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Muscle structural assembly and functional consequences.

Marco Narici1, Martino Franchi2, Constantinos Maganaris3

  • 1University of Nottingham, Division of Medical Sciences and Graduate Entry Medicine, School of Medicine, Faculty of Medicine and Health Sciences, MRC-ARUK Centre of Excellence for Musculoskeletal Ageing Research, Derby Royal Hospital, Derby DE22 3DT, UK marco.narici@nottingham.ac.uk.

The Journal of Experimental Biology
|January 22, 2016
PubMed
Summary
This summary is machine-generated.

Muscle structure and function are intricately linked, with recent technologies revealing how fascicle and sarcomere behavior influences force generation and adaptation. This research explores muscle remodeling and contraction-specific growth.

Keywords:
AtrophyHypertrophyMuscle contractionSarcopeniaSkeletal muscle

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Area of Science:

  • Muscle physiology
  • Biomechanics
  • Human movement science

Background:

  • The relationship between muscle structure and function has been studied since the Renaissance.
  • Early anatomical dissections and the scientific method established foundational knowledge.
  • Current understanding links muscle architecture and fiber properties to mechanical output.

Purpose of the Study:

  • To investigate in vivo human muscle fascicle and sarcomere behavior using advanced imaging techniques.
  • To identify optimal operating ranges for force development and real-life activities.
  • To understand muscle architecture's adaptation to loading, unloading, aging, and specific contraction modes.

Main Methods:

  • Utilizing laser diffraction, optical microendoscopy, and ultrasonography for in vivo human muscle analysis.
  • Examining muscle fascicle and sarcomere behavior across varying joint angles and contraction intensities.
  • Employing ultrasonography to study muscle remodeling in response to disuse atrophy, sarcopenia, and chronic loading.

Main Results:

  • Identified in vivo length-dependent force production regions for fascicles and sarcomeres.
  • Characterized fascicle and sarcomere operating ranges during activities like walking.
  • Revealed muscle architecture's adaptation to aging and unloading, identifying biomarkers for atrophy and sarcopenia.
  • Demonstrated that muscle hypertrophy patterns are dependent on contraction mode (eccentric vs. concentric).

Conclusions:

  • Advanced imaging technologies provide unprecedented insights into in vivo muscle mechanics and adaptation.
  • Muscle architecture significantly influences mechanical properties and adapts to various physiological stimuli.
  • Contraction mode plays a crucial role in the pattern of muscle hypertrophy and sarcomere arrangement.
  • Further research into the molecular mechanisms of contraction-specific muscle growth is warranted.