Distribution of different fibre types in human skeletal muscles. 2. A study of cross-sections of whole m. vastus lateralis.
Distribution of different fibre types in human skeletal muscles. 2. A study of cross-sections of whole m. vastus lateralis.
复制标题
人体骨骼肌中不同纤维类型的分布。
DOI：
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发表时间：
1983
期刊：
影响因子：
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通讯作者：
M. Sjöström
中科院分区：
文献类型：
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作者：
J. Lexell;K. Henriksson;M. Sjöström
为了确定纤维的总数和不同纤维类型的相对出现在m内变化的程度。股外侧肌，制备15微米厚的整个肌肉的横截面。在每48平方毫米的截面中确定1型和2型纤维的总数，并且使用允许以等高线图的形式评估双变量数据的计算机程序来分析由此获得的结果。纤维总数在近端到远端的方向在同一肌肉和个体之间的变化。肌纤维平均面积与肌横截面积之间无明显相关性。1型纤维在整个肌肉中的比例在个体之间变化（从44%到57%），所有五个的平均值为52%。不同类型的纤维的分布在肌肉内变化，主要是作为深度的函数，在肌肉的表面和1型纤维在更深的区域中的2型纤维占优势。因此，以m为单位的纤维类型分布。股外侧肌不是随机的在将纤维类型组成的数据与功能变量进行比较时，必须考虑到这一点。
In order to determine the total number of fibres and the extent to which the relative occurrence of different fibre types varies within m. vastus lateralis, 15 micrometers thick cross-sections of whole muscles were prepared. The total number of type 1 and type 2 fibres was determined in every 48th square millimetre of the section, and the results thus obtained were analysed using a computer program allowing an assessment of bivariate data in the form of contour plots. The total number of fibres varied both in proximal to distal direction in the same muscle and between individuals. No obvious correlation existed between the mean fibre area and the muscle cross-sectional area. The proportion of type 1 fibres in the whole muscle varied between individuals (from 44% to 57%) with a mean value for all five of 52%. The distribution of different fibre types varied within the muscle, mainly as a function of depth, with a predominance to type 2 fibres at the surface and type 1 fibres in deeper regions of the muscle. Thus, the fibre type distribution in m. vastus lateralis is not random. This must be taken into consideration when data on fibre type composition are compared with functional variables.