Article
Engineering, Biomedical
Agah Karakuzu, Arda Arpak, Can A. Yucesoy
Summary: Coupled with diffusion tractography, non-rigid registration of high-resolution anatomical MR images allows for the calculation of local strains along human skeletal muscle fascicles in vivo. The study confirms the consistency of the MRI-DTI analysis workflow and the significance of non-rigid demons algorithm tuning parameters in determining muscle fiber direction strain heterogeneity. The findings demonstrate the robustness of the MRI-DTI method and the consistency of strain heterogeneity patterns along muscle fascicles.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)
Article
Biochemistry & Molecular Biology
Shuang Jiao, Rui Xu, Shaojun Du
Summary: This study highlights the crucial role of Smyd1 in craniofacial and cardiac muscle development, with Smyd1b playing a key role in myosin heavy-chain protein expression and sarcomere organization. Loss of Smyd1b results in severe defects in muscle formation, accompanied by upregulation of stress response markers.
JOURNAL OF GENETICS AND GENOMICS
(2021)
Article
Physiology
Amy N. Adkins, Ryan M. Fong, Julius P. A. Dewald, Wendy M. Murray
Summary: The length of a muscle's sarcomeres is important for its ability to contract and produce force. In the past, the measurement of sarcomere length in living human subjects has been limited to invasive or intraoperative techniques. With the development of second harmonic generation microendoscopy, minimally invasive measurement of sarcomere length has become possible. This imaging technique allows for the study of muscle adaptation due to changes in stimulus, use, or disease. However, there is limited knowledge about the natural, anatomical variability in sarcomere length in living human subjects. This study aims to quantify the experimental uncertainty associated with in vivo measures of sarcomere length.
FRONTIERS IN PHYSIOLOGY
(2022)
Article
Biology
Andrea Monte, Paola Zamparo
Summary: The uncoupling behaviour between muscle belly and fascicle shortening velocity affects mechanical output and metabolic demands. In this study, compressive multidirectional loads were used to manipulate the muscle's capacity to change in shape, and it was found that metabolic power increased as a function of compression intensity.
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
(2023)
Article
Biochemistry & Molecular Biology
Zhexin Wang, Michael Grange, Thorsten Wagner, Ay Lin Kho, Mathias Gautel, Stefan Raunser
Summary: Through electron cryo-tomography, we revealed the molecular architecture of vertebrate skeletal sarcomeres, including the organization and interaction of actin and myosin in the A-band, I-band, and Z-disc, as well as the cross-linking mechanism of alpha-actinin. Additionally, our study identified two conformations of double-head myosin, shedding light on its interaction with actin filaments and splitting between them.
Article
Biophysics
Zhongzheng Wang, Antea Destro, Sven Petersson, Francesco Cenni, Ruoli Wang
Summary: Muscle architecture parameters, such as fascicle length, pennation angle, and volume, play a crucial role in muscle morphology. This study compared the 3D muscle architecture parameters of the tibialis anterior and gastrocnemius medialis using 3D freehand ultrasound (3DfUS) and diffusion tensor imaging (DTI) respectively. The findings showed that 3DfUS measurement had high reliability and repeatability, yielding consistent results with MRI measurements. This suggests that 3DfUS can be considered as an alternative to MRI for evaluating muscle morphology.
JOURNAL OF BIOMECHANICS
(2023)
Article
Sport Sciences
Yi-Chung Lin, Marcus G. Pandy
Summary: This study combined a full-body musculoskeletal model with dynamic optimization theory to predict the biomechanics of maximum-speed sprinting and evaluate the effects of changes in muscle-tendon properties on sprint performance. The results showed that sprint performance was most sensitive to changes in muscle strength and least affected by changes in tendon compliance. Additionally, muscle fascicle length had a greater impact on sprint performance compared to muscle intrinsic maximum shortening velocity.
MEDICINE & SCIENCE IN SPORTS & EXERCISE
(2022)
Article
Physiology
Avery Hinks, Martino V. Franchi, Geoffrey A. Power
Summary: Ultrasound-derived measurements of muscle fascicle length (FL) can overestimate serial sarcomere number (SSN) adaptations by as much as 5%.
