Rivero J L, Galisteo A M, Agüera E, Miró F
Department of Comparative Anatomy and Pathological Anatomy, Faculty of Veterinary Sciences, University of Córdoba.
Res Vet Sci. 1993 Mar;54(2):160-9. doi: 10.1016/0034-5288(93)90051-g.
Muscle biopsies were taken from the middle gluteal muscle of 143 untrained horses (83 Andalusians [AN] and 60 Arabians [AR]) ranging from 10 days to 24 years old. The horses were separated according to breed and sex and allotted to five age groups: A, 0 to three months; B, yearlings; C, two to three years; D, five to 10 years; and E, 11 to 24 years. There was an increase in the percentage of type I fibres (about 100 per cent) as well as a decrease in the percentage of type IIB fibres (AN, 50 per cent; AR, 40 per cent) over the five age groups. The percentage of type IIA fibres rose significantly over the first two or three age groups. The overall decrease in the subgroup IIB fibres with age was proportionally greater for IIB oxidative fibres (AN, 72 per cent; AR, 68 per cent) than for IIB non-oxidative fibres (AN, 5 per cent; AR, 34 per cent). The mean cross-sectional area of all three fibre types increased significantly with age. In any given age group, the mean relative cross-sectional area occupied by IIA fibres in the biopsy specimens was significantly greater in stallions than in mares, at the expense of IIB fibres.
从143匹未经训练的马（83匹安达卢西亚马[AN]和60匹阿拉伯马[AR]）的臀中肌采集肌肉活检样本，这些马的年龄从10天到24岁不等。根据品种和性别对马进行分组，并分配到五个年龄组：A组，0至3个月；B组，一岁马；C组，2至3岁；D组，5至10岁；E组，11至24岁。在这五个年龄组中，I型纤维的百分比增加（约100%），IIB型纤维的百分比下降（安达卢西亚马为50%；阿拉伯马为40%）。IIA型纤维的百分比在前两个或三个年龄组中显著上升。随着年龄增长，IIB亚组纤维的总体减少在IIB氧化纤维（安达卢西亚马为72%；阿拉伯马为68%）中比在IIB非氧化纤维（安达卢西亚马为5%；阿拉伯马为34%）中比例更大。所有三种纤维类型的平均横截面积均随年龄显著增加。在任何给定年龄组中，活检样本中IIA型纤维所占的平均相对横截面积在种马中显著大于母马，而以IIB型纤维为代价。
