Kiessling K H, Kiessling A
Comp Biochem Physiol A Comp Physiol. 1984;77(1):75-8. doi: 10.1016/0300-9629(84)90014-8.
beta R fibres (type I) constitute less than 10% of the semimembranosus and longissimus dorsi muscles and about twice as much of the gluteobiceps and flexor hallucis. Except for longissimus dorsi, 50% or more consist of alpha W (type IIB) fibres--in semimembranous, as much as 70%. Despite the comparatively large content of alpha W fibres, both the oxidative capacity and the capacity to metabolize fatty acids is high. Furthermore, unexpectedly small differences in oxidative capacity between the three fibre types beta R, alpha R and alpha W (I, IIA and IIB) are revealed by histochemical staining. These results indicate a tendency to bring the three fibre types closer together as regards metabolic activities, as an adaptation to the relatively tranquil life of this animal. However, the large content of alpha W fibres does not accord well with this way of life, as they guarantee quick movements. The comparatively high oxidative capacity of the alpha W fibres in the Svalbard reindeer and the fact that during starvation it is primarily alpha W fibres that contribute to the energy supply by protein degradation may nevertheless account for their abundant occurrence.
βR纤维（I型）在半膜肌和背最长肌中占比不到10%，而在臀二头肌和拇长屈肌中约为其两倍。除背最长肌外，50%或更多由αW（IIB型）纤维组成——在半膜肌中高达70%。尽管αW纤维含量相对较高，但氧化能力和代谢脂肪酸的能力都很强。此外，通过组织化学染色发现，βR、αR和αW三种纤维类型（I、IIA和IIB）之间的氧化能力差异出乎意料地小。这些结果表明，作为对这种动物相对平静生活的一种适应，三种纤维类型在代谢活动方面有趋同的趋势。然而，αW纤维的大量存在与这种生活方式不太相符，因为它们确保快速运动。斯瓦尔巴德驯鹿中αW纤维相对较高的氧化能力，以及在饥饿期间主要是αW纤维通过蛋白质降解为能量供应做出贡献这一事实，可能解释了它们大量存在的原因。
