Motor unit organization of human medial gastrocnemius.
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TLDR
The results suggest that during slowly increasing voluntary contractions where units are recruited in order of size, type 1 and 2a muscle fibres would be employed at low force levels followed by type 2b Muscle fibres in stronger contractions.Abstract:
1. The properties of fifty-seven motor units in human medial gastrocnemius have been studied using controlled intramuscular microstimulation, glycogen depletion and muscle biopsy. 2. Motor units could be divided into three classes on the basis of their mechanical properties. Type S units were slow, small and fatigue resistant. Type FR units were fast, intermediate in size, and fatigue resistant. Type FF units were fast, large and fatigable. 3. Glycogen depletion of a number of type S and FF units revealed them to be composed of type 1 and type 2b muscle fibres respectively. 4. The results suggest that during slowly increasing voluntary contractions where units are recruited in order of size, type 1 and 2a muscle fibres would be employed at low force levels followed by type 2b muscle fibres in stronger contractions.read more
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References
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Journal ArticleDOI
Physiological types and histochemical profiles in motor units of the cat gastrocnemius.
TL;DR: Intracellular stimulation of individual motoneurones ensured functional isolation of the muscle units innervated by them in pentobarbitone‐anaesthetized cats.
Journal ArticleDOI
The specificity of the histochemical method for adenosine triphosphatase.
Helen A. Padykula,Edith Herman +1 more
TL;DR: The strong phosphatase activity of endothelium and vascular smooth muscle toward adenosine triphosphate was seemingly indifferent to -SH groups, since the staining of these structures was not markedly influenced by -SH inhibitors or compounds.
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Histological demonstration of mucin after periodic acid.
TL;DR: The histological demonstration of mucin by Schiff's reagent following the action of periodic acid is described, as for the Feulgen's test.
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The orderly recruitment of human motor units during voluntary isometric contractions
TL;DR: The contractile properties of human motor units from the first dorsal interosseus muscle of the hand were studied during voluntary isometric contractions using recently developed techniques.
Journal ArticleDOI
Ballistic contractions in man: characteristic recruitment pattern of single motor units of the tibialis anterior muscle.
TL;DR: A new method is described for estimating ballistic force threshold of single motor units and ballistic contractions are graded in force both by the recruitment of additional motor units in stronger contractions, and by an increase in their rate of firing.