Parkway, Suite 1B105, West Roxbury, MA 02132 (A.G.)
| | - Mohamed Jarraya
- From the Department of Radiology, Tufts Medical Center, Tufts University School of Medicine, Boston, Mass (D.H.); Quantitative Imaging Center, Department of Radiology, Boston University School of Medicine, Boston, Mass (D.H., F.W.R., M.D.C., A.G.); Department of Radiology, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany (F.W.R., R.H.); University of Amsterdam Academic Center for Evidence-based Sports Medicine, Amsterdam, the Netherlands (J.L.T.); Institute of Sports Imaging, French National Institute of Sports, Paris, France (M.D.C.); Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, Mass (M.J.); Centro Rossi, Buenos Aires, Argentina (I.R.); Department of Radiology, HT Medica, Jaén, Spain (A.L.); and Department of Radiology, VA Boston Healthcare System, Boston University School of Medicine, 1400 VFW Parkway, Suite 1B105, West Roxbury, MA 02132 (A.G.)
| | - Ignacio Rossi
- From the Department of Radiology, Tufts Medical Center, Tufts University School of Medicine, Boston, Mass (D.H.); Quantitative Imaging Center, Department of Radiology, Boston University School of Medicine, Boston, Mass (D.H., F.W.R., M.D.C., A.G.); Department of Radiology, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany (F.W.R., R.H.); University of Amsterdam Academic Center for Evidence-based Sports Medicine, Amsterdam, the Netherlands (J.L.T.); Institute of Sports Imaging, French National Institute of Sports, Paris, France (M.D.C.); Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, Mass (M.J.); Centro Rossi, Buenos Aires, Argentina (I.R.); Department of Radiology, HT Medica, Jaén, Spain (A.L.); and Department of Radiology, VA Boston Healthcare System, Boston University School of Medicine, 1400 VFW Parkway, Suite 1B105, West Roxbury, MA 02132 (A.G.)
| | - Antonio Luna
- From the Department of Radiology, Tufts Medical Center, Tufts University School of Medicine, Boston, Mass (D.H.); Quantitative Imaging Center, Department of Radiology, Boston University School of Medicine, Boston, Mass (D.H., F.W.R., M.D.C., A.G.); Department of Radiology, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany (F.W.R., R.H.); University of Amsterdam Academic Center for Evidence-based Sports Medicine, Amsterdam, the Netherlands (J.L.T.); Institute of Sports Imaging, French National Institute of Sports, Paris, France (M.D.C.); Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, Mass (M.J.); Centro Rossi, Buenos Aires, Argentina (I.R.); Department of Radiology, HT Medica, Jaén, Spain (A.L.); and Department of Radiology, VA Boston Healthcare System, Boston University School of Medicine, 1400 VFW Parkway, Suite 1B105, West Roxbury, MA 02132 (A.G.)
| | - Ali Guermazi
- From the Department of Radiology, Tufts Medical Center, Tufts University School of Medicine, Boston, Mass (D.H.); Quantitative Imaging Center, Department of Radiology, Boston University School of Medicine, Boston, Mass (D.H., F.W.R., M.D.C., A.G.); Department of Radiology, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany (F.W.R., R.H.); University of Amsterdam Academic Center for Evidence-based Sports Medicine, Amsterdam, the Netherlands (J.L.T.); Institute of Sports Imaging, French National Institute of Sports, Paris, France (M.D.C.); Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, Mass (M.J.); Centro Rossi, Buenos Aires, Argentina (I.R.); Department of Radiology, HT Medica, Jaén, Spain (A.L.); and Department of Radiology, VA Boston Healthcare System, Boston University School of Medicine, 1400 VFW Parkway, Suite 1B105, West Roxbury, MA 02132 (A.G.)
