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Overview

muscle fibre

A subunit of a skeletal muscle comprising a single syncytial cell with peripheral nuclei and cytoplasm packed with myofibrils.

muscle fibre

muscle fibre   Quick reference

A Dictionary of Biomedicine (2 ed.)

Reference type:
Subject Reference
Current Version:
2019

...muscle fibre A subunit of a skeletal muscle comprising a single syncytial cell with peripheral nuclei and cytoplasm packed with myofibrils...

muscle fibre

muscle fibre   Quick reference

The Oxford Dictionary of Sports Science & Medicine (3 ed.)

Reference type:
Subject Reference
Current Version:
2007
Subject:
Science and technology, Medicine and health
Length:
210 words
Illustration(s):
1

... fibre In skeletal muscle, a single, multinucleated cell which appears banded or striated when viewed under a light microscope. A single muscle contains between 10 000 and 450 000 fibres. Each muscle fibre is less than 0.1 mm in diameter, but most extend the length of the muscle. This means that a fibre in the thigh may be more than 35 cm long. Several systems have been used to classify muscle fibre type, but most recognize three main types: two types of fast-twitch fibres (FT) and one type of slow-twitch fibre (ST). FT fibres can reach peak tension in...

muscle fibre types

muscle fibre types   Quick reference

Food and Fitness: A Dictionary of Diet and Exercise (2 ed.)

Reference type:
Subject Reference
Current Version:
2016

...of white, fast-twitch fibres, as the following table * shows: Muscle fibre types Average % Composition of Fibre Type in the Gastrocnemius Muscles of Elite Athletes Athlete Percentage of Fibres White (Slow-Twitch) Red (Fast-Twitch) sprinter 24 76 middle-distance runner 52 48 marathon runner 79 21 * Data from Costill, D. L., et al . (1976) Skeletal muscle enzymes and fiber composition in male and female track athletes. Journal of Applied Physiology . 40: 149–54. Although the proportion of the main fibre types is largely inherited, there is some...

muscle fibre type

muscle fibre type   Quick reference

A Dictionary of Sports Studies

Reference type:
Subject Reference
Current Version:
2010
Subject:
Social sciences, Society and culture
Length:
137 words

... fibre type The classification of muscle fibres according to their contractile and metabolic characteristics. The simplest classification is into slow-twitch (or type I) and fast-twitch (or type II) fibres although some classifications subdivide these two types further. Slow-twitch fibres generate energy mainly aerobically, shorten slowly, and are able to produce lesser force, but are fatigue-resistant. Fast-twitch fibres generate energy mainly anaerobically, shorten more quickly, and are able to produce greater force, but fatigue more rapidly. Muscles are...

muscle fibre

muscle fibre noun   Reference library

The Canadian Oxford Dictionary (2 ed.)

Reference type:
English Dictionary
Current Version:
2005
Subject:
English Dictionaries and Thesauri
Length:
16 words
muscle fibre

muscle fibre  

A subunit of a skeletal muscle comprising a single syncytial cell with peripheral nuclei and cytoplasm packed with myofibrils.
muscle fibre type

muscle fibre type  

Reference type:
Overview Page
The classification of muscle fibres according to their contractile and metabolic characteristics. The simplest classification is into slow-twitch (or type I) and fast-twitch (or type II) fibres ...
Sensibility

Sensibility   Reference library

An Oxford Companion to the Romantic Age

Reference type:
Subject Reference
Current Version:
2009
Subject:
History, modern history (1700 to 1945), Literature
Length:
7,039 words
Publisher:
Oxford University Press

...kind of consciousness, one that could be further sensitized in order to be more acutely responsive to signals from the outside environment and from inside the body. Auditors and readers initially relished and eventually took for granted the system betokened by the words ‘nerve’, ‘fibre’, ‘sensation’, ‘impression’, and, of course, ‘sensibility’. The flexibility of the term ‘sensibility’, synonymous with consciousness, with feelings, and eventually identifiable with sexual characteristics, generated a continuous struggle over its meanings and values. As the new...

Ia fibre

Ia fibre  

A large-diameter, thickly myelinated type of afferent nerve fibre with high conduction velocity, such as that innervating a muscle spindle. US Ia fiber. Compare alpha fibre, C fibre, delta fibre, ...
II fibre

II fibre  

A medium-diameter, partly myelinated type of afferent nerve fibre with intermediate conduction velocity, such as those of the sensory receptors located in the skin, extrafusal muscles, and joints. US ...
alpha fibre

alpha fibre  

A large-diameter, thickly myelinated type of efferent somatic nerve fibre, such as the fibre supplying a skeletal muscle, composed of alpha motor neurons and having high conduction velocity. US alpha ...
fast-twitch fibre

fast-twitch fibre  

A striped muscle fibre that responds quickly and powerfully but is more prone to fatigue than slow-twitch fibre. US fast-twitch fiber. See fast glycolytic fibre, fast oxidative glycolytic fibre.
slow-twitch fibre

slow-twitch fibre  

A dark-coloured striped muscle fibre, especially in muscles involved in standing and walking, that responds more slowly and is less prone to fatigue but capable of less powerful contractions than ...
gamma fibre

gamma fibre  

A medium-diameter partly myelinated type of efferent somatic nerve fibre, composed of gamma motor neurons and having intermediate conduction velocity. A typical example is a fibre supplying a muscle ...
recruitment

recruitment  

The enlistment of different numbers and types of muscle fibre during the contraction of a whole muscle. Recruitment follows a set pattern: slow-twitch fibres are brought into action first, then fast ...
physiological cross-sectional area

physiological cross-sectional area  

(PCSA)The area of a transverse section of muscle. When a muscle is tested physiologically in situ and then removed; PCSA = (muscle mass)(cosine theta)/(fibre length)(muscle density), where muscle ...
extrafusal fibre

extrafusal fibre  

A typical contractile muscle cell or muscle fibre that lies outside muscle spindles.
parallel fibre arrangement

parallel fibre arrangement  

Pattern of fibres within a muscle in which the fibres are roughly parallel to the longitudinal axis of the muscle. Muscles, such as the biceps brachii, with a parallel fibre arrangement are able to ...
capillary-to-fibre ratio

capillary-to-fibre ratio  

The number of capillaries to each muscle fibre. A high capillary-to-fibre ratio allows the blood to more fully perfuse muscle tissue. Trained athletes have a significantly higher capillary-to-fibre ...
pennate muscle

pennate muscle  

Flat muscle with fibres arranged around one or more central tendons like the barbs of a feather. Pennate muscles shorten only to a limited extent, but they can produce very powerful actions. Pennate ...

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