Abstract
Isometric twitch contractions have been studied in extensor hallucis brevis muscles of 32 healthy male subjects aged between 3 and 25 years. The maximum twitch tensions were found to increase gradually with age and then to undergo marked enhancement at puberty. After puberty little further change occurred. In the youngest children examined the twitch contraction times were already within the adult range, though the half-relaxation times were prolonged.
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Selected References
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- BULLER A. J., ECCLES J. C., ECCLES R. M. Differentiation of fast and slow muscles in the cat hind limb. J Physiol. 1960 Feb;150:399–416. doi: 10.1113/jphysiol.1960.sp006394. [DOI] [PMC free article] [PubMed] [Google Scholar]
- GOLDSPINK G. CYTOLOGICAL BASIS OF DECREASE IN MUSCLE STRENGTH DURING STARVATION. Am J Physiol. 1965 Jul;209:100–104. doi: 10.1152/ajplegacy.1965.209.1.100. [DOI] [PubMed] [Google Scholar]
- Galavazi G., Szirmai J. A. Cytomorphometry of skeletal muscle: the influence of age and testosterone on the rat m. levator ani. Z Zellforsch Mikrosk Anat. 1971;121(4):507–530. doi: 10.1007/BF00560157. [DOI] [PubMed] [Google Scholar]
- Gori Z., Pellegrino C., Pollera M. The hypertrophy of levator ani muscle of rat induced by testosterone: an electron microscope study. Exp Mol Pathol. 1969 Apr;10(2):199–218. doi: 10.1016/0014-4800(69)90040-9. [DOI] [PubMed] [Google Scholar]
- McComas A. J., Sica R. E., Currie S. An electrophysiological study of Duchenne dystrophy. J Neurol Neurosurg Psychiatry. 1971 Aug;34(4):461–468. doi: 10.1136/jnnp.34.4.461. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Sica R. E., McComas A. J. Fast and slow twitch units in a human muscle. J Neurol Neurosurg Psychiatry. 1971 Apr;34(2):113–120. doi: 10.1136/jnnp.34.2.113. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Venable J. H. Constant cell populations in normal, testosterone-deprived and testosterone-stimulated levator ani muscles. Am J Anat. 1966 Sep;119(2):263–270. doi: 10.1002/aja.1001190205. [DOI] [PubMed] [Google Scholar]
- Venable J. H. Morphology of the cells of normal, testosterone-deprived and testosterone-stimulated levator ani muscles. Am J Anat. 1966 Sep;119(2):271–301. doi: 10.1002/aja.1001190206. [DOI] [PubMed] [Google Scholar]
- Wieland R. G., Chen J. C., Zorn E. M., Hallberg M. C. Correlation of growth, pubertal staging, growth hormone, gonadotropins, and testosterone levels during the pubertal growth spurt in males. J Pediatr. 1971 Dec;79(6):999–1002. doi: 10.1016/s0022-3476(71)80197-x. [DOI] [PubMed] [Google Scholar]