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3
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Toniolo L, Concato M, Giacomello E. Resveratrol, a Multitasking Molecule That Improves Skeletal Muscle Health. Nutrients 2023; 15:3413. [PMID: 37571349 PMCID: PMC10421121 DOI: 10.3390/nu15153413] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 07/29/2023] [Accepted: 07/30/2023] [Indexed: 08/13/2023] Open
Abstract
Resveratrol is a natural polyphenol utilized in Chinese traditional medicine and thought to be one of the determinants of the "French Paradox". More recently, some groups evidenced its properties as a calorie-restriction mimetic, suggesting that its action passes through the modulation of skeletal muscle metabolism. Accordingly, the number of studies reporting the beneficial effects of resveratrol on skeletal muscle form and function, in both experimental models and humans, is steadily increasing. Although studies on animal models confer to resveratrol a good potential to ameliorate skeletal muscle structure, function and performance, clinical trials still do not provide clear-cut information. Here, we first summarize the effects of resveratrol on the distinct components of the skeletal muscle, such as myofibers, the neuromuscular junction, tendons, connective sheaths and the capillary bed. Second, we review clinical trials focused on the analysis of skeletal muscle parameters. We suggest that the heterogeneity in the response to resveratrol in humans could depend on sample characteristics, treatment modalities and parameters analyzed; as well, this heterogeneity could possibly reside in the complexity of skeletal muscle physiology. A systematic programming of treatment protocols and analyses could be helpful to obtain consistent results in clinical trials involving resveratrol administration.
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Affiliation(s)
- Luana Toniolo
- Laboratory of Muscle Biophysics, Department of Biomedical Sciences, University of Padova, 35131 Padova, Italy
| | - Monica Concato
- Department of Medicine, Surgery and Health Sciences, University of Trieste, 34149 Trieste, Italy;
| | - Emiliana Giacomello
- Department of Medicine, Surgery and Health Sciences, University of Trieste, 34149 Trieste, Italy;
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4
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Nieves-Rodriguez S, Barthélémy F, Woods JD, Douine ED, Wang RT, Scripture-Adams DD, Chesmore KN, Galasso F, Miceli MC, Nelson SF. Transcriptomic analysis of paired healthy human skeletal muscles to identify modulators of disease severity in DMD. Front Genet 2023; 14:1216066. [PMID: 37576554 PMCID: PMC10415210 DOI: 10.3389/fgene.2023.1216066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2023] [Accepted: 07/04/2023] [Indexed: 08/15/2023] Open
Abstract
Muscle damage and fibro-fatty replacement of skeletal muscles is a main pathologic feature of Duchenne muscular dystrophy (DMD) with more proximal muscles affected earlier and more distal affected later in the disease course, suggesting that different skeletal muscle groups possess distinctive characteristics that influence their susceptibility to disease. To explore transcriptomic factors driving differential gene expression and modulating DMD skeletal muscle severity, we characterized the transcriptome of vastus lateralis (VL), a more proximal and susceptible muscle, relative to tibialis anterior (TA), a more distal and protected muscle, in 15 healthy individuals using bulk RNA sequencing to identify gene expression differences that may mediate their relative susceptibility to damage with loss of dystrophin. Matching single nuclei RNA sequencing data was generated for 3 of the healthy individuals, to infer cell composition in the bulk RNA sequencing dataset and to improve mapping of differentially expressed genes to their cell source of expression. A total of 3,410 differentially expressed genes were identified and mapped to cell type using single nuclei RNA sequencing of muscle, including long non-coding RNAs and protein coding genes. There was an enrichment of genes involved in calcium release from the sarcoplasmic reticulum, particularly in the myofibers and these myofiber genes were higher in the VL. There was an enrichment of genes in "Collagen-Containing Extracellular Matrix" expressed by fibroblasts, endothelial, smooth muscle and pericytes, with most genes higher in the TA, as well as genes in "Regulation Of Apoptotic Process" expressed across all cell types. Previously reported genetic modifiers were also enriched within the differentially expressed genes. We also identify 6 genes with differential isoform usage between the VL and TA. Lastly, we integrate our findings with DMD RNA sequencing data from the TA, and identify "Collagen-Containing Extracellular Matrix" and "Negative Regulation Of Apoptotic Process" as differentially expressed between DMD compared to healthy. Collectively, these findings propose novel candidate mechanisms that may mediate differential muscle susceptibility in muscular dystrophies and provide new insight into potential therapeutic targets.
