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9,798 results for “muscles”
Haptic artificial muscle skin for extended reality
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Sex linkage of the skeletal muscle sodium channel gene (SCN4A) explains apparent deviations from Hardy–Weinberg equilibrium of tetrodotoxin-resistance alleles in garter snakes (Thamnophis sirtalis)
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Biohybrid hand actuated by multiple human muscle tissues
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Mechanical loading induces the longitudinal growth of muscle fibers via a rapamycin-insensitive mechanism
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Diverse musculature layers in three species of octopus support precise motor control yet lack smooth muscle.
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Simple muscle-lever systems are not so simple: The need for dynamic analyses to predict lever mechanics that maximize speed
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Tetanus-driven biohybrid multi-joint robots powered by muscle rings with enhanced contractile force
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Data from: Tuning of feedforward control enables stable muscle force-length dynamics after loss of autogenic proprioceptive feedback
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Hindlimb muscle spindles inform preparatory forelimb coordination prior to landing in toads
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Fig. 5. Correlation between the fibers diameters and body weight from 300 in Morphological and morphometric analysis of skeletal muscle between male and female young adult Colossoma macropomum (Characiformes: Serrasalmidae)
Fig. 5. Correlation between the fibers diameters and body weight from 300 days old Colossoma macropomum. The fibers diameters are showed by class: circle (<20 µm), triangle (20 to 50 µm) and square (>50 µm).
Fig. 1 in Morphological and morphometric analysis of skeletal muscle between male and female young adult Colossoma macropomum (Characiformes: Serrasalmidae)
Fig. 1. Muscle tissue organization in Colossoma macropomum. A. Multinucleated fibers with peripheral nuclei (arrow). Longitudinal section. HE. (Bar = 25 μm). B. Nuclei located at the periphery of the muscle fiber (arrow). Transverse section. HE. (Bar = 50 μm). C. Fascicle organized in perimysium and endomysium. Transverse section. HE. (Bar = 100 μm). D. Connective tissue surrounding the endomysium (dotted arrow) and perimysium (black arrow). Transverse section. Masson trichrome. (Bar = 50 μm). E. Mobilization of cells in the muscle fiber insertion in connective tissue (black arrow), many nuclei are observed. Longitudinal section. HE. (Bar = 50 μm). F. Sarcomere with striations along the muscle fiber. Longitudinal section. HE. (Bar = 25 μm).
Fig. 4 in Morphological and morphometric analysis of skeletal muscle between male and female young adult Colossoma macropomum (Characiformes: Serrasalmidae)
Fig. 4. Frequency of muscle fibers from 300 days old Colossoma macropomum. Significant differences (*) represent the differences between the animal groups according to body weight, 165 to 300 g (black) and 976 to 1,250 g (gray) in each class by ANOVA one-way supplemented by Tukey's test (P<0.05).
Fig. 3. A in Morphological and morphometric analysis of skeletal muscle between male and female young adult Colossoma macropomum (Characiformes: Serrasalmidae)
Fig. 3. A. Cellular apoptosis (black arrow). Transverse section. Masson trichrome. (Bar = 25 μm). B. Detail of the nerve (black circle). Transverse section. Masson trichrome. (Bar = 50 μm).
Database for Study: Shear-wave elastography for assessment of trapezius muscle stiffness: reliability and association with low-level muscle activity
<p>This is the database for the study entitled <strong>Shear-wave elastography for assessment of trapezius muscle stiffness: reliability and association with low-level muscle activity. </strong>In this study, we explored the reliability of shear-wave elastography for assessment of the trapezius muscle stiffness and its relationship with low-level muscle activity.Twenty participants were included in a two-session experiment. Measurements of shear modulus and muscle activity were performed at rest and during low-level activity, induced by shoulder abduction without additional external resistance. Good to excellent intra-session repeatability (ICC > 0.80) and moderate inter-rater and inter-session reproducibility (ICC = 0.66-0.74) were observed. Typical errors were acceptable only for intra-session measurements in resting conditions. Inverse relationships between shear modulus and muscle activity at 40° and 60° of shoulder abduction (r = -0.53 and -0.57) were observed on a group level. We also found lower shear modulus in females, for perpendicular probe position and for the non-dominant side of the body. Previous studies have demonstrated positive within-individual relationships between muscle activity and shear modulus. Our results suggested that, at least when the activity levels are low, an inverse relationship exists between muscle activity and shear modulus on a group level, suggesting inherent passive stiffness could account for a larger portion of the variance (compared to muscle activity) in shear modulus when the muscle activity is low. Our results imply that shear-wave elastography can be used in research exploring muscle stiffness, however, caution is needed since only intra-session examination in resting conditions showed acceptable within-participant typical errors.</p>