EXPERIMENTAL PHYSIOLOGY
(2023)
Review
Sport Sciences
Judd T. Kalkhoven, Mathias Lukauskis-Carvajal, Deborah L. Sides, Blake D. Mclean, Mark L. Watsford
Summary: This article examines different theories about hamstring function during sprinting and highlights the importance of developing and using evidence-based frameworks to guide hamstring training.
Article
Biology
Daniel Porto, Yohei Matsunaga, Barbara Franke, Rhys M. Williams, Hiroshi Qadota, Olga Mayans, Guy M. Benian, Hang Lu
Summary: The study demonstrates the stretch-unfolding of twitchin kinase in active muscle, with mechanical activity regulating the signaling pathway of this cytoskeletal kinase. The developed techniques could be used to obtain in vivo evidence for force-induced conformational changes or elastic behavior of other proteins.
Review
Biochemistry & Molecular Biology
Martijn van de Locht, Tamara C. Borsboom, Josine M. Winter, Coen A. C. Ottenheijm
Summary: Variants in skeletal troponin encoding genes can compromise sarcomere function, with potential therapeutic strategies including troponin activators and gene therapy. The pathophysiological effects of these variants are not fully understood, emphasizing the need for further research into treatment strategies.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Biochemistry & Molecular Biology
Thomas Zacharchenko, Till Dorendorf, Nicolas Locker, Evert Van Dijk, Anja Katzemich, Kay Diederichs, Belinda Bullard, Olga Mayans
Summary: Obscurins are large filamentous proteins that play crucial roles in muscle assembly, stability, and regulation. They contain tandem C-terminal kinase domains, PK1 and PK2, separated by a long intrinsically disordered sequence. PK1 from Drosophila obscurin is found to be a pseudokinase with features of CAM-kinase family, but lacks typical mechanosensory properties. It interacts with PK2, suggesting a functional relation, and the unstructured interkinase segment may now be responsible for mechanosensing properties.
Article
Sport Sciences
B. E. N. J. A. M. I. N. STAEDLE, O. L. I. V. I. E. R. SEYNNES, G. U. I. D. O. LAPS, F. A. B. I. A. N. GOELL, GERT-PETER BRUEGGEMANN, K. I. R. S. T. E. N. ALBRACHT
Summary: The study found that in ATR patients, the affected side had a longer, larger, and stiffer gastrocnemius medialis tendon, shorter muscle fascicles, and greater pennation angles, leading to a deficit in plantarflexion moment. Compensatory remodeling in the affected side may not fully restore muscle function.
MEDICINE & SCIENCE IN SPORTS & EXERCISE
(2021)
Article
Multidisciplinary Sciences
Lauren E. Schultz, Mert Colpan, Garry E. Smith Jr, Rachel M. Mayfield, Tania M. Larrinaga, Alla S. Kostyukova, Carol C. Gregorio
Summary: Actin, a highly expressed protein in eukaryotic cells, plays a vital role in cellular processes. This study found that a mutation in the Lmod3 protein disrupts its structure and function, leading to the development of muscle diseases.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Biotechnology & Applied Microbiology
Chiung Wen Kuo, Feby Wijaya Pratiwi, Yen-Ting Liu, Di-Yen Chueh, Peilin Chen
Summary: Validating the design of nanomaterials in disease models is crucial for the development of bioinspired nanomaterials for therapeutic applications. In this study, a straightforward technique using a two-photon microscope synchronized with electrocardiogram signals was developed for long-term real-time imaging of contracting hearts at the subcellular level. The results showed that the structural and dynamic behaviors of organelles in cardiomyocytes were closely related to heart function. In a myocardial infarction model, impaired cardiac function resulted in decreased sarcomere shortening and increased distances between sarcomeres, along with significant remodeling of the T-tubule structures.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2022)
Article
Engineering, Biomedical
Dimitra Blana, Antonie J. van den Bogert, Wendy M. Murray, Amartya Ganguly, Agamemnon Krasoulis, Kianoush Nazarpour, Edward K. Chadwick
IEEE TRANSACTIONS ON NEURAL SYSTEMS AND REHABILITATION ENGINEERING
(2020)
Review
Pediatrics
Christa M. Nelson, Victoria Marchese, Kelly Rock, Robert M. Henshaw, Odessa Addison
FRONTIERS IN PEDIATRICS
(2020)
Article
Multidisciplinary Sciences
Amy N. Adkins, Wendy M. Murray
JOVE-JOURNAL OF VISUALIZED EXPERIMENTS
(2020)
Article
Pediatrics
Kelly Rock, Christa Nelson, Odessa Addison, Victoria Marchese
Summary: This study assessed the reliability of measuring quadriceps muscle strength and thickness using handheld dynamometry and ultrasonography in children, adolescents, and young adults. The results indicate that the measurements using HHD and ultrasonography are reliable in this population.