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Affiliation(s)
- Shirley Nieves-Rodriguez
- Department of Human Genetics, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
- Center for Duchenne Muscular Dystrophy at UCLA, Los Angeles, CA, United States
| | - Florian Barthélémy
- Center for Duchenne Muscular Dystrophy at UCLA, Los Angeles, CA, United States
- Department of Microbiology, David Geffen School of Medicine and College of Letters and Sciences, University of California, Los Angeles, Los Angeles, CA, United States
| | - Jeremy D. Woods
- Department of Pediatrics, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
| | - Emilie D. Douine
- Center for Duchenne Muscular Dystrophy at UCLA, Los Angeles, CA, United States
- Department of Neurology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
| | - Richard T. Wang
- Department of Human Genetics, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
- Center for Duchenne Muscular Dystrophy at UCLA, Los Angeles, CA, United States
| | - Deirdre D. Scripture-Adams
- Center for Duchenne Muscular Dystrophy at UCLA, Los Angeles, CA, United States
- Department of Microbiology, David Geffen School of Medicine and College of Letters and Sciences, University of California, Los Angeles, Los Angeles, CA, United States
| | - Kevin N. Chesmore
- Department of Human Genetics, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
- Center for Duchenne Muscular Dystrophy at UCLA, Los Angeles, CA, United States
| | - Francesca Galasso
- Department of Human Genetics, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
| | - M. Carrie Miceli
- Center for Duchenne Muscular Dystrophy at UCLA, Los Angeles, CA, United States
- Department of Microbiology, David Geffen School of Medicine and College of Letters and Sciences, University of California, Los Angeles, Los Angeles, CA, United States
| | - Stanley F. Nelson
- Department of Human Genetics, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
- Center for Duchenne Muscular Dystrophy at UCLA, Los Angeles, CA, United States
- Department of Neurology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
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5
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Pirri C, Pirri N, Guidolin D, Macchi V, Porzionato A, De Caro R, Stecco C. Ultrasound Imaging of Thoracolumbar Fascia Thickness: Chronic Non-Specific Lower Back Pain versus Healthy Subjects; A Sign of a "Frozen Back"? Diagnostics (Basel) 2023; 13:diagnostics13081436. [PMID: 37189537 DOI: 10.3390/diagnostics13081436] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2023] [Revised: 03/27/2023] [Accepted: 04/14/2023] [Indexed: 05/17/2023] Open
Abstract
The thoracolumbar fascia (TLF) plays an important role in lower back pain (LBP). Recent studies have revealed an association between increases in TLF thickness and reduced TLF gliding in patients with LBP. The purpose of this study was to measure and compare by ultrasound (US) imaging the thickness of the TLF at the bilateral L3 level of the lumbar spine in the longitudinal and transverse axes in chronic non-specific LBP and in healthy subjects. A cross-sectional study was performed using US imaging to measure the longitudinal and transverse axes with a new protocol in a sample of 92 subjects: 46 chronic non-specific LBP patients and 46 healthy participants. The findings for TLF thickness revealed statistically significant differences (p < 0.05) in the longitudinal and transverse axes between the two groups. Moreover, in the healthy group, a statistically significant difference was found between the longitudinal and transverse axes (p = 0.001 for left and p = 0.02 for right), which was not evident in the LBP patients. These findings suggest that the LBP patients lost anisotropy of the TLF, with it becoming homogeneously thicker and losing adaptability in the transversal direction. The US imaging evaluation suggests that TLF thickness behavior points out altered fascial remodelling compared to healthy subjects, a sort of "frozen back".
