The postnatal development of some twitch and fatigue properties of single motor units in the ankle muscles of the kitten.

Acta Physiologica Scandinavica
C Hammarberg, J O Kellerth

Abstract

Contractions of single motor units in the gastrocnemius, soleus and pretibial flexor muscles were elicited by intracellular stimulation of the innervating motoneurones. Kittens being 1, 2, 6 and 10 weeks of age were used. The aim was to establish the pattern of postnatal differentiation of the adult motor unit types (Burke et al. 1973, 1974, Hammarberg and Kellerth 1975 b). In the developing type S units of the soleus muscle the mean value for contraction time showed a transient decrease during the early postnatal period, but the twitch half-relaxation time (HRT), the duration of motoneurone post-spike afterhyperpolarization (AHP) and the susceptibility to fatigue remained virtually unchanged during the age period studied. In the units of the developing fast twitch muscles the contraction time, HRT and susceptibility to fatigue were significantly different from those of the soleus units already at 1 week of age. At 6-10 weeks of age the contractile characteristics typical of the adult type FF and FR units were attained. The AHP duration gradually decreased up to 10 weeks of age, and it was then considerably shorter than both at 1 week of age and in the adult stage.

References

Nov 1, 1973·The Journal of Physiology·R E BurkeF E Zajac
Jul 1, 1967·The Journal of General Physiology·M Bárány
Jan 1, 1968·Acta Neurologica Scandinavica·B Nyström
Jan 1, 1971·Journal of Neurophysiology·C B Olson, C P Swett
Feb 1, 1973·The Journal of Physiology·J BagustR A Westerman
Sep 1, 1971·Acta Physiologica Scandinavica·J O KellerthS Skoglund
Jul 1, 1967·Quarterly Journal of Experimental Physiology and Cognate Medical Sciences·R M Ridge
Jun 1, 1968·Developmental Biology·W K Engel, G Karpati
Jan 1, 1953·Quarterly Journal of Experimental Physiology and Cognate Medical Sciences·G GORDON, C G PHILLIPS
Feb 1, 1960·The Journal of Physiology·A J BULLERR M ECCLES
Jul 9, 1960·Nature·S SKOGLUND
May 1, 1964·The Journal of General Physiology·F G STANDAERT

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Citations

Sep 1, 1985·Developmental Biology·H Gordon, D C Van Essen
Oct 1, 1988·Brain Research·W G Tatton, E Theriault
Oct 1, 1989·Brain Research. Developmental Brain Research·W E Cameron, H Fang
Oct 21, 1991·Brain Research. Developmental Brain Research·V Ramírez, B Ulfhake
May 26, 1995·Brain Research. Developmental Brain Research·I Eustache, J P Gueritaud
May 22, 1998·Neuroscience and Biobehavioral Reviews·D Kernell
Feb 1, 1994·Ergonomics·J H van Dieën, H H Oude Vrielink
Dec 22, 1991·The Journal of Comparative Neurology·W E CameronR D Guthrie
Sep 22, 2015·Frontiers in Cellular Neuroscience·Jacques DurandJean-Patrick Guéritaud
Oct 27, 2017·Journal of Neurophysiology·C Jean-XavierP J Whelan
Nov 1, 1988·The American Journal of Physiology·T P MartinV R Edgerton

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