Skeletal muscle, in addition to being comprised of a heterogeneous muscle fiber population, also includes extracellular components that do not contribute to positive tensional force production. Here we test segmental bioelectrical impedance spectroscopy (S-BIS) to assess muscle intracellular mass and composition. S-BIS can evaluate electrical properties that may be related to muscle force produ...

Mathematical models of left ventricular (LV) wall mechanics show that fiber stress depends heavily on the choice of muscle fiber orientation in the wall. This finding brought us to the hypothesis that fiber orientation may be such that mechanical load in the wall is homogeneous. Aim of this study was to use the hypothesis to compute a distribution of fiber orientation within the wall. In a fini...

BACKGROUND AND PURPOSE The active force generated by a single muscle fiber is greatest in midrange. In healthy subjects, the reduced muscle force at short muscle length is partially compensated by modified patterns of muscle activation, probably central in origin. These patterns are presumed to be deficient after stroke. We examined the excitability muscle-length relation in stroke patients and...

The sliding filament and cross-bridge theories of muscle contraction provide discrete predictions of the tetanic force-length relationship of skeletal muscle that have been tested experimentally. The active force generated by a maximally activated single fiber (with sarcomere length control) is maximal when the filament overlap is optimized and is proportionally decreased when overlap is dimini...

introduction: ursolic acid (ua) is a lipophilic triterpenoid compound, found in large amounts in apple peel. anabolic effects of ua on the skeletal muscle and the role of this tissue as a key regulator of systematic aging aroused this question in mind whether ua might amend skeletal muscle performances such as myoglobin expression and also whether it switches skeletal muscle fibers from glycoly...

Introduction: Recent studies employing diffusion MRI to characterize skeletal muscle and perform muscle fiber tractography have shown the need to minimize fiber directional uncertainty [1]. Dominated by the inherently low SNR of muscle diffusion MRI and the low anisotropy of muscle fibers, Monte Carlo studies suggest that tensor orientation estimates may vary up to 10% in a typical DTI experime...

Abstract Flexible sensors in wearable electronics have become increasingly multifunctional due to the development of materials synthesis and structure design. In particular, structural design can not only add capabilities fabricated from existing available normal materials, but also offer opportunities for fabrication with certain desired functions. Here, we designed a series fiber-junction mod...

The new optimization method for fiber orientation angle optimization of symmetrical multilayer plates like plywood is proposed. Optimization method consists of seeking for minimal compliance by choosing appropriate fiber orientation angle in outer layers of flexural plate. The discrete values of fiber orientation angles are used in method. Optimization results of simply supported plate and mult...