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Affiliation(s)
- Carmelo Pirri
- Department of Neurosciences, Institute of Human Anatomy, University of Padua, 35121 Padua, Italy
| | - Nina Pirri
- Department of Medicine-DIMED, School of Radiology, Radiology Institute, University of Padua, 35121 Padova, Italy
| | - Diego Guidolin
- Department of Neurosciences, Institute of Human Anatomy, University of Padua, 35121 Padua, Italy
| | - Veronica Macchi
- Department of Neurosciences, Institute of Human Anatomy, University of Padua, 35121 Padua, Italy
| | - Andrea Porzionato
- Department of Neurosciences, Institute of Human Anatomy, University of Padua, 35121 Padua, Italy
| | - Raffaele De Caro
- Department of Neurosciences, Institute of Human Anatomy, University of Padua, 35121 Padua, Italy
| | - Carla Stecco
- Department of Neurosciences, Institute of Human Anatomy, University of Padua, 35121 Padua, Italy
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Boyer KA, Hayes KL, Umberger BR, Adamczyk PG, Bean JF, Brach JS, Clark BC, Clark DJ, Ferrucci L, Finley J, Franz JR, Golightly YM, Hortobágyi T, Hunter S, Narici M, Nicklas B, Roberts T, Sawicki G, Simonsick E, Kent JA. Age-related changes in gait biomechanics and their impact on the metabolic cost of walking: Report from a National Institute on Aging workshop. Exp Gerontol 2023; 173:112102. [PMID: 36693530 PMCID: PMC10008437 DOI: 10.1016/j.exger.2023.112102] [Citation(s) in RCA: 16] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Revised: 01/09/2023] [Accepted: 01/19/2023] [Indexed: 01/22/2023]
Abstract
Changes in old age that contribute to the complex issue of an increased metabolic cost of walking (mass-specific energy cost per unit distance traveled) in older adults appear to center at least in part on changes in gait biomechanics. However, age-related changes in energy metabolism, neuromuscular function and connective tissue properties also likely contribute to this problem, of which the consequences are poor mobility and increased risk of inactivity-related disease and disability. The U.S. National Institute on Aging convened a workshop in September 2021 with an interdisciplinary group of scientists to address the gaps in research related to the mechanisms and consequences of changes in mobility in old age. The goal of the workshop was to identify promising ways to move the field forward toward improving gait performance, decreasing energy cost, and enhancing mobility for older adults. This report summarizes the workshop and brings multidisciplinary insight into the known and potential causes and consequences of age-related changes in gait biomechanics. We highlight how gait mechanics and energy cost change with aging, the potential neuromuscular mechanisms and role of connective tissue in these changes, and cutting-edge interventions and technologies that may be used to measure and improve gait and mobility in older adults. Key gaps in the literature that warrant targeted research in the future are identified and discussed.
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Affiliation(s)
- Katherine A Boyer
- Department of Kinesiology, University of Massachusetts Amherst, MA, USA; Department of Orthopedics and Physical Rehabilitation, University of Massachusetts Medical School, Worcester, MA, USA.
| | - Kate L Hayes
- Department of Kinesiology, University of Massachusetts Amherst, MA, USA
| | | | | | - Jonathan F Bean
- New England GRECC, VA Boston Healthcare System, Boston, MA, USA; Department of PM&R, Harvard Medical School, Boston, MA, USA; Spaulding Rehabilitation Hospital, Boston, MA, USA
| | - Jennifer S Brach
- Department of Physical Therapy, University of Pittsburgh, Pittsburgh, PA, USA
| | - Brian C Clark
- Ohio Musculoskeletal and Neurological Institute and the Department of Biomedical Sciences, Ohio University, Athens, OH, USA
| | - David J Clark
- Brain Rehabilitation Research Center, Malcom Randall VA Medical Center, Gainesville, FL, USA; Department of Physiology and Aging, University of Florida, Gainesville, FL, USA
| | - Luigi Ferrucci
- Intramural Research Program of the National Institute on Aging, NIH, Baltimore, MD, USA
| | - James Finley
- Division of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles, CA, USA
| | - Jason R Franz
- Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University, Chapel Hill, NC, USA
| | - Yvonne M Golightly
- College of Allied Health Professions, University of Nebraska Medical Center, Omaha, NE, USA; Thurston Arthritis Research Center, Division of Rheumatology, Allergy, and Immunology, Department of Medicine, University of North Carolina, Chapel Hill, NC, USA
| | - Tibor Hortobágyi
- Hungarian University of Sports Science, Department of Kinesiology, Budapest, Hungary; Institute of Sport Sciences and Physical Education, University of Pécs, Hungary; Somogy County Kaposi Mór Teaching Hospital, Kaposvár, Hungary; Center for Human Movement Sciences, University of Groningen Medical Center, Groningen, the Netherlands
| | - Sandra Hunter
- Department of Physical Therapy, Marquette University, Milwaukee, WI, USA