PHYSICAL & OCCUPATIONAL THERAPY IN PEDIATRICS
(2021)
Article
Physiology
Amy N. Adkins, Ryan M. Fong, Julius P. A. Dewald, Wendy M. Murray
Summary: The length of a muscle's sarcomeres is important for its ability to contract and produce force. In the past, the measurement of sarcomere length in living human subjects has been limited to invasive or intraoperative techniques. With the development of second harmonic generation microendoscopy, minimally invasive measurement of sarcomere length has become possible. This imaging technique allows for the study of muscle adaptation due to changes in stimulus, use, or disease. However, there is limited knowledge about the natural, anatomical variability in sarcomere length in living human subjects. This study aims to quantify the experimental uncertainty associated with in vivo measures of sarcomere length.
FRONTIERS IN PHYSIOLOGY
(2022)
Article
Sport Sciences
Michael J. Zarro, Matthew G. Stitzlein, Jason S. Lee, Robert W. Rowland, Vicki L. Gray, Jeffrey B. Taylor, Sean J. Meredith, Jonathan D. Packer, Christa M. Nelson
Summary: The study compares limb symmetry index (LSI) between Single Leg Vertical Hop (SLVH) and horizontal hop tests in National Collegiate Athletic Association (NCAA) Division 1 collegiate athletes after ACL reconstruction. The results show that LSI for SLVH is significantly lower than LSI for horizontal hop tests, suggesting that SLVH detects performance deficits not identified by the horizontal hop tests.
INTERNATIONAL JOURNAL OF SPORTS PHYSICAL THERAPY
(2021)
Article
Orthopedics
Kelly Rock, Odessa Addison, Vicki L. Gray, Christa M. Nelson, Robert M. Henshaw, Teresa York, Kathryn Ruble, Victoria Marchese
Summary: The study aimed to explore muscle properties, gross motor performance, and quality of life (QoL) in musculoskeletal sarcoma (MSS) survivors of childhood cancer (CCS), and to assess the changes after a 6-week functional strengthening intervention (PT-STRONG). MSS CCS had lower knee extension strength, muscle thickness, and muscle activation compared to the non-surgical limb. They also exhibited decreased bilateral knee extension strength, gross motor performance, and physical QoL compared to normative values. After PT-STRONG, improvements were observed in muscle thickness, muscle activation, gross motor performance, and physical QoL.
Article
Engineering, Biomedical
Daniel C. McFarland, Benjamin I. Binder-Markey, Jennifer A. Nichols, Sarah J. Wohlman, Marije de Bruin, Wendy M. Murray
Summary: The objective of this study was to develop an open-source musculoskeletal model of the hand and wrist and evaluate its performance in simulating functional tasks. The model accurately reproduced grip force, force distribution, and wrist flexion sensitivity. It also predicted pinch strength and muscle activations during palmar pinch. The simulations of hand opening demonstrated reasonable activations and passive tenodesis-like motion. This work advances the simulation capabilities of hand and wrist models and provides a foundation for future research.
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING
(2023)
Article
Radiology, Nuclear Medicine & Medical Imaging
Divya Joshi, M. Hongchul Sohn, Julius P. A. Dewald, Wendy M. Murray, Carson Ingo
Summary: The purpose of this study was to compare the sensitivity profiles of probabilistic and deterministic DTI tractography methods in estimating geometric properties in arm muscle anatomy. The findings showed that the probabilistic method provided estimates closer to conventional measurements and produced more fascicles compared to the deterministic method. A wide turning angle and lower SNR affected the results of both methods.
MAGNETIC RESONANCE IN MEDICINE
(2023)
Article
Clinical Neurology
Christa M. Nelson, Wendy M. Murray, Julius P. A. Dewald
NEUROREHABILITATION AND NEURAL REPAIR
(2018)