Data on fibre size in thirty-six human muscles: An autopsy study
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A potent physiological method to magnify and sustain soleus oxidative metabolism improves glucose and lipid regulation
2022, iScienceCitation Excerpt :Second, slow oxidative muscle has multiple intrinsic molecular and phenotypic features favoring specialization in prolonged contractile activity, in part because of the capacity for using more blood-borne fuels and hypothetically less glycogen in some physiological conditions; this is supported by animal (Bey and Hamilton, 2003; Cartee et al., 2016; Deshmukh et al., 2021; Halseth et al., 1998; James et al., 1985; Mackie et al., 1980; McDonough et al., 2005; Terry et al., 2018) and human (Deshmukh et al., 2021; Gollnick et al., 1974a, 1974b; Jensen et al., 2012; Johnson et al., 1973; Murgia et al., 2021) studies that have long described the heterogeneous qualities between different fiber types within a muscle and between different muscles. The soleus has a greater predominance of slow-oxidative fibers (∼88% of the soleus mass is type I slow-twitch fibers) than 36 other human muscles that have also been fiber typed (Johnson et al., 1973). The soleus is a slow-twitch postural muscle that has motor neurons and other features favoring a lower threshold of effort needed to recruit it for more time and intensity than other limb muscles (Hodgson et al., 2005; Monster et al., 1978).
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2020, Molecular MetabolismCitation Excerpt :A schematic overview of the workflow for the sample preparation is shown in Figure 1B. By infiltrating the muscle tissue with sucrose and embedding it in gelatin, we succeeded in cutting 70 nm sections from the biopsies. For reference, conventional muscle cryo-sections are ∼7 μm and isolated human muscle fibers vary in thickness from 40 to 80 μm [19]. Thus, this approach effectively improved the Z-plane resolution by almost 1 order of magnitude compared to the ∼600 nm resolution limit of confocal microscopy [20,21].
Characterisation of flexor digitorum profundus, flexor digitorum superficialis and extensor digitorum communis by electrophoresis and immunohistochemical analysis of myosin heavy chain isoforms in older men
2020, Annals of AnatomyCitation Excerpt :It seems that contraction velocity is more extensively fine-tuned in fast than in slow fibers. Previous studies of extrinsic finger muscles described the composition of FDP and EDC based on myofibrillar ATPase histochemistry in six young subjects, but did not investigate FDS (Johnson et al., 1973; Polgar et al., 1973). They reported on similar proportions of slow type-1 fibers in EDC and FDP (approximately 47%), which is in contrast to the difference between EDC and FDP observed in the present study.