| | - Marco Narici
- Neuromuscular Physiology Laboratory, Department of Biomedical Sciences, University of Padova, Padova, Italy
| | - Barbara Nicklas
- Section on Gerontology and Geriatric Medicine, Wake Forest University School of Medicine, USA
| | - Thomas Roberts
- Department of Ecology and Evolutionary Biology, Brown University, USA
| | - Gregory Sawicki
- George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, USA
| | - Eleanor Simonsick
- Intramural Research Program of the National Institute on Aging, NIH, Baltimore, MD, USA
| | - Jane A Kent
- Department of Kinesiology, University of Massachusetts Amherst, MA, USA
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7
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He X, Taneja K, Chen JS, Lee CH, Hodgson J, Malis V, Sinha U, Sinha S. Multiscale modeling of passive material influences on deformation and force output of skeletal muscles. INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2022; 38:e3571. [PMID: 35049153 DOI: 10.1002/cnm.3571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 12/06/2021] [Accepted: 01/15/2022] [Indexed: 06/14/2023]
Abstract
Passive materials in human skeletal muscle tissues play an important role in force output of skeletal muscles. This paper introduces a multiscale modeling framework to investigate how age-associated variations on microscale passive muscle components, including microstructural geometry (e.g., connective tissue thickness) and material properties (e.g., anisotropy), influence the force output and deformations of the continuum skeletal muscle. We first define a representative volume element (RVE) for the microstructure of muscle and determine the homogenized macroscale mechanical properties of the RVE from the separate mechanical properties of the individual components of the RVE, including muscle fibers and connective tissue with its associated collagen fibers. The homogenized properties of the RVE are then used to define the elements of the continuum muscle model to evaluate the force output and deformations of the whole muscle. Conversely, the regional deformations of the continuum model are fed back to the RVE model to determine the responses of the individual microscale components. Simulations of muscle isometric contractions at a range of muscle lengths are performed to investigate the effects of muscle architectural changes (e.g., pennation angles) due to aging on force output and muscle deformation. The correlations between the pennation angle, the shear deformation in the microscale connective tissue (an indicator for the lateral force transmission), the angle difference between the fiber direction and principal strain direction and the resulting shear deformation at the continuum scale, as well as the force output of the skeletal muscle are also discussed.
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Affiliation(s)
- Xiaolong He
- Department of Structural Engineering, University of California San Diego, San Diego, California, USA
| | - Karan Taneja
- Department of Structural Engineering, University of California San Diego, San Diego, California, USA
| | - Jiun-Shyan Chen
- Department of Structural Engineering, University of California San Diego, San Diego, California, USA
| | - Chung-Hao Lee
- School of Aerospace and Mechanical Engineering, The University of Oklahoma, Norman, Oklahoma, USA
| | - John Hodgson
- Department of Integrative Biology and Physiology, University of California Los Angeles, Los Angeles, California, USA
| | - Vadim Malis
- Department of Physics, University of California San Diego, San Diego, California, USA
- Department of Radiology, University of California San Diego, San Diego, California, USA
| | - Usha Sinha
- Department of Physics, San Diego State University, San Diego, California, USA
| | - Shantanu Sinha
- Department of Radiology, University of California San Diego, San Diego, California, USA
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Manzano W, Lenchik L, Chaudhari AS, Yao L, Gupta S, Boutin RD. Sarcopenia in rheumatic disorders: what the radiologist and rheumatologist should know. Skeletal Radiol 2022; 51:513-524. [PMID: 34268590 DOI: 10.1007/s00256-021-03863-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Revised: 07/03/2021] [Accepted: 07/04/2021] [Indexed: 02/02/2023]
Abstract
Sarcopenia is defined as the loss of muscle mass, strength, and function. Increasing evidence shows that sarcopenia is common in patients with rheumatic disorders. Although sarcopenia can be diagnosed using bioelectrical impedance analysis or DXA, increasingly it is diagnosed using CT, MRI, and ultrasound. In rheumatic patients, CT and MRI allow "opportunistic" measurement of body composition, including surrogate markers of sarcopenia, from studies obtained during routine patient care. Recognition of sarcopenia is important in rheumatic patients because sarcopenia can be associated with disease progression and poor outcomes. This article reviews how opportunistic evaluation of sarcopenia in rheumatic patients can be accomplished and potentially contribute to improved patient care.