Fractal analysis of muscle activity patterns during locomotion: pitfalls and how to avoid them
<p>Despite the lack of consensus on how to perform fractal analysis of physiological time series, many studies rely on this technique. Here, we shed light on the potential pitfalls of using the Higuchi’s fractal dimension (HFD) and the Hurst exponent (H). We expose and suggest how to solve the drawbacks of such methods when applied to data from normal and perturbed locomotion by combining <em>in vivo</em> recordings and computational approaches.</p> <p>In this supplementary data set we made available: a) the metadata file “metadata.dat”; b) the baseline signals file “baseline_data.RData”; c) the R script “fractal_analysis.R” to calculate the H and HFD of the baseline data and produce the log-log plots. Explanatory comments are profusely present throughout the script and in the metadata file.</p>
Time Course of Recovery for Performance Attributes and Circulating Markers of Muscle Damage Following a Rugby Union Match in Amateur Athletes
<p>Supplemental file 1 - Raw data associated with article titled "Time Course of Recovery for Performance Attributes and Circulating Markers of Muscle Damage Following a Rugby Union Match in Amateur Athletes" in MDPI's journal <em>Sports</em></p>
Figure 5. Muscle mass reconstruction method for M in A Computational Analysis of Limb and Body Dimensions in Tyrannosaurus rex with Implications for Locomotion, Ontogeny, and Growth
Figure 5. Muscle mass reconstruction method for M. caudofemoralis longus (see Methods); Carnegie specimen depicted. Dorsal and right lateral views are shown on topı and in the bottom row are caudal views of the right femur and then caudal vertebrae (8th and 17th). Red shaded volumes are the M. caudofemoralis longus reconstruction. Note a small space for M. caudofemoralis brevis (not reconstructed) is left around the ilium/sacrum and lateral to the CFL insertion. doi:10.1371/journal.pone.0026037.g005
Data from: Cold-acclimation increases depolarization resistance and tolerance in muscle fibers from a chill-susceptible insect, Locusta migratoria
<p>Cold exposure depolarizes cells in insects due to a reduced electrogenic ion transport and a gradual increase in extracellular [K<sup>+</sup>]. Cold-induced depolarization is linked to cold injury in chill-susceptible insects, and the locust, <i>Locusta migratoria</i>, has shown improved cold tolerance following cold-acclimation through depolarization resistance. Here we investigate how cold-acclimation influences depolarization resistance and how this resistance relates to improved cold tolerance. To address this question, we investigated if cold-acclimation affects the electrogenic transport capacity and/or the relative K<sup>+</sup> permeability during cold exposure by measuring membrane potentials of warm- and cold-acclimated locusts in the presence/absence of ouabain (Na<sup>+</sup>/K<sup>+</sup> pump blocker) or 4-aminopyridine (4-AP, voltage-gated K<sup>+</sup> channel blocker). In addition, we compared the membrane lipid composition of muscle tissue from warm- and cold-acclimated locust, and the abundance of a range transcripts related to ion transport and cell injury accumulation. We found that cold-acclimated locusts are depolarization resistant due to an elevated K<sup>+</sup> permeability, facilitated by opening of 4-AP sensitive K<sup>+</sup> channels. In accordance, cold-acclimation was associated with an increased abundance of <i>shaker</i> transcripts (gene encoding 4-AP sensitive voltage-gated K<sup>+</sup> channels). Furthermore, we found that cold-acclimation improved muscle cell viability following exposure to cold and hyperkalemia even when muscles were depolarized substantially. Thus, cold-acclimation confers resistance to depolarization by altering the relative ion permeability, but cold-acclimated locusts are also more tolerant to depolarization.</p>
Muscle MRI in two SMA patients on nusinersen treatment: A two years follow-up
<p><strong>Introduction: </strong>The effects of nusinersen in adults with SMA rely on neuromotor function scales and qualitative assessments. There are limited clinical or imaging data on muscle changes over time.</p> <p><strong>Methods: </strong>Two adult SMA patients underwent clinical assessments including measures of upper and lower limb function with Revised Upper Limb Module (RULM) and Hammersmith Function Motor Scale Expanded (HFMSE); both patients were also studied with whole-body muscle MRI (T1-weighted and Diffusion Tensor Imaging/DTI sequences), at baseline and after 10 and 24 months from the beginning of treatment with nusinersen.</p> <p><strong>Results: </strong>After two years of treatment, HFMSE and RULM scores were stable in both patients. DTI sequences revealed an increased number, length and organization of muscle fiber tracks, and Fractional Anisotropy (FA) values showed a significant reduction after 10 and 24 months from baseline, in their corresponding maps.</p> <p><strong>Discussion: </strong>Muscle DTI imaging seems to play an interesting role to monitor treatment effects over time in adult SMA patients.</p>
Drop vertical jump biomechanics following exercise induced muscle damage
<p>Drop vertical jump biomechanical data 0h and 48h following eccentric exercise induced muscle damage of the knee extensors.</p>
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.