1979
DOI: 10.1007/bf00442345
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Metabolic substrates, muscle fibre composition and fibre size in late walking and normal children

Abstract: In 10 children with delayed walking, muscle specimens were obtained by needle biopsy from the vastus lateralis muscle for determination of ATP, creatine phosphate (CP), glycogen and lactate concentration, as well as fibre composition and fibre size. The values obtained are compared with corresponding results for a control group of 25 children aged 2 months--11 years. Details of the control series are given and its validity as a reference group is discussed. Six children (group I) who showed minor gross motor d… Show more

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Cited by 24 publications
(13 citation statements)
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“…Thus, a higher concentration of these compounds might indicate a better alactacid anaerobic capacity. The glycogen concentration in smaller children does not seem to be more markedly reduced as compared to adults (7,17). In the comparison between boys between 1 1 and 15 years of age slightly increasing values were found with increasing age (Fig.…”
mentioning
confidence: 76%
See 1 more Smart Citation
“…Thus, a higher concentration of these compounds might indicate a better alactacid anaerobic capacity. The glycogen concentration in smaller children does not seem to be more markedly reduced as compared to adults (7,17). In the comparison between boys between 1 1 and 15 years of age slightly increasing values were found with increasing age (Fig.…”
mentioning
confidence: 76%
“…The concentrations of ATP, CP and glycogen in small infants are somewhat lower than that found in adults (7,17). For practical reasons it has been very difficult to collect a sufficient amount of muscle biopsies from normal children of different ages.…”
mentioning
confidence: 99%
“…In a subsequent study, samples of muscle tissue of 6 idiopathic late walkers were analyzed. This small sample of idiopathic late walkers showed reduced muscle fi ber size, especially Type II fi bers, and lower concentrations of ATP, phosphocreatinine and glycogen compared to normal children of the same age who walk at the normally expected time [Lundberg, (1980);Lundberg et al, (1979a)]. These characteristics may be related to physical inactivity.…”
Section: Metabolic and Physiological Correlates Of Motor Developmentmentioning
confidence: 99%
“…The ratio of IIA-type and IIB-type fibers is also disputable (Colling-Saltin, 1980;du Plessis et al, 1985;Jansson, 1996). But, according to other authors, children until pubescence are more characterized by I type than adults (Eriksson & Saltin, 1974;Lexell et al, 1992;Lundberg et al, 1979). According to Jansson (1996), development of muscles from birth up to 35 years old for men corresponds to ∩-model: from birth up to 9 years old a substantial increase in percent of Itype fibers is observed, at the age of about 9 there is a maximum, whereupon their share is reduced considerably by 19 years old.…”
Section: Morpho-functional Changes Of Skeletal Muscles During Postnatmentioning
confidence: 95%