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Affiliation(s)
- Wilfred Manzano
- Department of Radiology, Stanford University School of Medicine, Stanford, CA, 94305-5105, USA.
| | - Leon Lenchik
- Department of Radiology, Wake Forest School of Medicine, Winston-Salem, NC, 27157, USA
| | - Akshay S Chaudhari
- Department of Radiology, Stanford University School of Medicine, Stanford, CA, 94305-5105, USA
| | - Lawrence Yao
- Department of Radiology, National Institute of Health, Bethesda, MD, 20892, USA
| | - Sarthak Gupta
- Department of Medicine, National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), National Institutes of Health, Bethesda, MD, 20892, USA
| | - Robert D Boutin
- Department of Radiology, Stanford University School of Medicine, Stanford, CA, 94305-5105, USA
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Noehren B, Hardy PA, Andersen A, Brightwell CR, Fry JL, Vandsburger MH, Thompson KL, Fry CS. T1ρ imaging as a non-invasive assessment of collagen remodelling and organization in human skeletal muscle after ligamentous injury. J Physiol 2021; 599:5229-5242. [PMID: 34714551 PMCID: PMC8764566 DOI: 10.1113/jp281964] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Accepted: 10/12/2021] [Indexed: 11/08/2022] Open
Abstract
Dysregulation and fibrosis of the extracellular matrix (ECM) in skeletal muscle is a consequence of injury. Current ECM assessment necessitates muscle biopsies to evaluate alterations to the muscle ECM, which is often not practical in humans. The goal of this study was to evaluate the potential of a magnetic resonance imaging sequence that quantifies T1ρ relaxation time to predict ECM collagen composition and organization. T1ρ imaging was performed and muscle biopsies obtained from the involved and non-involved vastus lateralis muscle on 27 subjects who had an anterior cruciate ligament (ACL) tear. T1ρ times were quantified via monoexponential decay curve fitted to a series of T1ρ-weighted images. Several ECM indices, including collagen content and organization, were obtained using immunohistochemistry and histochemistry in addition to hydroxyproline. Model selection with multiple linear regression was used to evaluate the relationships between T1ρ times and ECM composition. Additionally, the ACL-deficient and healthy limb were compared to determine sensitivity of T1ρ to detect early adaptations in the muscle ECM following injury. We show that T1ρ relaxation time was strongly associated with collagen unfolding (t = 4.093, P = 0.0007) in the ACL-deficient limb, and collagen 1 abundance in the healthy limb (t = 2.75, P = 0.014). In addition, we show that T1ρ relaxation time is significantly longer in the injured limb, coinciding with significant differences in several indices of collagen content and remodelling in the ACL-deficient limb. These results support the use of T1ρ to evaluate ECM composition in skeletal muscle in a non-invasive manner. KEY POINTS: Dysregulation and fibrotic transformation of the skeletal muscle extracellular matrix (ECM) is a common pathology associated with injury and ageing. Studies of the muscle ECM in humans have necessitated the use of biopsies, which are impractical in many settings. Non-invasive MRI T1ρ relaxation time was validated to predict ECM collagen composition and organization with aligned T1ρ imaging and biopsies of the vastus lateralis in the healthy limb and anterior cruciate ligament (ACL)-deficient limb of 27 subjects. T1ρ relaxation time was strongly associated with collagen abundance and unfolding in the ACL-deficient limb, and T1ρ relaxation time was strongly associated with total collagen abundance in the healthy limb. T1ρ relaxation time was significantly longer in the ACL-deficient limb, coinciding with significant increases in several indices of muscle collagen content and remodelling supporting the use of T1ρ to non-invasively evaluate ECM composition and pathology in skeletal muscle.
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Affiliation(s)
- Brian Noehren
- Department of Physical Therapy, University of Kentucky, Lexington, KY, USA
- Department of Orthopaedic Surgery and Sports Medicine, University of Kentucky, Lexington, KY, USA
- Center for Muscle Biology, University of Kentucky, Lexington, KY, USA
| | - Peter A Hardy
- Department of Radiology, University of Kentucky, Lexington, KY, USA
- Magnetic Resonance Imaging and Spectroscopy Center, University of Kentucky, Lexington, KY, USA
| | - Anders Andersen
- Magnetic Resonance Imaging and Spectroscopy Center, University of Kentucky, Lexington, KY, USA
- Department of Anatomy and Neurobiology, University of Kentucky, Lexington, KY, USA
| | - Camille R Brightwell
- Center for Muscle Biology, University of Kentucky, Lexington, KY, USA
- Department of Athletic Training and Clinical Nutrition, University of Kentucky, Lexington, KY, USA
| | - Jean L Fry
- Center for Muscle Biology, University of Kentucky, Lexington, KY, USA
- Department of Athletic Training and Clinical Nutrition, University of Kentucky, Lexington, KY, USA
| | - Moriel H Vandsburger
- Department of Bioengineering, University of California at Berkeley, Berkeley, CA, USA
| | | | - Christopher S Fry
- Center for Muscle Biology, University of Kentucky, Lexington, KY, USA
- Department of Athletic Training and Clinical Nutrition, University of Kentucky, Lexington, KY, USA
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10
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Carraro U, Yablonka-Reuveni Z. Translational research on Myology and Mobility Medicine: 2021 semi-virtual PDM3 from Thermae of Euganean Hills, May 26 - 29, 2021. Eur J Transl Myol 2021; 31:9743. [PMID: 33733717 PMCID: PMC8056169 DOI: 10.4081/ejtm.2021.9743] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Accepted: 03/17/2021] [Indexed: 02/08/2023] Open
Abstract
On 19-21 November 2020, the meeting of the 30 years of the Padova Muscle Days was virtually held while the SARS-CoV-2 epidemic was hitting the world after a seemingly quiet summer. During the 2020-2021 winter, the epidemic is still active, despite the start of vaccinations. The organizers hope to hold the 2021 Padua Days on Myology and Mobility Medicine in a semi-virtual form (2021 S-V PDM3) from May 26 to May 29 at the Thermae of Euganean Hills, Padova, Italy. Here the program and the Collection of Abstracts are presented. Despite numerous world problems, the number of submitted/selected presentations (lectures and oral presentations) has increased, prompting the organizers to extend the program to four dense days.
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Affiliation(s)
- Ugo Carraro
- Department of Biomedical Sciences of the University of Padova, Italy; CIR-Myo - Myology Centre, University of Padova, Italy; A-C Mioni-Carraro Foundation for Translational Myology, Padova.
| | - Zipora Yablonka-Reuveni
- Department of Biological Structure, University of Washington School of Medicine, Seattle, WA.
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11
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Gao Y, Lu Z, Lyu X, Liu Q, Pan S. A Longitudinal Study of T2 Mapping Combined With Diffusion Tensor Imaging to Quantitatively Evaluate Tissue Repair of Rat Skeletal Muscle After Frostbite. Front Physiol 2021; 11:597638. [PMID: 33569011 PMCID: PMC7868413 DOI: 10.3389/fphys.2020.597638] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Accepted: 12/30/2020] [Indexed: 11/30/2022] Open
Abstract
Purpose: T2 mapping and diffusion tensor imaging (DTI) enable the detection of changes in the skeletal muscle microenvironment. We assessed T2 relaxation times, DTI metrics, performed histological characterization of frostbite-induced skeletal muscle injury and repair, and provided diagnostic imaging biomarkers. Design and Methods: Thirty-six Sprague Dawley rats (200 ± 10 g) were obtained. Thirty rats were used for establishing a skeletal muscle frostbite model, and six were untreated controls. Functional MR sequences were performed on rats on days 0, 3, 5, 10, and 14 (n = 6 per time point). Rats were then sacrificed to obtain the quadriceps muscles. Tensor eigenvalues (λ1, λ2, and λ3), mean diffusivity (MD), fractional anisotropy (FA), and T2 values were compared between the frostbite model and control rats. ImageJ was used to measure the extracellular area fraction (EAF), muscle fiber cross-sectional area (fCSA), and skeletal muscle tumor necrosis factor α (TNF-α), and Myod1 expression. The correlation between the histological and imaging parameters of the frostbitten skeletal muscle was evaluated. Kolmogorov–Smirnoff test, Leven’s test, one-way ANOVA, and Spearman coefficient were used for analysis. Results: T2 relaxation time of frostbitten skeletal muscle was higher at all time points (p < 0.01). T2 relaxation time correlated with EAF, and TNF-α and Myod1 expression (r = 0.42, p < 0.05; r = 0.86, p < 0.01; r = 0.84, p < 0.01). The average tensor metrics (MD, λ1, λ2, and λ3) of skeletal muscle at 3 and 5 days of frostbite increased (p < 0.05), and fCSA correlated with λ1, λ2, and λ3, and MD (r = 0.65, p < 0.01; r = 0.48, p < 0.01; r = 0.52, p < 0.01; r = 0.62, p < 0.01). Conclusion: T2 mapping and DTI imaging detect frostbite-induced skeletal muscle injury early. This combined approach can quantitatively assess skeletal muscle repair and regeneration within 2 weeks of frostbite. Imaging biomarkers for the diagnosis of frostbite were suggested.
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Affiliation(s)
- Yue Gao
- Department of Radiology, Shengjing Hospital of China Medical University, Shenyang, China
| | - Zhao Lu
- Department of Radiology, Shengjing Hospital of China Medical University, Shenyang, China
| | - Xiaohong Lyu
- Department of Radiology, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou, China
| | - Qiang Liu
- Department of Radiology, Shengjing Hospital of China Medical University, Shenyang, China
| | - Shinong Pan
- Department of Radiology, Shengjing Hospital of China Medical University, Shenyang, China
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van Gastel J, Leysen H, Boddaert J, Vangenechten L, Luttrell LM, Martin B, Maudsley S. Aging-related modifications to G protein-coupled receptor signaling diversity. Pharmacol Ther 2020; 223:107793. [PMID: 33316288 DOI: 10.1016/j.pharmthera.2020.107793] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Accepted: 11/26/2020] [Indexed: 02/06/2023]
Abstract
Aging is a highly complex molecular process, affecting nearly all tissue systems in humans and is the highest risk factor in developing neurodegenerative disorders such as Alzheimer's and Parkinson's disease, cardiovascular disease and Type 2 diabetes mellitus. The intense complexity of the aging process creates an incentive to develop more specific drugs that attenuate or even reverse some of the features of premature aging. As our current pharmacopeia is dominated by therapeutics that target members of the G protein-coupled receptor (GPCR) superfamily it may be prudent to search for effective anti-aging therapeutics in this fertile domain. Since the first demonstration of GPCR-based β-arrestin signaling, it has become clear that an enhanced appreciation of GPCR signaling diversity may facilitate the creation of therapeutics with selective signaling activities. Such 'biased' ligand signaling profiles can be effectively investigated using both standard molecular biological techniques as well as high-dimensionality data analyses. Through a more nuanced appreciation of the quantitative nature across the multiple dimensions of signaling bias that drugs possess, researchers may be able to further refine the efficacy of GPCR modulators to impact the complex aberrations that constitute the aging process. Identifying novel effector profiles could expand the effective pharmacopeia and assist in the design of precision medicines. This review discusses potential non-G protein effectors, and specifically their potential therapeutic suitability in aging and age-related disorders.
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Affiliation(s)
- Jaana van Gastel
- Receptor Biology Lab, Department of Biomedical Sciences, University of Antwerp, Antwerp, Belgium; Faculty of Pharmacy, Biomedical and Veterinary Science, University of Antwerp, Antwerp, Belgium
| | - Hanne Leysen
- Receptor Biology Lab, Department of Biomedical Sciences, University of Antwerp, Antwerp, Belgium; Faculty of Pharmacy, Biomedical and Veterinary Science, University of Antwerp, Antwerp, Belgium
| | - Jan Boddaert
- Molecular Pathology Group, Faculty of Medicine and Health Sciences, Laboratory of Cell Biology and Histology, Antwerp, Belgium
| | - Laura Vangenechten
- Receptor Biology Lab, Department of Biomedical Sciences, University of Antwerp, Antwerp, Belgium
| | - Louis M Luttrell
- Division of Endocrinology, Diabetes & Medical Genetics, Medical University of South Carolina, USA
| | - Bronwen Martin
- Faculty of Pharmacy, Biomedical and Veterinary Science, University of Antwerp, Antwerp, Belgium
| | - Stuart Maudsley
- Receptor Biology Lab, Department of Biomedical Sciences, University of Antwerp, Antwerp, Belgium; Faculty of Pharmacy, Biomedical and Veterinary Science, University of Antwerp, Antwerp, Belgium.
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